Thematische Bibliographien / Long-term thermal exposure

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Auswahl der wissenschaftlichen Literatur zum Thema „Long-term thermal exposure“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 5. Februar 2022

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Zeitschriftenartikel zum Thema "Long-term thermal exposure"

Caron, Jeremy, und Lee Pike. „Weldability of HAYNES 282 superalloy after long-term thermal exposure“. MATEC Web of Conferences 14 (2014): 13003. http://dx.doi.org/10.1051/matecconf/20141413003.

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Ning, Haoran, Zhaojun Wang und Yuchen Ji. „Thermal history and adaptation: Does a long-term indoor thermal exposure impact human thermal adaptability?“ Applied Energy 183 (Dezember 2016): 22–30. http://dx.doi.org/10.1016/j.apenergy.2016.08.157.

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Okazaki, M., S. Shirai und T. Uchiyama. „Effect of Long Term Thermal Exposure on Adhesion Strength of TBC“. Proceedings of the JSME annual meeting 2003.1 (2003): 111–12. http://dx.doi.org/10.1299/jsmemecjo.2003.1.0_111.

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Srinivasan, V., N. S. Cheruvu, T. J. Carr und C. M. O'rien. „Degradation of MCrAlY Coating and Substrate Superalloy During Long Term Thermal Exposure“. Materials and Manufacturing Processes 10, Nr. 5 (September 1995): 955–69. http://dx.doi.org/10.1080/10426919508935082.

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Wang, Ting Ting, Chang Shuai Wang, Jian Ting Guo und Lan Zhang Zhou. „Stability of Microstructure and Mechanical Properties of GH984G Alloy during Long-Term Thermal Exposure“. Materials Science Forum 747-748 (Februar 2013): 647–53. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.647.

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A low cost Ni-Fe-based wrought superalloy for 700 advance ultra-supercritical coal-fired power plants was developed. The stability of microstructure and mechanical properties of this alloy during long-term thermal exposure was investigated by SEM,TEM and tensile tests. The experimental results showed that the major precipitates in the alloy were spherical γ, MC and discrete M23C6 distributing along grain boundary after the long-term exposure at 700 and 750 and no harmful phases, such as σ phase and η phase, were found. However, after exposure at 800 up to 3000 h, small amount of lath-like η phase precipitated at grain boundary by consuming the surrounding γ. The η phase exhibited a fixed orientation relationship with the γ matrix. During thermal exposure γ coarsened with increasing the exposure time and exposure temperature. In addition, all major phases and their stability temperature ranges were calculated by JMatPro and these results were confirmed by the experimental results. The 700 tensile tests revealed that the alloy after exposure at 700 and 750 for 3000 h exhibited excellent ductility and strength. Therefore, the GH984G alloy possessed excellent stability of microstructure and mechanical properties between 700 and 750 up to 3000 h, and it is a promising material for 700 advance ultra-supercritical coal-fired power plants.

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Chen, Zhiyuan, Zhengkun Cai, Xiaosong Jiang, Song Chen, Zewen Huang und Hongliang Sun. „Microstructure Evolution of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Long-Term Thermal Exposure“. Materials 13, Nr. 7 (02.04.2020): 1638. http://dx.doi.org/10.3390/ma13071638.

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The hot-rolled alloy Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y was exposed to 700 °C air for up to 10,000 h. The changes in microstructure were observed using scanning and transmission electron microscopies. It was found that the α2 laths, α2 + γ lamellae, and B2(ω) structure of the alloy showed thermodynamic instability. There were three types of phase transformation in the alloy during long-term thermal exposure. The first was α2 → γ, which occurs in the interior and boundary of the α2 + γ lamellae. The second was α2 + γ → B2(ω), which occurs on the α2 + γ boundary. In addition, B2(ω) also precipitates on the γ/γ interfaces. The third was B2(ω) → γ, which describes the precipitation of micron-scale γ phases in the B2(ω) area after thermal exposure of 5000 h. The volume fraction and size of the B2(ω) area and equiaxed γ grains continued to increase throughout the exposure process. Large-sized γ grains and a B2 area of tens of microns appeared in the microstructure after long-term thermal exposure. The volume fractions of the B2 area and the equiaxed γ grains after thermal exposure of 10,000 h reached 16.8% and 63.2%, respectively.

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Han, G. W., und Y. Y. Zhang. „Variations in microstructure and properties of GH783 alloy after long term thermal exposure“. Materials Science and Engineering: A 441, Nr. 1-2 (Dezember 2006): 253–58. http://dx.doi.org/10.1016/j.msea.2006.08.092.

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Varghese, Paulson, Prabhat Kumar Shukla, E. Vetrivendan, Sanjay Kumar Das, D. Ponraju und S. Ningshen. „Long-term exposure of MgAl2O4 and Y2O3 thermal barrier coatings in molten sodium“. Surface and Coatings Technology 381 (Januar 2020): 125111. http://dx.doi.org/10.1016/j.surfcoat.2019.125111.

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Song, Erdong, Brian S. Swartzentruber, Chowdary R. Koripella und Julio A. Martinez. „Highly Effective GeNi Alloy Contact Diffusion Barrier for BiSbTe Long-Term Thermal Exposure“. ACS Omega 4, Nr. 5 (29.05.2019): 9376–82. http://dx.doi.org/10.1021/acsomega.9b00551.

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Xiao, Xuan, Xu Le, Zeng Chao, Li Yuan Sheng, Yong An Guo und Lan Zhang Zhou. „Carbide Evolution of a Directionally Solidified Ni-Based Superalloy during Long-Term Exposure“. Advanced Materials Research 452-453 (Januar 2012): 72–76. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.72.

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Directionally solidified Ni-based superalloy DZ483 is a kind of potential material for the blade of an advanced heavy duty gas turbine, which has good combination properties. The carbide degradation behaviors of DZ483 alloy during long-term thermal exposures were investigated at different conditions in this paper. The results show that during the long-term exposure, primary carbide will decompose in the form of MC + γ → M23C6 + γ'. Carbide on the grain boundary could be decomposed more easily than intragranular carbide. With the increase of aging time, decomposition could be observed more obviously, carbides on the grain boundary become bigger and the morphology of carbide near the grain boundary tends to be more complex. The fine dispersive particles of M23C6 on the grain boundary will grow up gradually to a thin consecutive chain of carbide with the increase of aging time.

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Dissertationen zum Thema "Long-term thermal exposure"

Kander, Jan. „Kinetika šíření únavových trhlin v ocelích P91 a P92“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442745.

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The main subject of this master’s thesis was to evalute inluence of loading cycle asymmetry and long-term thermal exposure on fatigue crack growth rate in martensitic P91 and P92 steels. Experiments were carried out in Material and metallurgical research Ostrava Ltd. and their main aim was to study the influences of different loading cycle asymmetries (R = 0,1 and R = 0,6) as well as 5000 hours/600 °C (P91) respectively 5000 hours/650 °C (P92) of thermal exposure on fatigue crack growth rate.

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Gu, Haosheng, Yasuo Kitane, Yoshito Itoh und Paramashanti. „LONG-TERM PERFORMANCE EVALUATION OF HIGH DAMPING RUBBER BEARINGS BY ACCELERATED THERMAL OXIDATION TEST“. 2007. http://hdl.handle.net/2237/18871.

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Bücher zum Thema "Long-term thermal exposure"

McKeen, Laurence W. Effect of Long Term Thermal Exposure on Plastics and Elastomers. Elsevier Science & Technology Books, 2013.

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McKeen, Laurence W. Effect of Long Term Thermal Exposure on Plastics and Elastomers. Elsevier Science & Technology Books, 2013.

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The Effect of Long Term Thermal Exposure on Plastics and Elastomers. Elsevier, 2014. http://dx.doi.org/10.1016/c2013-0-00091-6.

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The Effect of Long Term Thermal Exposure on Plastics and Elastomers. Elsevier, 2021. http://dx.doi.org/10.1016/c2020-0-02194-8.

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Buchteile zum Thema "Long-term thermal exposure"

Pike, L. M. „Long Term Thermal Exposure of HAYNES 282 Alloy“. In Superalloy 718 and Derivatives, 644–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch50.

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Kostopoulos, V., und D. E. Vlachos. „Long Term Behaviour of Continuous Fiber Oxide/Oxide Composites Under Thermal Exposure“. In Recent Advances in Composite Materials, 215–26. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_18.

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McKeen, Laurence W. „Introduction to the Physical, Mechanical, and Thermal Properties of Plastics and Elastomers“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 43–71. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00003-5.

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McKeen, Laurence. „Introduction to the physical, mechanical, and thermal properties of plastics and elastomers“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 35–64. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-323-85436-8.00009-6.

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McKeen, Laurence W. „Introduction to Plastics and Polymers“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 1–16. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00001-1.

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McKeen, Laurence W. „Introduction to the Effect of Heat Aging on Plastics“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 17–42. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00002-3.

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McKeen, Laurence W. „Styrenic Plastics“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 73–84. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00004-7.

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McKeen, Laurence W. „Polyesters“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 85–115. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00005-9.

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McKeen, Laurence W. „Polyimides“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 117–37. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00006-0.

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McKeen, Laurence W. „Polyamides (Nylons)“. In The Effect of Long Term Thermal Exposure on Plastics and Elastomers, 139–70. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-323-22108-5.00007-2.

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Konferenzberichte zum Thema "Long-term thermal exposure"

Pike, L. „Long Term Thermal Exposure of HAYNES 282 Alloy“. In Superalloys. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.7449/2010/superalloys_2010_645_660.

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Pike, L. M., und S. K. Srivastava. „Long Term Thermal Stability of Several Gas Turbine Alloys“. In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68959.

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Ever increasing demands for lower gas turbine operating costs have led to the need for longer lasting components. This in turn, requires the availability of alloys which are reliable to such long lifetimes. In the mill produced condition, most alloys have desirable microstructures and mechanical properties. However, after exposure to the harsh temperatures found in gas turbine engines, the microstructures of most alloys will begin to change. The effects on the mechanical properties of such microstructural changes can range from mild deterioration to significant degradation. In this paper, the effects of thermal exposures at temperatures from 1200 to 1600°F for durations up to one year on the mechanical properties of three wrought gas turbine alloys will be reported. The alloys will include HAYNES® 188 alloy (Co-Ni-Cr-W), HAYNES 230® alloy (Ni-Cr-W), and HAYNES HR-120® alloy (Fe-Ni-Cr-Nb-N).

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Lall, Pradeep, Madhu Kasturi, Haotian Wu und Edward Davis. „Effect of Long Term Isothermal Exposure on Underfill Material Properties“. In 2020 19th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2020. http://dx.doi.org/10.1109/itherm45881.2020.9190482.

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Mannan, Sarwan, und John deBarbadillo. „Long Term Thermal Stability of INCONEL Alloy 783“. In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-508.

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Recently developed INCONEL® alloy 783 (nominal composition of Ni-34Co-26Fe-5.4Al-3Nb-3Cr) is precipitation strengthened by Ni3Al-type Gamma Prime and NiAl-type Beta Phases. Due to its low co-efficient of thermal expansion (CTE), high strength, and good oxidation resistance alloy 783 has been specified for use in aircraft gas turbine components such as rings, casings, shrouds, and seals and has been considered for use in a number of other critical industrial turbine components. In this study, commercially produced alloys 783, 718, and 909 were annealed and aged following recommended heat treatments. The materials were then isothermally exposed at 1100°F (593°C) for times up to 10,000 hours. At 1000 hour intervals, specimens of these alloys were removed from the furnace and subjected to room temperature tensile (RTT) and high temperature tensile (HTT) testing at 1200°F (649°C). The microstructure of as-produced and exposed materials was characterized using optical microscopy, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). Variation in tensile properties with isothermal exposure time was correlated with the microstructure.

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Zhang, Bao-Ning, Chao Yuan, Jian-Ting Guo, He-Yong Qin und Guang-Pu Zhao. „Morphological evolution of γ′ precipitates in wrought nickel-based superalloy GH4742 during long-term thermal exposure“. In 2016 International Conference on Advanced Materials, Technology and Application (AMTA2016). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813200470_0036.

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Fifield, Leonard S., Robert Duckworth und Samuel W. Glass. „Long Term Operation Issues for Electrical Cable Systems in Nuclear Power Plants“. In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60729.

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Nuclear power plants contain hundreds of kilometers of electrical cables including cables used for power, for instrumentation, and for control. It is essential that safety-related cable systems continue to perform following a design-basis event. Wholesale replacement of electrical cables in existing plants facing licensing period renewal may be both impractical and cost-prohibitive. It is therefore important to understand the long term aging of cable materials to have confidence that aged cables will perform when needed. It is equally important in support of cable aging management to develop methods to evaluate the health of installed cables and inform selective cable replacement decisions. The most common insulation materials for electrical cables in nuclear power plants are cross-linked polyethylene and ethylene-propylene rubber. The mechanical properties of these materials degrade over time in the presence of environmental stresses including heat, gamma irradiation, and moisture. Mechanical degradation of cable insulation beyond a certain threshold is unacceptable because it can lead to insulation cracking, exposure of energized conductors, arcing and burning or loss of the ability of the cable system to function during a design-basis accident. While thermal-, radiation-, and moisture-related degradation of polymer insulation materials has been extensively studied over the last few decades, questions remain regarding the long term performance of cable materials in nuclear plant-specific environments. Identified knowledge gaps include an understanding of the temperature-dependence of activation energies for thermal damage and an understanding of the synergistic effects of radiation and thermal stress on polymer degradation. Many of the outstanding questions in the aging behavior of cable materials relate to the necessity of predicting long-term field degradation using accelerated aging results from the laboratory. Materials degrade faster under more extreme conditions, but extension of behavior to long term degradation under more mild conditions, such as those experienced by most installed cables in nuclear power plants, is complicated by the fact that different degradation mechanisms may be involved in extreme and mild scenarios. The discrepancy in predicted results from short term, more extreme exposure and actual results from longer term, more mild exposures can be counter intuitive. For instance, due to the attenuation of oxidation penetration in material samples rapidly aged through exposure to high temperatures, the bulk of the samples may be artificially protected from thermal aging. In another example, simultaneous exposure of cable insulation material to heat and radiation may actually lead to less damage at higher temperatures than may be observed at lower temperatures. The Light Water Reactor Sustainability program of the United States (US) Department of Energy (DOE) Office of Nuclear Energy is funding research to increase the predictive understanding of electrical cable material aging and degradation in existing nuclear power plants in support of continued safe operation of plants beyond their initial license periods. This research includes the evaluation and development of methods to assess installed cable condition.

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Seeley, R. R., und D. L. Klarstrom. „Fracture Toughness Properties of a Modern Ni-Mo-Cr High Temperature Alloy“. In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0336.

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The Ni-Mo-Cr alloy (HAYNES® 242™) is an age-hardenable alloy that can be significantly strengthened by a simple aging heat treatment at 650°C (1200°F). Long-term thermal exposures at moderate temperatures increase the strength and decrease the ductility and Charpy V-notch impact toughness. Tensile ductility and Charpy impact toughness have traditionally been used to study the effect of long-term thermal exposure on mechanical properties. However, there has been little or no work reported on the effect of long-term thermal exposures on the fracture toughness of nickel-base alloys. The room temperature fracture toughness (KJc) properties have been evaluated for Ni-Mo-Cr plate material in the annealed, annealed and aged, and annealed plus long-term thermal exposed condition. The microstructural and fracture mode characteristics of this alloy were examined as well. The tensile ductility, impact toughness and fracture conditions of the toughness properties were decreased by a long-term thermal exposure at 650°C (1200°F). The fracture toughness test data revealed the crack extension during the KJc tests to be stable throughout the test. The mechanical property data suggest a strong relationship between fracture toughness and tensile ductility. The microstructures and fracture surface morphologies for three metallurgical conditions of the Ni-Mo-Cr alloy are presented.

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Akkbik, Mohammed, Mohamed Izham Mohamed Ibrahim, Mohammad Diab, Ayad Moslih, Ahmed Makhlouf, Loua Al Shaikh, Guillaume Alinier und Ousama Rachid. „Thermal Stability of 0.9% Sodium Chloride IV Fluid exposed to Short- and Long-Term Extreme Conditions“. In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0135.

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Purpose: 0.9% sodium chloride IV fluid (normal saline) is critical in a clinical setting and may save lives. Data on thermal stability of normal saline, in out-of-hospital settings, are lacking. The purpose of this study was to evaluate the effect of temperature on normal saline stability. Method: Normal saline provided in flexible plastic containers (Qatar Pharma, BA:1929013008, n=96) were stored at constant temperature of 22, 50, or 70°C, and at cyclic temperature of 70°C for 8 hours and 22°C for 16 hours for a period up to 28 days. The containers were sampled at 0, 12, 24, 48 and 72 hours and at 1, 2, 3, and 4 weeks in the short- and long-term study, respectively. Fluid inside containers was evaluated for discoloration, turbidity, bulging, and pH. A 1 mL of normal saline was withdrawn from each container and stored at 4°C until analysis. A 20 µL was diluted in 12 mL distilled water to be injected into ion exchange chromatography instrument (Metrohm, 850 Professional IEC) for the measurement of sodium and chloride levels. Results: Discoloration or turbidity of normal saline fluid was not observed at any temperature or exposure period. The container slightly bulged at 50˚C and largely bulged at 70˚C & cyclic. The pH was 5.59±0.08 at 22˚C, 5.73±0.04 at 50˚C, 5.86±0.02 at 70˚C and 5.79±0.03 at cyclic. Remaining sodium and chloride levels ranged from 100.2±0.26% to 111.27±4.22% and from 99.04±0.76 to 110.95±2.62%, respectively. Conclusion: Normal saline containers are stable up to 4 weeks under simulated constant and cyclic high temperatures. Storage in the cabinet of ambulance vehicles during hot summer season in an arid country like Qatar is to be assessed in real-life conditions.

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Cheruvu, N. S., K. S. Chan und D. W. Gandy. „Effect of Time and Temperature on TBC Failure Mode Under Oxidizing Environment“. In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51528.

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Thermal barrier coatings (TBC) have been recently introduced on hot section components; such as transition pieces and first two stages of turbine blades and vanes of advanced F, G, and H class land-based turbine engines. The TBC coating is typically applied on metallic coated components. The metallic bond coat provides oxidation and/or corrosion protection. It is generally believed that the primary failure mode of TBCs is delamination and fracture of the top ceramic coating parallel to the bond coat in the proximity of the thermally grown oxide (TGO) between the coatings. One of the concerns associated with the use of a TBC as a prime reliant coating is its long-term stability. The effect of long-term operation at typical land based turbine operating temperatures below 1010°C (1850°F) on the failure mode of TBCs is unknown. Long-term isothermal tests were conducted on the TBC coated specimens at three temperatures, 1010°C (1850°F), 1038°C (1900°F), and 1066°C (1950°F) to determine the effects of long term exposure on the TBC failure location (mode). Following isothermal testing, the samples were destructively examined to characterize the degradation of TBC and determine the extent of TGO cracking, TGO growth, bond coat oxidation, and TBC failure location after long term exposure for up to 18000 hours. Optical microscopy and scanning electron microscope (SEM) attached with an energy dispersive spectroscopy (EDS) system were used to study the degradation of the TBC and bond coatings. The results showed that long term isothermal exposure leads to a change in the TBC failure mode from delamination of TBC at the TGO/TBC interface to internal oxidation of the bond coat and the bond coat delamination. In this paper, the effect of long-term exposure on delamination of TBC and bond coat failure mode is discussed.

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Nakano, Mitsuyuki, Haruko Sasaki und Kanji Hanashima. „The Prediction of Long-Term and Emergency Sealability of Silicone and EPDM Gaskets“. In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-30169.

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At nuclear power plants, containment vessel acts as pressure barrier in such an emergency as a loss-of-coolant accident. It is important as safety equipment to prevent radiological from leaking outside. Rubber gaskets, which are used for sealing faces of containment vessel, are needed to maintain certain sealability not only in stable condition but also in an emergent situation. Among important characteristics of the rubber gasket are not only physical property changes after general aging test (for example, tensile strength changes after heat resistance test) that indicate long-term stability of gasket itself, but also after radiation resistance test which gives potential to good substitute characteristic in terms of sealability in such cases. Physical property changes after general aging test do not always substitute sealability in an emergency, because they do not reflect effects of radiation. That is why nuclear power plant engineers must choose suitable rubber materials that have high performance in radiation resistance. In Japan, silicone rubber gaskets have been used for containment vessel for a long time since 1970th, but in the United States, ethylene propylene diene terpolymer (EPDM) gaskets have been widely used. NICHIAS has silicone rubber and EPDM materials for containment vessel and these gaskets have been used in nuclear power plant. But it is not obvious why different materials have been used in two countries because few relative comparisons of the two materials have been carried out. Especially silicone rubber and EPDM gaskets have many combinations of chemical compositions, so it is difficult to evaluate gasket suitability for containment vessel. There are many kinds of studies concerning long-term stability and life of gasket, but we all must know what characteristics relate sealability under radiation exposure condition and are suitable for guidepost of sealability under previous condition. This report compares silicone rubber gasket with EPDM gasket on physical property changes under irradiation and thermal treatment. We report compression set test results about one each type of silicone rubber and EPDM gasket under irradiation from Co60. And we also report relationships in physical property changes between irradiation and thermal treatment. Finally NICHIAS predicts long-term and emergency sealability of these gaskets from the results of evaluation. We hope it will be a part of design guideline of rubber gasket for containment vessel.

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