Journal articles: 'Enhanced Heat Resistance'

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Krivenko, Pavel V., and Sergey G. Guziy. "Aluminosilicate coatings with enhanced heat- and corrosion resistance." Applied Clay Science 73 (March 2013): 65–70. http://dx.doi.org/10.1016/j.clay.2012.10.010.

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Krzemińska, Sylwia, Agnieszka Greszta, and Pamela Miśkiewicz. "Characterization of Heat Protective Aerogel-Enhanced Textile Packages." International Journal of Heat and Technology 38, no. 3 (October 15, 2020): 659–72. http://dx.doi.org/10.18280/ijht.380310.

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The aim of this study was to investigate the effects of aerogel application on the thermal properties of textile packages intended for use in protective clothing. The packages were prepared in the form of removable inserts filled with aerogel, differing in terms of fabric and design. The developed packages were tested for resistance to the three major types of heat: radiant, convective, and contact. The package variant with superior thermal performance was also evaluated for water vapor resistance. The package after incorporation of aerogel was found to approximately double radiant and convective heat resistance, with an approx. eightfold improvement for contact heat at the highest test temperature 250℃. Threshold time increased from (17.7±0.7) s to (139.9±4.9) s for the optimum aerogel-enhanced package variant with the greatest number of pouches, which met the criteria of the highest performance level. The thermal conductivity and thermal resistance of three fabrics selected for testing were tested in order to determine their basic thermal insulation properties. In general, packages containing a larger number of narrower pouches exhibited higher thermal protective performance. The results show that the developed textile packages with aerogel can be successfully used in thermal protective clothing.

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Byun, Sungjoon, Seounghwan Hyeon, and Kwan-Soo Lee. "Guide Vane for Thermal Enhancement of a LED Heat Sink." Energies 15, no. 7 (March 28, 2022): 2488. http://dx.doi.org/10.3390/en15072488.

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A guide vane was installed on a heat sink to enhance the cooling effect of light-emitting diode (LED) lights. The validity of the numerical analysis was verified against the experimental results and the result of the previous studies. The effect of the guide vane on the heat dissipation performance of the heat sink was identified. The effect of the guide vane on the heat sink was qualitatively studied using the streamline and temperature contour. The cooling effect of the heat sink was enhanced by increased air supplement to the center-bottom part. A parametric study was conducted to determine the thermal resistance according to the guide vane angle, installation height, and vane length. Optimization was performed to minimize the thermal resistance using the Kriging model and micro-genetic algorithm (MGA). The cooling performance of the heat sink was enhanced by a maximum of 17.2% when the guide vane was installed.

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Gevorgian, Gor A., Roman A. Vorobyev, German V. Pachurin, Alexey A. Filippov, Mariya V. Mukhina, and Zhanna V. Chaikina. "Optimization of Heat Treatment of Steel with Enhanced Thermal Resistance." Key Engineering Materials 839 (April 2020): 68–72. http://dx.doi.org/10.4028/www.scientific.net/kem.839.68.

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The work is dedicated to the development of the optimal technological process for the manufacture of hot stamping dies and die casting molds made of steel grade 4X5MF1С, in order to ensure the required performance characteristics. The mode of hardening heat treatment of this steel grade was established, which allows to recommend it as a heat-resistant structural material for metal products with the required yield strength σ0.2 within 750 to 1000 MPa.

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LEENANON, B., and M. A. DRAKE. "Acid Stress, Starvation, and Cold Stress Affect Poststress Behavior of Escherichia coli O157:H7 and Nonpathogenic Escherichia coli†." Journal of Food Protection 64, no. 7 (July 1, 2001): 970–74. http://dx.doi.org/10.4315/0362-028x-64.7.970.

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The effects of acid shock, acid adaptation, starvation, and cold stress of Escherichia coli O157:H7 (ATCC 43895), an rpo S mutant (FRIK 816-3), and nonpathogenic E. coli (ATCC 25922) on poststress heat resistance and freeze–thaw resistance were investigated. Following stress, heat tolerance at 56°C and freeze–thaw resistance at −20 to 21°C were determined. Heat and freeze–thaw resistance of E. coli O157:H7 and nonpathogenic E. coli was enhanced after acid adaptation and starvation. Following cold stress, heat resistance of E. coli O157:H7 and nonpathogenic E. coli was decreased, while freeze–thaw resistance was increased. Heat and freeze–thaw resistance of the rpoS mutant was enhanced only after acid adaptation. Increased or decreased tolerance of acid-adapted, starved, or cold-stressed E. coli O157:H7 cells to heat or freeze–thaw processes should be considered when processing minimally processed or extended shelf-life foods.

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Zeng, Ximin, Devarshi Ardeshna, and Jun Lin. "Heat Shock-Enhanced Conjugation Efficiency in Standard Campylobacter jejuni Strains." Applied and Environmental Microbiology 81, no. 13 (April 24, 2015): 4546–52. http://dx.doi.org/10.1128/aem.00346-15.

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ABSTRACTCampylobacter jejuni, the leading bacterial cause of human gastroenteritis in the United States, displays significant strain diversity due to horizontal gene transfer. Conjugation is an important horizontal gene transfer mechanism contributing to the evolution of bacterial pathogenesis and antimicrobial resistance. It has been observed that heat shock could increase transformation efficiency in some bacteria. In this study, the effect of heat shock onC. jejuniconjugation efficiency and the underlying mechanisms were examined. With a modifiedEscherichia colidonor strain, differentC. jejunirecipient strains displayed significant variation in conjugation efficiency ranging from 6.2 × 10−8to 6.0 × 10−3CFU per recipient cell. Despite reduced viability, heat shock of standardC. jejuniNCTC 11168 and 81-176 strains (e.g., 48 to 54°C for 30 to 60 min) could dramatically enhanceC. jejuniconjugation efficiency up to 1,000-fold. The phenotype of the heat shock-enhanced conjugation inC. jejunirecipient cells could be sustained for at least 9 h. Filtered supernatant from the heat shock-treatedC. jejunicells could not enhance conjugation efficiency, which suggests that the enhanced conjugation efficiency is independent of secreted substances. Mutagenesis analysis indicated that the clustered regularly interspaced short palindromic repeats system and the selected restriction-modification systems (Cj0030/Cj0031, Cj0139/Cj0140, Cj0690c, and HsdR) were dispensable for heat shock-enhanced conjugation inC. jejuni. Taking all results together, this study demonstrated a heat shock-enhanced conjugation efficiency in standardC. jejunistrains, leading to an optimized conjugation protocol for molecular manipulation of this organism. The findings from this study also represent a significant step toward elucidation of the molecular mechanism of conjugative gene transfer inC. jejuni.

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Wang, Shicheng, Chenyi Xu, Wei Liu, and Zhichun Liu. "Numerical Study on Heat Transfer Performance in Packed Bed." Energies 12, no. 3 (January 28, 2019): 414. http://dx.doi.org/10.3390/en12030414.

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Packed beds are widely used in industries and it is of great significance to enhance the heat transfer between gas and solid states inside the bed. In this paper, numerical simulation method is adopted to investigate the heat transfer principle in the bed at particle scale, and to develop the direct enhanced heat transfer methods in packed beds. The gas is treated as continuous phase and solved by Computational Fluid Dynamics (CFD), while the particles are treated as discrete phase and solved by the Discrete Element Method (DEM); taking entransy dissipation to evaluate the heat transfer process. Considering the overall performance and entransy dissipation, the results show that, compared with the uniform particle size distribution, radial distribution of multiparticle size can effectively improve the heat transfer performance because it optimizes the velocity and temperature field, reduces the equivalent thermal resistance of convection heat transfer process, and the temperature of outlet gas increases significantly, which indicates the heat quality of the gas has been greatly improved. The increase in distribution thickness obviously enhances heat transfer performance without reducing the equivalent thermal resistance in the bed. The result is of great importance for guiding practical engineering applications.

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BANG, W., and M. A. DRAKE. "Resistance of Cold- and Starvation-Stressed Vibrio vulnificus to Heat and Freeze-Thaw Exposure." Journal of Food Protection 65, no. 6 (June 1, 2002): 975–80. http://dx.doi.org/10.4315/0362-028x-65.6.975.

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The effects of cold storage and starvation on the subsequent heat resistance and freeze-thaw resistance of Vibrio vulnificus were studied. Three strains of V. vulnificus were evaluated. Cold stress had no effect on freeze-thaw resistance (P > 0.05). Starvation enhanced freeze-thaw resistance for one strain compared to controls (P < 0.05). V. vulnificus was not heat resistant; control populations were inactivated within 12 min at 47°C. Starvation increased heat tolerance for one strain, but differences were small from a processing perspective (P < 0.05). Cold stress had no effect on heat resistance (P > 0.05). Cold adaptation (holding 4 h at 15°C) enhanced cold temperature (5°C) tolerance. This information will be helpful in the development of methods to minimize V. vulnificus risk.

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Nguyen Tan Luon, Bao Phan Le, Do Nguyen Hoang Nga, Assoc Prof Dr Phong Mai Thanh, Assoc Prof Dr Thang Le Van, Assoc Prof Dr Kien Le Anh, and Assoc Prof Dr Phung Le Thi Kim. "Enhanced flame resistance of cellulose aerogel by ammonium polyphosphate for heat insulation." Journal of Military Science and Technology, VITTEP (December 20, 2022): 15–22. http://dx.doi.org/10.54939/1859-1043.j.mst.vittep.2022.15-22.

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Cellulose aerogels are a potential candidate for heat insulation, but one of their drawbacks is high flammability hindering their applications in practice. This study synthesized cellulose aerogels from microfibrillated cellulose fibers (MFC) extracted from discarded pineapple leaves. The procedure started with simply mixing the extracted fibers with polyamide amine-epichlorohydrin (PAE) as a chemical crosslinker and ammonium polyphosphate (APP) (10-20%) as a green and effectively flame-resistant additive, followed by freeze-drying. The produced aerogels are characterized in terms of their morphology, thermal stability and conductivity, and flame resistance via advanced and standardized methodologies including Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), thermal conductivity measurement by a heat flow meter, and UL94 horizontal burning test. The flame-resistant cellulose aerogels exhibit ultra-low density (25.5-26.8 mg/cm3), high porosity (98.0-98.2%), excellent heat insulation (35.9-36.7 mW/m۰K), and are completely flame-resistant. In addition, the varied APP content (10-20%) shows little effect on the density, heat conductivity, and thermal stability of the flame-resistant cellulose aerogels in comparison with that of the neat cellulose aerogel. Based on the findings, the synthesized flame-resistant cellulose aerogels are considered a promising bio-based heat insulation material.

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Ágoston, R., Cs Mohácsi-Farkas, and S. Pillai. "Exposure to sub-lethal temperatures induces enhanced heat resistance inListeria monocytogenes." Acta Alimentaria 39, no. 3 (September 2010): 327–36. http://dx.doi.org/10.1556/aalim.39.2010.3.9.

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11

Fujioka, Takahiro, and Long D. Nghiem. "Modification of a polyamide reverse osmosis membrane by heat treatment for enhanced fouling resistance." Water Supply 13, no. 6 (September 12, 2013): 1553–59. http://dx.doi.org/10.2166/ws.2013.164.

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The use of heat treatment to improve solute rejection and fouling resistance of a polyamide reverse osmosis (RO) membrane was investigated in this study. Heat treatment was carried out by immersing the membrane samples in Milli-Q water at 70 °C for a specific duration. Heat treatment (24 h) reduced the pure water permeability from 4.1 to 2.8 L/m2hbar but improved conductivity rejection from 95.5 to 97.0%. As a result, a correlation was observed between changes in the two parameters. Marginal changes in the membrane surface characteristics (i.e. zeta potential, hydrophobicity, chemistry and roughness) were observed as a result of heat treatment. Heat treatment significantly improved the fouling resistance property of the RO membrane. When the secondary effluent was filtrated at an elevated permeated flux, the virgin RO membrane exhibited 30% flux decline while the heat-treated membrane showed only 12% flux decline. This is possibly because heat treatment resulted in a denser cross-linked active skin layer, thus reducing the blockage caused by small organic foulants.

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Zhao, Chen Hong, and Yong Gang Lei. "Numerical Simulation of Heat Transfer Enhanced Tube Inserted Delta-Wing." Applied Mechanics and Materials 535 (February 2014): 66–70. http://dx.doi.org/10.4028/www.scientific.net/amm.535.66.

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Heat transfer and resistance characteristics of a tube inserted delta-winglet (inclination angle is 10 °) are studied by numerical simulation. The results show that the delta-winglet enhance the heat transfer of the enhancement tube inserted delta-winglet and improve the PEC with modest pressure drop penalties. Compared with based tubes, the delta-wings structure enhance the heat transfer 19.52%-31%.

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He, Zhan Shu, Xiao Long Liu, and Xue Fei Yang. "Research Progress of Three Kinds of Enhanced Heat Transfer Structures." Advanced Materials Research 711 (June 2013): 219–22. http://dx.doi.org/10.4028/www.scientific.net/amr.711.219.

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In order to transfer heat as much as possible through a unit area in unit time, this paper introduces three enhanced heat transfer structures, namely microchannel, open-celled metal foam and open-celled sintered porous metal. From two aspects of the heat transfer performance and the flow resistance, this paper reviews their research progress. Among three kinds of enhanced heat transfer structures, open-celled sintered porous metal has the best heat transfer performance, followed by open-celled metal foam and micro-channel. While, the sequence of the pressure drop of three kinds of enhanced heat transfer structures is in the reverse order. Thus, Enhanced heat transfer Structures with good heat transfer performance and small pressure drop are the future research direction.

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Qawasmeh, Bashar R., Mohammad Alrbai, and Sameer Al-Dahidi. "Forced convection heat transfer of Casson fluid in non-Darcy porous media." Advances in Mechanical Engineering 11, no. 1 (January 2019): 168781401881990. http://dx.doi.org/10.1177/1687814018819906.

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Forced convection of non-Newtonian Casson fluid laminar boundary layer flow past an isothermal horizontal flat plate in non-Darcy porous media is studied using Darcy–Forchheimer–Brinkman model. Similarity variables are used to transform the boundary layer equations. The boundary layer equations are reduced into system of first-order differential equations using similarity method. Then, solved numerically using adaptive Runge–Kutta–Fehlberg scheme simultaneously with shooting technique. The effects of Casson parameter, porosity, first- and second-order porous resistances, and Prandtl number on the fluid flow and heat transfer are investigated in terms of the local skin friction and local heat transfer parameters. In addition, velocity and temperature boundary layer profiles are plotted for all considered parameters. It is found that the heat transfer could be enhanced by increasing the Casson parameter and the porous resistance terms. To the contrary, the increase in the porosity reduces heat transfer rates. Finally, the increase in the Prandtl number enhances the heat transfer rates.

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Lin, Sheam Chyun, Cheng Ju Chang, Fu Yin Wang, Horng Ching Hsiao, Shiuh Kuang Yang, and Chun Yu Hsiao. "Heat Dissipation Capacity of Heat Sink Assembly with/without Vortex Generators." Applied Mechanics and Materials 598 (July 2014): 288–93. http://dx.doi.org/10.4028/www.scientific.net/amm.598.288.

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In this research, numerical simulation is adopted to study the cooling characteristic of a bracket-type heat sink assembly. Analysis on thermal/fluid fields are used to justify the physical mechanisms inducing the excessive heat dissipation and temperature rise. In order to enhance the cooling capacity of the heat sink assembly, two types of vortex generator, flow-up and flow-down were used to create the turbulent flow for increasing the contact opportunitybetween fluid and plate fin.Also, thermal resistance is used to evaluate the cooling capacity of the heat sink assembly in this work. As a result, the numerical simulations show thatapparent reductions on source temperature (from 348.0K to 346.2K) and thermal resistance (from 0.266 K/W to 0.253 K/W) are observed for a 150W power input. Besides, significant improvement on the heat concentrated phenomenon anduniform temperature distribution were acquired after installing the vortex generators.Furthermore,a larger longitudinal flow was generated when the flow-up type vortex generator was mounted; therefore the temperature distribution is more uniform than that of the flow-downtype. Clearly, the cooling capacity of heat sink assemblyis enhanced since the fluid is guided to the heat concentrated area when theflow-down vortex generators are adopted.

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Wang, Linlin. "NSGA-II-Based Microchannel Structure Optimization Problem Study." Scientific Programming 2022 (April 7, 2022): 1–7. http://dx.doi.org/10.1155/2022/6368018.

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A multiobjective genetic algorithm is used to optimize the structure of circular concave cavities and microchannels. The objective functions of thermal resistance and pumping power are constructed by the response plane approximation method according to the simulation results, and then a mathematical model of multiobjective genetic optimization with the structural parameters of microchannels as variables is established. The Pareto optimized solution sets of thermal resistance and pumping power are calculated by the nondominated ranking genetic algorithm NSGA-II, and the comprehensive heat transfer performance is evaluated by the enhanced heat transfer factor. The results show that the multivariate statistical coefficients R 2 of the thermal resistance and pumping power objective functions are 0.932 9 and 0.996 6, respectively, indicating the high accuracy of the fitted functions. The optimized channel structure ( e 1 = 0.036.8 mm , e 2 = 0.019.3 mm ) was used to achieve a more uniform temperature field distribution and better integrated heat transfer performance (enhanced heat transfer factor η = 1.23 ). When the thermal resistance is larger or the pump work is larger, the comprehensive heat transfer effect is not as good as the working condition when the thermal resistance and pump work are more uniform.

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Yu, Bingwei, Fangyan Ming, Yonggui Liang, Yixi Wang, Yuwei Gan, Zhengkun Qiu, Shuangshuang Yan, and Bihao Cao. "Heat Stress Resistance Mechanisms of Two Cucumber Varieties from Different Regions." International Journal of Molecular Sciences 23, no. 3 (February 5, 2022): 1817. http://dx.doi.org/10.3390/ijms23031817.

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High temperatures affect the yield and quality of vegetable crops. Unlike thermosensitive plants, thermotolerant plants have excellent systems for withstanding heat stress. This study evaluated various heat resistance indexes of the thermotolerant cucumber (TT) and thermosensitive cucumber (TS) plants at the seedling stage. The similarities and differences between the regulatory genes were assessed through transcriptome analysis to understand the mechanisms for heat stress resistance in cucumber. The TT plants exhibited enhanced leaf status, photosystem, root viability, and ROS scavenging under high temperature compared to the TS plants. Additionally, transcriptome analysis showed that the genes involved in photosynthesis, the chlorophyll metabolism, and defense responses were upregulated in TT plants but downregulated in TS plants. Zeatin riboside (ZR), brassinosteroid (BR), and jasmonic acid (JA) levels were higher in TT plants than in TS. The heat stress increased gibberellic acid (GA) and indoleacetic acid (IAA) levels in both plant lines; however, the level of GA was higher in TT. Correlation and interaction analyses revealed that heat cucumber heat resistance is regulated by a few transcription factor family genes and metabolic pathways. Our study revealed different phenotypic and physiological mechanisms of the heat response by the thermotolerant and thermosensitive cucumber plants. The plants were also shown to exhibit different expression profiles and metabolic pathways. The heat resistant pathways and genes of two cucumber varieties were also identified. These results enhance our understanding of the molecular mechanisms of cucumber response to high-temperature stress.

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Barauskas, Rimantas, Audrone Sankauskaite, and Ausra Abraitiene. "Investigation of the thermal properties of spacer fabrics with bio-ceramic additives using the finite element model and experiment." Textile Research Journal 88, no. 3 (December 5, 2016): 293–311. http://dx.doi.org/10.1177/0040517516677228.

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The heat resistance of fabric enhanced by bio-ceramic additives (BCAs) is investigated theoretically and experimentally in order to determine the influence of modification of the infrared (IR) absorption property of the fabric. The enhanced IR sensitivity of textiles improves the thermoregulatory processes when worn in cold environments. The finite element model has been developed by taking into account the coupled phenomena of heat conduction, surface convection and the interaction of the fabric with IR power flux by employing heat transfer differential equations and the Stefan–Boltzmann law. Evaluations of IR absorptivity, reflectivity and transmissivity, the temperature transients during the hot plate chamber test and heat retaining properties of the fabric heated by an IR lamp have been obtained experimentally and simulated by means of the developed finite element model. The values of model parameters have been found, which provided a satisfactory match between the computation and the experiment in all considered cases. Simultaneously, the obtained values were reasonably close to rough theoretical estimations. Efforts have been made to distinguish from each other the influence of diffusive and radiative components of heat transfer, which affect the results of thermal resistance tests. The comparative analysis of contributions of different heat exchange mechanisms allows a better understanding of the peculiarities of standard heat resistance measurement procedures applied to BCA-enhanced fabrics and facilitates the validation of the computational models.

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Cherevatova, Alla V., Igor V. Zhernovsky, M. I. Kozhukhova, and D. A. Alehin. "The Development of Composite Nanostructured Gypsum Binder with Enhanced Heat Resistance Performance." Materials Science Forum 945 (February 2019): 293–98. http://dx.doi.org/10.4028/www.scientific.net/msf.945.293.

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The subject of this study was an experimental confirmation of stability of composite nanostructured gypsum silicate binder (CNGSB) system under high-temperature exposure (up to 1000 °C). The hypothesis of the heat-resistance performance of gypsum-based binder was crystallization process in CNGSB system involving a silicate constituent as a reactive component in NB. XRD and DTA analyses demonstrated that thermal exposure of CNGSB to wide range of temperatures of 20–1000 °C leads to α-quartz to β-quartz phase transformation in the binder; amorphous alkali-aluminosilicate (gel) changes to crystal phase of Са-albite. The calculation of cell volumes characteristics for low-temperature (before thermal exposure) and high-temperature (after thermal exposure) phases was performed. The calculated ratios of unit cell volumes were close to 1 which ensures a structural stability of the GNB under thermal exposure and confirms its heat-resistant performance.

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Wang, L. M., and H. C. Lin. "Mechanical Property and Corrosion Resistance of Ti-15V-3Cr-3Sn-3Al Alloy Weldment with Ti-6Al-4V Filler Following a Gas Tungsten Arc Welding Process." Applied Mechanics and Materials 58-60 (June 2011): 326–31. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.326.

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In this study TIG welding was carried out in Ti-15V-3Cr-3Al-3Sn alloy by using Ti-6-4 alloy filler. The effect of two common industrial heat treatments (artificial aging treatment at 593°C/2hr /air cooling or a solution treatment at 788°C/30min/air cooling plus aging at 510°C/8hr/furnance cooling) on the microstructure, mechanical property and corrosion resistance of weldment were investigated. It appears that these post weld heat treatment result in enhanced mechanical property as well as its corrosion resistance. In addition, solution plus aging treatment presents the excellent mechanical property and corrosion resistance. TEM investigation is also carried out to observe the nano size precipitates in heat affected zone (HAZ) and fusion zone (FZ). The possible enhanced mechanisms are discussed.

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Lu, Shan, Tianquan Zhu, Lilin Luo, Nana Ouyang, Jian Hua, and Baohong Zou. "Divergent Roles of CNGC2 and CNGC4 in the Regulation of Disease Resistance, Plant Growth and Heat Tolerance in Arabidopsis." Agronomy 12, no. 9 (September 13, 2022): 2176. http://dx.doi.org/10.3390/agronomy12092176.

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Arabidopsis cyclic nucleotide-gated channels (CNGC) 2 and 4 are shown to negatively regulate disease resistance and heat tolerance and to positively regulate plant growth. Whether or not their functions in these processes are interdependent is largely unknown. Here, using the mutation of phytoalexin deficient 4 (PAD4) to inhibit the enhanced defense response and programmed cell death (PCD), we assessed the contribution of the altered defense response to the heat tolerance and plant growth in the cngc2 and cngc4 single and double mutants. The pad4 mutation reverted the enhanced disease resistance of the cngc2 and cngc4 mutants at the normal temperature (22 °C) but not at the elevated temperature (28 °C). The pad4 mutation slightly alleviated the dwarfism of the cngc2 and cngc4 mutants at 22 °C but not at 28 °C, indicating a small contribution from the defense response to plant growth regulation. The pad4 mutation also reduced the enhanced heat tolerance in the cngc mutants, suggesting an involvement of PCD in heat tolerance. In addition, a higher heat tolerance was correlated with more opened stomata under heat treatment among the wild type and mutants of the PAD4, CNGC2 and CNGC4 genes. In sum, this study suggests that the regulation of heat tolerance and plant growth by CNGC2 and CNGC4 is almost independent of their regulation of disease resistance. It also reveals a PAD4-dependent role of CNGC2 and CNGC4 in stomatal aperture regulation and heat tolerance.

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Zhou, Chengshuang, Jing Wang, Shiyin Hu, Huimin Tao, Bei Fang, Long Li, Jinyang Zheng, and Lin Zhang. "Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment." Journal of The Electrochemical Society 167, no. 14 (November 2, 2020): 141504. http://dx.doi.org/10.1149/1945-7111/abc10e.

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Wang, Zhaolong, Jixiong Sun, Ji Li, and Yanhua Zhu. "Heat Resistance Enhanced by Trinexapac-Ethyl and Benzyladenine Combination in Creeping Bentgrass." HortScience 41, no. 7 (December 2006): 1711–14. http://dx.doi.org/10.21273/hortsci.41.7.1711.

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Liu, Juanfang, Sikai Chen, Min Gan, and Qinghua Chen. "Heat transfer and flow resistance characteristics inside an innovative vortex enhanced tube." Applied Thermal Engineering 144 (November 2018): 702–10. http://dx.doi.org/10.1016/j.applthermaleng.2018.04.082.

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Cao, Yue, Yongchen Cui, Junling Liao, Chente Gao, Zhe Zhao, and Junfeng Zhang. "Sevoflurane Preconditioning Increases Stress Resistance via IMB-2/DAF-16 in Caenorhabditis Elegans." Dose-Response 20, no. 1 (January 2022): 155932582210828. http://dx.doi.org/10.1177/15593258221082886.

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Sevoflurane preconditioning has been proved to possess therapeutic effects on stress. However, the mechanism by which sevoflurane preconditioning protects against stress remains unclear. In this study, an acute model of heat stress in C.eleans was established. We investigated the dose-response of sevoflurane exposure on coordinated movement in C.elegans and time course for protection against heat stress of sevoflurane preconditioning to determine the optimal concentration and time point in the following experiments. EC99 of sevoflurane is 1.7% (1.3EC50) and sevoflurane preconditioning exerts the maximal protection at 6 hours after incubation, and these 2 parameters were used in our following experiments. We found that sevoflurane preconditioning increased DAF-16 nuclear translocation and enhanced the expression of DAF-16 during heat stress in N2 strain of C.elegans. DAF-16 mutation abolished the sevoflurane preconditioning-induced protection for heat stress. Furthermore, suppression of IMB-2 by RNAi prevented the upregulation of DAF-16 and enhancement of stress resistance caused by sevoflurane preconditioning. Overall, this work reveals that sevoflurane preconditioning increases the expression of DAF-16 via IMB-2 to enhance the stress resistance of C.elegans.

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Dlouhý, Ivo, Luděk Stratil, Hiroshi Fukutomi, and Makoto Hasegawa. "Crack Resistance Characterization in TiAl Intermetallics with Enhanced Toughness." Key Engineering Materials 741 (June 2017): 13–18. http://dx.doi.org/10.4028/www.scientific.net/kem.741.13.

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The paper is focused on the analysis of the role of lamellar microstructure in fracture performance of model TiAl intermetallic compound. Coarse lamellar colonies and, at the same time, fine lamellar morphology were prepared by compressive deformation at 1553 K (region of stable α phase in TiAl equilibrium diagram) followed by controlled cooling to 1473 K (region of α+g phase) with delay on this temperature and then cooling down. The fracture toughness was evaluated by means of chevron notch technique. In addition, because of enhanced toughness, crack resistance curves were obtained by load - unload technique of pre-racked beams, namely in two directions of crack propagation relative to lamellar structure. Extensive development of shear ligament toughening mechanism was observed in fracture surfaces leading to quite good fracture toughness thanks to the heat treatment applied.

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Doan, Nhu Khue, Quoc Dat Lai, Thi Kim Phung Le, and Tran Diem Ai Chau. "Influence of Heating and Sodium Acidic Polyphosphate on Inhibition of Salmonella Enteritidis and Lactobacillus Rhamnosus in Pomelo Juice." IOP Conference Series: Earth and Environmental Science 947, no. 1 (December 1, 2021): 012046. http://dx.doi.org/10.1088/1755-1315/947/1/012046.

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Abstract The research focused on the heat resistance of Salmonella Enteritidis (S. Enteritidis) and Lactobacillus rhamnosus (L. rhamnosus) in pomelo juice. Sodium acidic polyphosphate was used to enhance the inhibition of these bacteria in heat treatment of pomelo juice. Temperature increased from 52 to 58°C, D-values of S. Enteritidis decreased from 1.94 to 0.15 min. With L. rhamnosus, D value reduced from 0.15 to 0.72 min when the temperature increased from 60 to 75°C. Z values of L. rhamnosus and S. Enteritidis were 16.31 and 5.37°C, respectively. It means that heat resistance of L. rhamnosus is more than that of S. Enteritidis. Adding 0.1% of sodium acidic polyphosphate significantly enhanced the inhibition of S. Enteritidis and L. rhamnosus in the heating treatment of pomelo juice. The result can be applied for pasteurization of pomelo juice.

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Zhang, Baoxi, Xinghong Zhang, Yunfeng Qiu, Jiecai Han, PingAn Hu, Changqing Hong, Zujun Peng, Wenbo Han, Guiqing Chen, and Ping Hu. "Enhanced thermal shock resistance of ultra-high temperature ceramic by biomimetic surface modification." Journal of Materials Chemistry A 3, no. 5 (2015): 2199–206. http://dx.doi.org/10.1039/c4ta05589f.

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Ha, Hyo Jun, Ji Hun Park, and Seok Pil Jang. "Study on the Thermal Characteristics of Heat Pipes with Water-Based MWCNT Nanofluids." Applied Mechanics and Materials 110-116 (October 2011): 1879–85. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1879.

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In this paper, thermal characteristics of miniature heat pipes with grooved wick and water-based multiwalled carbon nanotubes(MWCNT) nanofluids(0.1, 0.2, and 0.5 vol.%) as working fluids are experimentally investigated. The thermal conductivity and thermal resistances are measured and compared with those of DI water. The thermal conductivity of water-based MWCNT nandfluids is enhanced by up to 29% compared with that of DI water. Experiments are performed under the same evaporation temperature condition. The thermal resistance of heat pipe is reduced from 30% to 35.2% as the volume fraction of nanoparticles inceasing from 0.1% to 0.5%. Finally, based on the experimental results, we present the reduction of the thermal resistances of the heat pipes compared with conventional heat pipes cannot be explained by only the thermal conductivity of water-based MWCNT nanofluids.

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Baral, Susil, Andrew J. Green, and Hugh H. Richardson. "Heat transport across a gold nanowire/water interface enhanced by the solution ionic strength." MRS Proceedings 1779 (2015): 33–38. http://dx.doi.org/10.1557/opl.2015.700.

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ABSTRACTLithographically fabricated gold nanowires are optically excited with 532nm CW laser and the local temperature change is measured in air, pure water and various concentration aqueous solutions of ionic solutes NaCl, Na2SO4 and MgSO4 using the thermal sensor film of Al0.94Ga0.06N embedded with Er3+ ions. The interface thermal resistance for heat transfer from the excited nanowires into the surrounding liquid is determined from the slopes of the temperature change versus laser intensity plots obtained for the nanowire excitation under various solutions. Addition of ionic solute molecules into the solution decreases the interface thermal resistance and hence leads to increased heat dissipation into the surrounding liquid. Interface thermal resistance decreases exponentially with the ionic strength of solution and saturates around zero for solution ionic strength of 0.3M and higher.

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Lee, Sang Do, Soo Youn Choi, and H. Moo Kwon. "Distinct cellular pathways for resistance to urea stress and hypertonic stress." American Journal of Physiology-Cell Physiology 300, no. 3 (March 2011): C692—C696. http://dx.doi.org/10.1152/ajpcell.00150.2010.

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During antidiuresis with elevated vasopressin, urea accumulates in the renal medulla to very high concentrations, imposing considerable cellular stress. How local cells cope with urea stress is relevant to the whole kidney because the renal medulla is the major site of residence for the renal stem cells. Previous studies showed that renal cells were incapable of preconditioning in moderate urea concentrations to enhance resistance to urea stress. Instead, preconditioning in moderately high salinity (moderate hypertonicity) has been shown to promote resistance to urea stress due to the induction of the molecular chaperone heat shock protein 70 (Hsp70), which is mediated by the transcription factor tonicity-responsive enhancer binding protein (TonEBP). Here we report that cell lines derived from the kidney and fibroblasts display enhanced resistance to urea stress after pretreatment in moderate, nonstressful concentrations of urea. Using TonEBP knockdown and immunoblot analyses, we demonstrate that TonEBP and Hsp70 are dispensable for the increased resistance to urea stress. These data suggest that cells in the renal medulla are capable of overcoming urea stress by activating distinct cellular pathways.

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Kolozsváriné Nagy, Judit, Ildikó Schwarczinger, Lóránt Király, Renáta Bacsó, Attila L. Ádám, and András Künstler. "Near-Isogenic Barley Lines Show Enhanced Susceptibility to Powdery Mildew Infection Following High-Temperature Stress." Plants 11, no. 7 (March 28, 2022): 903. http://dx.doi.org/10.3390/plants11070903.

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Barley cultivation is adversely affected by high-temperature stress, which may modulate plant defense responses to pathogens such as barley powdery mildew (Blumeria graminis f. sp. hordei, Bgh). Earlier research focused mainly on the influence of short-term heat stress (heat shock) of barley on Bgh infection. In this study, our aim was to investigate the effects of both short- and long-term heat stress (35 °C from 30 s to 5 days) on Bgh infection in the barley cultivar Ingrid and its near-isogenic lines containing different powdery mildew resistance genes (Mla12, Mlg, and mlo5) by analyzing symptom severity and Bgh biomass with RT-qPCR. The expression of selected barley defense genes (BAX inhibitor-1, Pathogenesis- related protein-1b, Respiratory burst oxidase homologue F2, and Heat shock protein 90-1) was also monitored in plants previously exposed to heat stress followed by inoculation with Bgh. We demonstrated that pre-exposure to short- and long-term heat stress negatively affects the resistance of all resistant lines manifested by the appearance of powdery mildew symptoms and increased Bgh biomass. Furthermore, prolonged heat stress (48 and 120 h) enhanced both Bgh symptoms and biomass in susceptible wild-type Ingrid. Heat stress suppressed and delayed early defense gene activation in resistant lines, which is a possible reason why resistant barley became partially susceptible to Bgh.

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Morino, Saori, Tatsuya Kondo, Kazunari Sasaki, Hironori Adachi, Mary Ann Suico, Erika Sekimoto, Tomoko Matsuda, Tsuyoshi Shuto, Eiichi Araki, and Hirofumi Kai. "Mild Electrical Stimulation with Heat Shock Ameliorates Insulin Resistance via Enhanced Insulin Signaling." PLoS ONE 3, no. 12 (December 30, 2008): e4068. http://dx.doi.org/10.1371/journal.pone.0004068.

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Wang, Z. T., H. J. Luo, Q. L. He, and H. Jiang. "Heat resistance of basalt fiber enhanced by silicious-fluoric-PAA hybrid sizing agent." Journal of Physics: Conference Series 1347 (December 2019): 012015. http://dx.doi.org/10.1088/1742-6596/1347/1/012015.

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35

Zhang, Zheng-Chi, Zi-Hong Sang, Yan-Fei Huang, Jia-Feng Ru, Gan-Ji Zhong, Xu Ji, Ruyin Wang, and Zhong-Ming Li. "Enhanced Heat Deflection Resistance via Shear Flow-Induced Stereocomplex Crystallization of Polylactide Systems." ACS Sustainable Chemistry & Engineering 5, no. 2 (January 17, 2017): 1692–703. http://dx.doi.org/10.1021/acssuschemeng.6b02438.

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Ming, Ruihao, Gesheng Yang, Yuzeng Li, Rong Wang, Huihui Zhang, and Huili Shao. "Flax fiber-reinforced polylactide stereocomplex composites with enhanced heat resistance and mechanical properties." Polymer Composites 38, no. 3 (May 29, 2015): 472–78. http://dx.doi.org/10.1002/pc.23605.

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Zhang, Huanhuan, Chuanfeng Wang, Yali Xu, Xi Huang, Xuebing He, Chaoliang Zhang, and Jun Lu. "Pressure-controlled crystallization of stereocomplex crystals in enantiomeric polylactides with remarkably enhanced hydrolytic degradation." CrystEngComm 20, no. 45 (2018): 7337–47. http://dx.doi.org/10.1039/c8ce01199k.

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Watanabe, Kazunori, and Takashi Ohtsuki. "Inhibition of HSF1 and SAFB Granule Formation Enhances Apoptosis Induced by Heat Stress." International Journal of Molecular Sciences 22, no. 9 (May 7, 2021): 4982. http://dx.doi.org/10.3390/ijms22094982.

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Stress resistance mechanisms include upregulation of heat shock proteins (HSPs) and formation of granules. Stress-induced granules are classified into stress granules and nuclear stress bodies (nSBs). The present study examined the involvement of nSB formation in thermal resistance. We used chemical compounds that inhibit heat shock transcription factor 1 (HSF1) and scaffold attachment factor B (SAFB) granule formation and determined their effect on granule formation and HSP expression in HeLa cells. We found that formation of HSF1 and SAFB granules was inhibited by 2,5-hexanediol. We also found that suppression of HSF1 and SAFB granule formation enhanced heat stress-induced apoptosis. In addition, the upregulation of HSP27 and HSP70 during heat stress recovery was suppressed by 2,5-hexanediol. Our results suggested that the formation of HSF1 and SAFB granules was likely to be involved in the upregulation of HSP27 and HSP70 during heat stress recovery. Thus, the formation of HSF1 and SAFB granules was involved in thermal resistance.

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Zhao, Fulong, Yiguo Mei, Tiebo Liang, Bin Wang, Hao Jing, and Weixiong Chen. "A Review on Heat Transfer Characteristics and Enhanced Heat Transfer Technology for Helium–Xenon Gas Mixtures." Energies 16, no. 1 (December 21, 2022): 68. http://dx.doi.org/10.3390/en16010068.

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As one of the most promising working substances for space nuclear power sources, research on the heat transfer characteristics of helium–xenon gas mixtures has become the key issue in focus. In this paper, through an extensive literature research, the current research results are classified and organized. The results show that there are semi-empirical formulas for physical property parameters with high prediction accuracy, and there are also Nusselt correlations with small errors. However, both lack the support of experimental data. There is no systematic research on enhanced heat transfer technologies, and the conclusions of the existing studies are not significant, so they can only make limited reference contributions to the future study of enhanced heat transfer technologies. More flow and heat transfer experiments on helium–xenon mixtures are urgently needed, through detailed analysis of the heat transfer performance of helium–xenon flow, identifying the key factors affecting the heat transfer thermal resistance, and corresponding heat transfer enhancement measures to form an optimized design method applicable to helium–xenon heat exchangers. In this way, an enhanced heat transfer theory of helium–xenon heat exchangers can be developed.

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Wang, Jie, Zixin Yu, Peihua Li, Dachuan Ding, Xuan Zheng, Chuanqun Hu, Tao Hu, Xinghou Gong, Ying Chang, and Chonggang Wu. "Poly(styrene-ran-cinnamic acid) (SCA), an approach to modified polystyrene with enhanced impact toughness, heat resistance and melt strength." RSC Advances 9, no. 68 (2019): 39631–39. http://dx.doi.org/10.1039/c9ra08635h.

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41

Guan, Xiao-fang, Cong Liao, Li Yang, and Guan-jun Chang. "Indole-based high-performance polymeric materials with enhanced mechanical and thermal properties via cation-π interaction." High Performance Polymers 32, no. 6 (December 23, 2019): 662–68. http://dx.doi.org/10.1177/0954008319894045.

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The preparation of high-performance polymeric materials with both excellent overall mechanical properties and heat resistance remains a considerable challenge. Inspired by the delicate self-assembly processes in nature, a facile strategy is reported for the preparation of high-performance polymeric materials with enhanced mechanical strength and improved thermal stability. In this instance, we successfully constructed a cation- π cross-linked polyimide (Na-poly(aryl indole) imide (Na-PINI)) film with enhanced mechanical performance and heat resistance (∼490°C). This work presents an innovative design strategy for realizing robust polymeric materials with integrated strength and thermal stability; the cation- π interaction is demonstrated to be a new method that may achieve many useful properties for high-performance polymers.

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Movahedi, Sara, and William Waites. "A Two-Dimensional Protein Gel Electrophoresis Study of the Heat Stress Response of Bacillus subtilis Cells during Sporulation." Journal of Bacteriology 182, no. 17 (September 1, 2000): 4758–63. http://dx.doi.org/10.1128/jb.182.17.4758-4763.2000.

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ABSTRACT The heat resistance of spores of Bacillus subtilisformed at 30°C was enhanced by pretreatment at 48°C for 30 min, 60 min into sporulation, for all four strains examined. High-resolution two-dimensional gel electrophoresis showed the generation and/or overexpression of 60 proteins, 11 of which were specific to heat shock, concurrent to this acquired thermotolerance. The greatest number of new proteins was observed between 30 and 60 min after heat shock, and the longer the time between exponential growth and heat treatment, the fewer differences were observed on corresponding protein profiles. The time at which heating produced the maximum increase in spore resistance and the most new proteins on two-dimensional gels occurred before alkaline phosphatase and dipicolinic acid production and corresponded to stage I or II of sporulation. The stress proteins formed disappeared later in sporulation, suggesting that heat shock proteins increase spore heat resistance by altering spore structure rather than by repairing heat damage during germination and outgrowth.

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43

Zhu, Zhangyu, Juan Li, Hao Peng, and Dongren Liu. "Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction." Micromachines 12, no. 6 (June 3, 2021): 656. http://dx.doi.org/10.3390/mi12060656.

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Heat exchangers are general equipment for energy exchange in the industrial field. Enhancing the heat transfer of a heat exchanger with low pump energy consumption is beneficial to the maximum utilization of energy. The optimization design for enhanced heat transfer structure is an effective method to improve the heat transfer coefficient. Present research shows that the biomimetic structures applied in different equipment could enhance heat transfer and reduce flow resistance significantly. Firstly, six biomimetic structures including the fractal-tree-like structure, conical column structure, hybrid wetting structure, scale structure, concave-convex structure and superhydrophobic micro-nano structure were summarized in this paper. The biomimetic structure characteristics and heat transfer enhancement and drag reduction mechanisms were analyzed. Secondly, four processing methods including photolithography, nanoimprinting, femtosecond laser processing and 3D printing were introduced as the reference of biomimetic structure machining. Finally, according to the systemic summary of the research review, the prospect of biomimetic heat transfer structure optimization was proposed.

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Jamin, Yorwearth L., and Abdulmajeed A. Mohamad. "Enhanced Heat Transfer Using Porous Carbon Foam in Cross Flow—Part I: Forced Convection." Journal of Heat Transfer 129, no. 6 (August 15, 2006): 735–42. http://dx.doi.org/10.1115/1.2717240.

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Cogeneration of heat and power has become standard practice for many industrial processes. Research to reduce the thermal resistance in heat exchangers at the gas/solid interface can lead to greater energy efficiency and resource conservation. The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins. The study measures the heat transfer rate and pressure drop from a heated vertical pipe, with and without porous medium, in forced convection. The largest increase in Nusselt number was achieved by aluminum fins, which was about three times greater than the best carbon foam case.

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Teng, Tun Ping, Bo Gu Lin, and Yun Yu Yeh. "Characterization of Heat Storage by Nanocomposite-Enhanced Phase Change Materials." Advanced Materials Research 287-290 (July 2011): 1448–55. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1448.

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This study involved a two-step method of adding multi-walled carbon nanotube (MWCNTs) and alumina (Al2O3) nanoparticles to paraffin wax, forming nanocomposite-enhanced phase change materials (NEPCMs). The NEPCMs in a phase change experiment were influenced by the concentrations of the nano-materials and the heating temperature of water. The objective of this paper is to investigate the optimal parameters of added nano-materials. The experimental results show that the phase change temperature of the paraffin wax slightly increases after adding the nano-materials to the paraffin wax. In addition, the nano-materials in the paraffin wax will reduce the temperature difference between test samples and heating water, indicating that adding the nano-materials can effectively reduce the thermal resistance of the experimental samples and improve the efficiency of thermal energy storage.

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Gordon, C. L. André, and M. H. Ahmad. "Thermal susceptibility of Streptococcus faecium strains isolated from frankfurters." Canadian Journal of Microbiology 37, no. 8 (August 1, 1991): 609–12. http://dx.doi.org/10.1139/m91-103.

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The heat resistance of nine strains of Streptococcus faecium isolated from frankfurters was determined at 63 and 68 °C in brain heart infusion broth. Exponential-phase cultures (approximately 107 colonies/mL) were used as inoculants. The heat resistance of S. faecium DP2181, a moderately resistant isolate, was further examined in broth (55, 63, and 68 °C) and frankfurter emulsion (63 and 68 °C). The decimal reduction times (D values) were determined by regression. In broth, both time–temperature combinations resulted in a 3–4 log decline in bacterial numbers for the nine S. faecium strains tested. For S. faecium DP2181, the survivor curves deviated from the logarithmic order of death at all three heating temperatures. An initial slow period of death was evident at 55 °C and a resistant tail of organisms was observed at 55, 63, and 68 °C. The D55D63, and, D68 values for the logarithmic portion of the corresponding survivor curves were 105.6, 9.36, and 3.34 min, respectively. The survival of DP2181 was enhanced by the frankfurter emulsion. The results indicate that populations of S. faecium existed that were very heat resistant and could survive normal frankfurter processing if initially present in high numbers. Key words: heat resistance, enterococci, D value, resistant tail.

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47

Mahmood, Reem Y., and Aseel Alobaedy. "Enhancement of thermal stability and wettability for epoxy/Cu coated carbon fiber composites." Iraqi Journal of Physics (IJP) 18, no. 47 (November 30, 2020): 55–61. http://dx.doi.org/10.30723/ijp.v18i47.611.

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This research study the effect of surface modification and copper (Cu) plating carbon fiber (CF) surface on the thermal stability and wettability of carbon fiber (CF)/epoxy (EP) composites. The TGA result indicates that the thermal-stability of carbon fiber may be enhanced after Cu coating CF. TGA curve showed that the treatment temperature was enhanced thermal stability of Ep/CF, this is due to the oxidation during heating. The Cu plating increased the thermal conductivity, this increase might be due to reduce in contact resistance at the interface due to chemical modification and copper plating and tunneling resistance. The increase of surface polarity after coating cause decrease in the value of contact angle. As well as the increase of CuO as a function of the heat temperature cause the rapid contact angle decrease and can strongly enhance the wettability.

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Zhang, Dong Hui, and Jiao Gao. "Numerical Study of Circular Tube inserted Arc Belt on Fluid Flow and Heat Transfer under Laminar Flow." Key Engineering Materials 561 (July 2013): 460–65. http://dx.doi.org/10.4028/www.scientific.net/kem.561.460.

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The objective of this paper is to study the characteristic of a circular tube with a built-in arc belt on fluid flow and heat transfer in uniform wall temperature flows. Numerical simulations for hydrodynamically laminar flow was direct ran at Re between 600 and 1800. Preliminary results on velocity and temperature statistics for uniform wall temperature show that, arc belt can swirl the pipe fluid, so that the fluid at the center of the tube and the fluid of the boundary layer of the wall can mix fully, and plays the role of enhanced heat transfer, but also significantly increases the resistance of the fluid and makes the resistance coefficient of the enhanced tube greater than smooth tube. The combination property PEC is all above 1.5.

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Alshukri, Mohammed, Adel Eidan, and Saleh Najim. "An Experimental Study on Micro-Enhanced TESM Incorporated Inside Evacuated Tube Solar Collector Equipped with Heat Pipe." Basrah journal for engineering science 21, no. 3 (October 5, 2021): 1–9. http://dx.doi.org/10.33971/bjes.21.3.1.

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The incorporation of thermal energy storage materials (TESMs) into solar energy systems is a factor that boosts the performance of these systems. In this paper, an experimental study was addressed for enhancing the heat pipe’s thermal performance that works with an Evacuated Solar Tube Collector with Heat Pipe (ETCHP) as a solar water heater system. This is done by adding micro-zinc oxide (ZnO-MP) to the paraffin wax integrated as TESM into the evacuated tube (ET) of the system, where the evaporator section of the heat pipe is completely submerged within the micro-enhanced paraffin wax. Three experimental prototype rigs with one evacuated tube were designed, built, and tested to do the investigation. The most important parameters that have been studied in this study are the thermal resistance and the temperature distribution pattern along the heat pipe. The results show a clear indication of the decrease in the thermal resistance of the heat pipe of the proposed system compared to the system in which pure paraffin wax was incorporated. Also, it was noticed that there is a significant improvement in the temperature distribution along the heat pipe due to the improvement in the conductivity of the micro-enhanced wax compared to the pure wax.

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Zheng, Wen Jie, Zhi Gang Song, Han Feng, and Zi Jun Wang. "The Effect of Heat Treatment on the Performances of Inconel690 Heat Transfer Tube." Key Engineering Materials 573 (September 2013): 77–86. http://dx.doi.org/10.4028/www.scientific.net/kem.573.77.

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This article mainly studied the influence rule of heat treatment temperature on the performances of Inconel690 heat transfer tube. The microstructure, mechanical performances and corrosion properties were studied under different heat treated conditions. The optimized heat treatment process was obtained. The conclusions was as follows: with the increase of solution temperature from 1050°C to 1150°C, the mean grain size varied from 12μm to 58μm, the room temperature tensile strength and yield strength reduced gradually, while the elongation elevated gradually. The alloy had a good resistance to pitting corrosion after solutionization during 1090~1100°C.The massive carbides (M23C6) were precipitated along grain boundaries after sensitization processing. And with the increase of sensitization temperature, its morphology transform from tiny semicontinuous to coarsening continuously, multi-layered distribution emerged during higher sensitization temperature range. Along with the sensitization temperature rising, alloy 690 has better resistance to intergranular corrosion. As the sensitization temperature was higher than 750°C with isothermal holding for 2 hours, the desensitization phenomenon occurred, and the ability of anti-intergranular corrosion for alloy 690 could be enhanced distinctly.

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Journal articles on the topic 'Enhanced Heat Resistance'

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