Relevant bibliographies by topics / Thermomechanical treatment (TMT) process

Academic literature on the topic 'Thermomechanical treatment (TMT) process'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Thermomechanical treatment (TMT) process"

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Chen, Xiao Zhu, Yuan Zheng Yang, Qiu Sheng Lin, and Xiao Jun Bai. "The Optimization of Thermomechanical Treatment and Properties of Cu-Fe-P Alloy C194." Advanced Materials Research 415-417 (December 2011): 724–27. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.724.

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The Cu-Fe-P alloy C194 for lead frames was prepared using thermomechanical treatments (TMT)．The effects of deformation ratio of cold rolling and aging temperature on the conductivity and micro hardness of C194 alloy during TMT were studied by a low DC resistance tester and a Vickers hardness tester. The results showed that the effect of aging temperature on conductivity was relatively larger than that of deformation ratio. After a series of experiments, the optimized TMT process was obtained. The strip with 1.4mm in thickness was first rolled to 1.0mm and first aged at 500°C for 2 hours, and second rolled to 0.3mm and second aged at 450°C for 2 hours, and finally rolled to 0.2mm and stress-release annealed at 330°C for one hour. The final strip products would reach to the best properties, such as, conductivity was 68.5 %IACS and microhardness was 149.9HV.
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Behrens, Bernd-Arno, Kai Brunotte, Tom Petersen, and Julian Diefenbach. "Mechanical and Thermal Influences on Microstructural and Mechanical Properties during Process-Integrated Thermomechanically Controlled Forging of Tempering Steel AISI 4140." Materials 13, no. 24 (December 17, 2020): 5772. http://dx.doi.org/10.3390/ma13245772.

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Thermomechanical treatment (TMT) describes the effect of thermal and mechanical conditions on the microstructure of materials during processing and offers possible integration in the forging process. TMT materials exhibit a fine-grained microstructure, leading to excellent mechanical properties. In this study, a two-step TMT upsetting process with intermediate cooling is used to demonstrate possibilities for a process-integrated treatment and corresponding properties. A water–air-based cooling system was designed to adjust different phase configurations by varying the target temperature and cooling rate. Four different thermal processing routes and four combinations of applied plastic strains are investigated in standardized mechanical tests and metallographic analyses. The applied TMT results in a finely structured bainitic microstructure of the investigated tempering steel AISI 4140 (42CrMo4) with different characteristics depending on the forming conditions. It can be shown that the demands of the standard (DIN EN ISO 683) in a quenched and tempered state can be fulfilled by means of appropriate forming conditions. The yield strength can be enhanced up to 1174 MPa while elongation at break is about 12.6% and absorbed impact energy reaches 58.5 J without additional heat treatment when the material is formed after rapid cooling.
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Han, Yan, Fei Zhao, Yuan Liu, and Chaowen Huang. "Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment." Metals 10, no. 1 (January 1, 2020): 67. http://dx.doi.org/10.3390/met10010067.

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In this paper, the relationships between the thermomechanical treatments (TMT), the microstructural evolution the mechanical properties of Ti17 alloy were investigated. The results indicate the coarsening behavior of lamellar α was sensitive to the aging temperature during the process of TMT. The thickness of lamellar α changed from 0.19 to 0.38 μm with an increase in the aging temperature. Moreover, both tensile properties and impact toughness vary with the thickness of lamellar α. The tensile strength increases with the increase of the thickness of lamellar α the plasticity and impact toughness the opposite trend. The quantitative investigations found that there is a linear relationship between the tensile properties and the thickness of lamellar α the tensile properties could be adjusted in the range of 1191~1062 MPa and 1163~1039 MPa to obtain ultimate tensile strength and yield strength as well as 11~16% elongation and 23~33% reduction of area by varying the thickness of lamellar α. Meanwhile, the impact toughness could be adjusted in the range of 46 ~53 J/cm2. The high correlation coefficients imply that the linear equation is reliable to describe the relationships between the mechanical properties and the thickness of lamellar α for Ti17 alloy.
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Martinova, Z., D. Damgaliev, and M. Hirsh. "The effect of room temperature pre-ageing on tensile and electrical properties of thermomechanically treated Al-Mg-Si alloy." Journal of Mining and Metallurgy, Section B: Metallurgy 38, no. 1-2 (2002): 61–73. http://dx.doi.org/10.2298/jmmb0202061m.

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A commercial Al - 0.62%Mg - 0.57%Si was thermomechanically treated (TMT). The TMT process included solution treatment, room temperature preageing, drawing (e=95%) and final ageing. The experimental data were proceeded statistically and mathematical models were derived for the alloy properties such as tensile strength, electrical conductivity and elongation of the wires during TMT. The models are used to find out the area of compromise optimal combination of the alloy properties. Higher final ageing temperature and time are required to design a TMT process for production of a long-term pre-aged wires. The influence of the room temperature preageing on the precipitation process during TMT is discussed.
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Gao, Xing Jian, Zheng Yi Jiang, Dong Bin Wei, Hui Jun Li, Si Hai Jiao, and Jing Tao Han. "Effects of Thermomechanical Treatments on Microstructure and Mechanical Behavior of HCS/LCS Bimetal." Advanced Materials Research 922 (May 2014): 183–88. http://dx.doi.org/10.4028/www.scientific.net/amr.922.183.

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A high carbon steel (HCS) and low carbon steel (LCS) bimetal was fabricated by centrifugal composite casting. Two different thermomechanical treatments (TMT1 and TMT2) were employed to improve the mechanical properties of the bimetal. TMT1 process includes 60% of overall reduction by hot compression with temperatures of 1100 and 800oC, respectively. While TMT2 process involves 60% of overall reduction using the two-step deformation method, which is a combination of non-isothermal compression cooling from 1100 to 800oC and isothermal compression at 800oC. The flow stress behavior, microstructural evolution and microhardness variation were analysed. Experimental results show that both TMT processes contributed to the improvement in mechanical properties resulting from a refinement of the grain size and an increase of density of pearlitic lamella in HCS layer. However, TMT2 process gave a better efficiency and a more significance in improvement of properties with the evidence of the same overall reduction leading to a higher microhardness.
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Ahmad, Sazzad, and Wahidur Rahman Sajal. "An Experimental Investigation of Relationship between surface Hardness and Strength of Locally produced TMT 500W bar in Bangladesh." Journal of Engineering Science 11, no. 1 (October 5, 2020): 113–22. http://dx.doi.org/10.3329/jes.v11i1.49554.

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The high-strength mild steel bars (usually low carbon steel) are widely used for structural purposes throughout the world including Bangladesh. The strength of these deformed barsis measured through a sample decimation process via Universal Testing Machine (UTM), after which the broken pieces are discarded as scrap for recycling. Therefore, measuring the hardness of steel could be a good indication of strength and will involve less sample and short time for testing. The strength–hardness relationship for steel and cast iron is well defined. However, the TMT 500W deformed bar using in Bangladesh has different structural phenomena due to its unique fabrication technique. Therefore, it is necessary to understand how the strength varies with hardness for this grade of steel. The current research aims to explore the hardness–strength relationship for TMT (Thermomechanical Treatment) 500W bar as an alternate of the tensile test to minimize the wastage, cost and time of testing. Several TMT 500W bars were collected from the local market and measured the Rockwell Hardness B (HRB), strength and other relevant macroscopic/microscopic parameters. Finally, two empirical relationships of yield and tensile strength have been established using rim hardness, core hardness, and rim thickness data. The actual strength data shows a good agreement with present findings and the result variation is found less than 2% and 3% in the case of yield strength and tensile strength respectively. Journal of Engineering Science 11(1), 2020, 113-122
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Tapar, Archit Vinod, Somraj Bhattacharjee, and Jitender Kumar. "Jindal panther: the creation of a brand." Emerald Emerging Markets Case Studies 11, no. 2 (July 6, 2021): 1–21. http://dx.doi.org/10.1108/eemcs-08-2020-0291.

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Learning outcomes The case focuses on the importance of the brand-building process, which takes place in B2B companies. Commodity companies focus a lot on the sales and distribution aspect of their marketing strategies but do not emphasize the importance of developing their brands. At the end of the discussion, the participants would be able: to examine the steps involved in conceptualizing the brand identity for an existing product in a highly competitive B2B market, as per Kapferer’s Brand Identity Matrix. To understand the steps involved in the journey of internal and external brand-building processes in B2B. To analyze the various challenges and issues faced by large organizations dealing in the metals and commodity business. Case overview/synopsis The case discusses a marketing challenge faced by Jindal Steel and Power Limited (JSPL) in launching a new brand of thermomechanical treatment (TMT) products in the market. Traditionally, the company had focused on the sales and distribution aspect of their marketing strategies but did not emphasize the importance of developing their brands. This case is based upon the challenges faced in the creation of a new brand identity for JSPL’s TMT products by the protagonist, Mr Paras Sharma (who is the brand custodian and manager in this case). Complexity academic level Postgraduate/Masters in Business Administration (MBA), Masters in Management Studies, Executive MBA. Supplementary materials Teaching Notes are available for educators only. Subject code CSS 8: Marketing.
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Sao, Satish kumar sao. "OPTIMIZATION OF PROCESS PARAMETERS IN ROLLING OPERATION FOR MANUFACTURING OF THERMOMECHANICALLY TREATED BAR USING MINITAB AND MATLAB SOFTWARE." Journal of Manufacturing Engineering 17, no. 1 (March 1, 2022): 020–24. http://dx.doi.org/10.37255/jme.v17i1pp020-024.

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At low cost, designing high-quality products and process is a challenge to the engineers. For the manufacturing of TMT bars, the critical quality parameter is yield strength. This study aims to choose the optimal variables that will achieve the needed yield strength. In this research work, the use of the Taguchi Method and the concept of DOE (Design of experiment) for optimization of Thermo Mechanical Treatment Process parameter. In the plant, readings have been taken by Taguchi Method and by using MINITAB and MATLAB Software to find optimal combination factors. For optimizing the process parameters ANOVA, S/N ratio (Signal to noise ratio), and orthogonal array have been utilized. Optimum values have been obtained with the help of graphs as well as a confirmation experiment.
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Ning, Yong Quan, Ze Kun Yao, Xing Hua Xie, and Hong Zhen Guo. "Investigation on Thermomechanical Treatment of PM FGH4096 Superalloy." Advanced Materials Research 97-101 (March 2010): 255–59. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.255.

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Thermomechanical treatment (TMT) of PM FGH4096 superalloy were carried out to futher improve the mechanical strength and refine the γ’ particle, and this processing route as follows: near-isothrmal forged at deformation temperature of 1130°C and strain rate of 0.1 s-1, followed by subsequence oil quenching, and then held at 760°C for 16 h. OM, SEM and TEM were used to investigate the microstructure of TMTed alloy. It was found that the advanced mechanical strength originated form the dispersion strengthening of fine γ’ particle and stain hardening reserved from deformation after TMT. But TMT had no obvious effect on improving the chemical segregation of original materials. Fracture analysis of TMTed alloy shown that cracks origined from Ti and Nb chemical segregation and presented rose-pattern and ladder-pattern at room temperature and 750°C temperature.
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Barani, Araz Ardehali, and Dirk Ponge. "Optimized Thermomechanical Treatment for Strong and Ductile Martensitic Steels." Materials Science Forum 539-543 (March 2007): 4526–31. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.4526.

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In this study the effect of thermomechanical treatment on the microstructure of austenite and martensite and the mechanical properties of a medium carbon silicon chromium spring steel with different levels of impurities is investigated. Results are presented for conventional heat treatment and for thermomechanical treatment (TMT). Compared to conventionally heat treated samples austenite deformation improves strength and ductility. Thermomechanically treated samples are not prone to embrittlement by phosphorous. TMT influences the shape and distribution of carbides within the matrix and at prior austenite grain boundaries. It is shown that utilization of TMT is beneficial for increasing the ultimate tensile strength to levels above 2200 MPa and at the same time maintaining the ductility obtained at strength levels of 1500 MPa by conventional heat treatment. The endurance limit is increased and embrittlement does not occur.
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Dissertations / Theses on the topic "Thermomechanical treatment (TMT) process"

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林繼棟 and Kai-tung George Lam. "A novel thermomechanical treatment process for enhancing gamma fibre texture recrystallisation components." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576507.

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Lam, Kai-tung George. "A novel thermomechanical treatment process for enhancing gamma fibre texture recrystallisation components." Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42576507.

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Ramesh, Anand. "Prediction of process-induced microstructural changes and residual stresses in orthogonal hard machining." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/18842.

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Ballat-Durand, Dorick. "Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2499.

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Cette étude s’inscrit dans une démarche de réduction des coûts dus à l’utilisation croissante d’alliages de titane pour des applications structurelles, via des procédés d’assemblage à l’état solide, comme le soudage par friction linéaire (LFW). Cependant, les chargements thermomécaniques transmis au matériau au cours du LFW engendrent d’importantes transformations microstructurales pouvant affecter sévèrement la durabilité mécanique de l’assemblage. Ces transformations sont dépendantes à la fois de l’histoire thermomécanique du matériau et de ses éléments d’alliage. Ainsi, la compréhension des mécanismes régissant ces transformations en lien avec l’impact des configurations procédé et/ou de traitements thermiques sur ces dernières apparaît comme nécessaire pour des applications industrielles. Les travaux présentés dans ce document se focalisent sur la caractérisation/optimisation microstructurale de deux joints obtenus à partir de deux alliages sensiblement différents : le β-métastable Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) et le quasi-α Ti-6Al-2Sn-4Zr-2Mo (Ti6242). Une analyse détaillée des mécanismes impactant les transformations microstructurales et la résorption des défauts sera exposée en s’appuyant sur des études multi-techniques et multi-échelle. Ces campagnes expérimentales ont conduit à l’élaboration d’un traitement thermique permettant d’obtenir des comportements mécaniques quasi-homogènes au sein des structures soudées. De plus, les effets des principaux paramètres de LFW sur les microstructures ont été déterminés fournissant ainsi à la littérature des données essentielles pour la dissipation des défauts et le contrôle des textures de déformation
The present study follows up two major development axes focusing on the increase in use of Ti-alloys for structur applications through the use of solid-state joining processes such as Linear Friction Welding (LFW). Yet, the therm mechanical loads involved during LFW result in remarkable microstructural changes deeply affecting the associate mechanical performances. These changes are concomitant with the thermo-mechanical processing history and the alloyin compositions of the welded Ti-alloys. Hence, a correct understanding of the microstructure transformation mechanism induced by LFW is required as well as identifying the influence of the process conditions and/or complementary he treatments on these changes. This dissertation is endeavored at characterizing and optimizing the microstructures of two butt-joints of significantl different Ti-alloys: the ß-metastable Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) and the near-α Ti-6Al-2Sn-4Zr-2Mo (Ti6242). The extensive microstructural investigations will focus on identifying the mechanisms responsible for transforming the microstructures and for the formation/resorption of welding defects. These investigations will combine temperatur measurements, micrographs, crystallographic/chemical analysis, hardness/tensile tests. The resulting comprehension the microstructural changes will enable designing a heat treatment capable of a quasi-homogenization of the tensil behavior across the assemblies. Moreover, identifying the effects of the main process parameters on the microstructur will provide the literature with valuable insights on tailoring the process duration, the recrystallization/textur development, and the defect removal
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Books on the topic "Thermomechanical treatment (TMT) process"

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. Process Modelling of Metal Forming and Thermomechanical Treatment. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4.

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Boër, C. R. Process Modelling of Metal Forming and Thermomechanical Treatment. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986.

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Croon, Ingemar. The Tigney steam explosion process: Experiences from Europe. Edmonton, Alta: Canadian Forestry Service, Northern Forestry Centre, 1986.

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Wong, Al. Review of chemical products produced from the Tigney exploded aspenwood process. Edmonton, Alta: Canadian Forestry Service, Northern Forestry Centre, 1986.

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International, Conference on Thermal Process Modelling and Computer Simulation (2nd 2003 Nancy France). 2nd International Conference on Thermal Process Modelling and Computer Simulation: Proceedings : Nancy, France, March 31-April 2, 2003. Les Ulis, France: EDP Sciences, 2004.

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R, Boër C., ed. Process modelling of metal forming and thermomechanical treatment. Berlin: Springer-Verlag, 1986.

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Process Modelling of Metal Forming and Thermomechanical Treatment. Springer, 2011.

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R, Boer C., ed. Process modelling of metal forming and thermomechanical treatment. Springer, 1986.

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ICTPMCS - 2nd International Conference on Thermal Process Modelling and Compute Simulation (Nancy, France March 31-April 2, 2003) (Journal De Physique Proceedings, IV). EDP Sciences, 2003.

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Book chapters on the topic "Thermomechanical treatment (TMT) process"

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Modelling of Thermomechanical Treatment." In Process Modelling of Metal Forming and Thermomechanical Treatment, 351–408. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_7.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Preface." In Process Modelling of Metal Forming and Thermomechanical Treatment, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_1.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Mathematical Modelling." In Process Modelling of Metal Forming and Thermomechanical Treatment, 4–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_2.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Physical Modelling." In Process Modelling of Metal Forming and Thermomechanical Treatment, 109–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_3.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Modelling of Forging." In Process Modelling of Metal Forming and Thermomechanical Treatment, 141–288. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_4.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Modelling of Rolling." In Process Modelling of Metal Forming and Thermomechanical Treatment, 289–316. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_5.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Modelling of Drawing." In Process Modelling of Metal Forming and Thermomechanical Treatment, 317–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_6.

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Böer, Claudio R., Nuno M. R. S. Rebelo, Hans A. B. Rydstad, and Günther Schröder. "Outlook." In Process Modelling of Metal Forming and Thermomechanical Treatment, 409–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82788-4_8.

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Eliseev, Alexander A., Tatiana A. Kalashnikova, Andrey V. Filippov, and Evgeny A. Kolubaev. "Material Transfer by Friction Stir Processing." In Springer Tracts in Mechanical Engineering, 169–88. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_8.

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AbstractMechanical surface hardening processes have long been of interest to science and technology. Today, surface modification technologies have reached a new level. One of them is friction stir processing that refines the grain structure of the material to a submicrocrystalline state. Previously, the severe plastic deformation occurring during processing was mainly described from the standpoint of temperature and deformation, because the process is primarily thermomechanical. Modeling of friction stir welding and processing predicted well the heat generation in a quasi-liquid medium. However, the friction stir process takes place in the solid phase, and therefore the mass transfer issues remained unresolved. The present work develops the concept of adhesive-cohesive mass transfer during which the rotating tool entrains the material due to adhesion, builds up a transfer layer due to cohesion, and then leaves it behind. Thus, the transfer layer thickness is a clear criterion for the mass transfer effectiveness. Here we investigate the effect of the load on the transfer layer and analyze it from the viewpoint of the friction coefficient and heat generation. It is shown that the transfer layer thickness increases with increasing load, reaches a maximum, and then decreases. In so doing, the average moment on the tool and the temperature constantly grow, while the friction coefficient decreases. This means that the mass transfer cannot be fully described in terms of temperature and strain. The given load dependence of the transfer layer thickness is explained by an increase in the cohesion forces with increasing load, and then by a decrease in cohesion due to material overheating. The maximum transfer layer thickness is equal to the feed to rotation rate ratio and is observed at the axial load that causes a stress close to the yield point of the material. Additional plasticization of the material resulting from the acoustoplastic effect induced by ultrasonic treatment slightly reduces the transfer layer thickness, but has almost no effect on the moment, friction coefficient, and temperature. The surface roughness of the processed material is found to have a similar load dependence.
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Kedia, Bipin, and Ilangovan Balasundar. "Titanium Alloys: Thermomechanical Process Design to Achieve Superplasticity in Bulk Material." In Titanium Alloys - Recent Progress in Design, Processing, Characterization, and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108463.

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Titanium alloys subjected to suitable thermomechanical processing (TMP) schedules can exhibit superplasticity. Most studies on superplasticity of titanium alloys are directed to sheet materials while studies on bulk materials are rather limited. Bulk Superplastic materials require lower load for forging aeroengine components. It further facilitates forming using non-conventional processes such as superplastic roll forming (SPRF). Multi axial forging (MAF), is employed here to achieve bulk superplasticity by imparting large strain without any concomitant change in external dimension. A comparison between uniaxial and MAF with respect to strain, strain path, initial microstructure and heat treatment was carried out to ascertain the microstructure refinement in Ti-6Al-4V alloy. A fine-grained structure was obtained after 3 cycles of MAF followed by static recrystallization at 850oC. Grain boundary sliding was observed in identified processing domain along with strain rate sensitivity (SRS) of 0.46 and maximum elongation of 815%. Validation of established ther¬momechanical sequence on a scaled-up work piece exhibited 640% elongation in domain (T = 820oC, ε ̇ = 3 x 10-4/s) which indicated that the established TMP scheme can be used on a reliable and repeatable basis to achieve superplasticity in bulk material.
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Conference papers on the topic "Thermomechanical treatment (TMT) process"

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Hernández, Rebeca, Marta Serrano, Andrea García-Junceda, Elvira Oñorbe, and Javier Vivas. "Improvement of High Temperature Creep Strength of Conventional Grade 91 Steel by Thermomechanical Treatments." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93148.

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Abstract The study of the enhanced creep strength of conventional ferritic-martensitic (F/M) grade 91 steel by a thermomechanical treatment (TMT) to increase the precipitation of MX particles in the matrix was performed. Creep properties were evaluated by tests at constant load at temperatures that varied from 600 °C to 700 °C with different levels of stress for both steels: T91 and T91-TMT. The creep curves and main parameters for both steels in the different conditions were analysed. Results show a great improvement of creep strength of the T91 after the thermomechanical treatment in comparison with the conventional steel. T91-TMT presents a rupture life significantly higher than T91 and a decrease of the values of the minimum creep rate. An increase of the density of MX precipitates in the matrix of the T91-TMT due to the thermomechanical treatment in comparison with T91 can be also observed. A change in the fractography was also detected. T91-TMT specimens showed signs of brittle fracture instead of the ductile fracture, with the common necking effect detected in the T91.
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Tugiman, Farida Ariani, F. Perinta Tarigan, T. Istaula Febrian, H. Alwizar Harahap, Ivan Tamayo, and Abdi M. Manurung. "Design and the Analysis of Force, Torque, and Tension of Twin Roll for Thermomechanical Treatment Process." In The International MIPAnet Conference on Science and Mathematics (IMC-SciMath). SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010181400002775.

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Yamamoto, Yukinori, Xinghua Yu, and Sudarsanam Suresh Babu. "Improvement of Creep Performance of Creep Strength Enhanced Ferritic (CSEF) Steel Weldments Through Non-Standard Heat Treatments." In ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/etam2014-1009.

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Significant improvement of creep-rupture life was observed in Grade 91 (modified 9Cr-1Mo) steel weldments when a non-standard heat-treatment was applied prior to welding. A lower temperature pre-weld tempering (LTT) than the typical heat-treatment resulted in a complete dissolution of M23C6 carbides in the fine-grained heat affected zone (FGHAZ) during welding, which allowed re-precipitation of the M23C6 as strengthening carbides after post-weld heat treatment. However, the LTT also raised the ductile-brittle transition temperature of the base metal above room temperature. A thermo-mechanical treatment (TMT) has been proposed in the present study as a way of balancing the need for improved creep properties in the weld region and an acceptable level of room temperature ductility in the base metal. Aus-forging and subsequent aus-aging promotes MX formation prior to martensitic transformation which effectively increases the creep resistance, even in the FGHAZ. The application of the standard tempering after the TMT process improves the room temperature ductility without losing the advantage of improved strength. Preliminary results indicate a successful improvement of the cross-weld creep properties of the TMT sample similar to the LTT sample. Paper published with permission.
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Fazeli Nahrkhalaji, A. R., and E. Sharifi Tashnizi. "Modeling and Studying the Impacts of Effective Parameters on the Parts Hardness During the Tube Spinning Process by the Design of Experiments." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68520.

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The spinning process is recognized as an effective process for fabrication of thin wall cylindrical parts with precision tolerances. In this paper, the influences of major parameters of thermomechanical tube spinning process such as preform’s thickness, percentage of thickness reduction, mandrel rotational speed, feed rate, solution treatment time and aging treatment time on hardness for fabricating 2024 aluminum spun tubes using the design of experiments (DOE) are studied. Experimental data is analyzed by analysis of variance and an empirical model. It is found that, increasing the mandrel rotational speed and percentage of thickness reduction in addition to decreasing in aging treatment time causes increasing in hardness.
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Batista, Gilmar Zacca, Leonardo Naschpitz, Eduardo Hippert, and Ivani de Souza Bott. "Induction Hot Bending and Heat Treatment of 20” API 5L X80 Pipe." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10089.

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The present work discusses the effect of the induction hot bending process on the microstructure and the mechanical properties of an API 5L X80, 20” pipe produced by the UOE process. The key characteristic of the pipe was the manufacturing process of the steel plate, involving thermomechanical controlled rolling without accelerated cooling. The pipe bending was carried out applying local induction heating followed by water quenching and a further temper heat treatment which was applied to the curved section. The methodology of analysis compared the curved section with the original body pipe (tangent end), taking into account dimensional analysis, microstructural evaluation and mechanical tests which included Charpy-V impact, tensile and microhardness. A significant microstructural change and decrease, not only in the transition temperature, but also in the yield strength, occurred after induction bending. This reduction resulted in a tensile strength below the standard requirements. The subsequent tempering heat treatment applied to the curved section produced an increase in the yield strength to achieve the API 5L requirements for this class of steel.
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Sharifi Tashnizi, E., and A. R. Fazeli Nahrekhalaji. "The Synchronic Influence of the Effective Parameters on the External Surface Roughness and Changes of the External Diameter in Tube Spinning Process Using Design of Experiments and Optimizing the Process." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68519.

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Tube spinning process is considered to be a very effective way for fabricating a long thick-walled part. In this research, the influences of major parameters of the thermomechanical tube spinning process such as preform thickness, percent of thickness reduction, rotational speed, feed rate, solution and aging treatment time on the external surface roughness and changes of the external diameter for fabricating of 2024 aluminum spun tubes using design of experiments is studied. The effect of the basic input parameters on the external surface roughness and changes of the external diameter was investigated synchronically by designing the experiments. After conducting the experiments, results are analyzed by variance analysis and by obtaining predicted mathematic models. Finally, by using these models and multivariate optimization, input parameters for optimum production are achieved.
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Ye, Chang, and Gary J. Cheng. "Fatigue Performance Improvement by Dynamic Strain Aging and Dynamic Precipitation in Warm Laser Shock Peening of AISI 4140 Steel." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34301.

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Warm laser shock peening (WLSP) integrates the advantages of laser shock peening and thermal-mechanical treatment (TMT) to improve material fatigue performance. Compared to traditional laser shock peening (LSP), warm laser shock peening, i.e. LSP at elevated temperature, leads to better performance in many aspects. WLSP can induce nanoscale precipitations by dynamic precipitation and high density dislocation by dynamic strain aging (DSA), resulting in higher surface strength, which is beneficial for fatigue life improvement. Due to pinning of dislocation structure by nanoscale precipitates, and the pinning of dislocation structure by Cottrell atmosphere, or the DSA effect, stability of the dislocation arrangement is significantly increased and the residual stress stability improved. In this study, AISI 4140 steel is used to evaluate WLSP process. It is concluded that the higher residual stress stability and higher surface strength caused by dynamic precipitation and DSA in WLSP leads to fatigue life improvement.
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Liu, Chang-Jun, Shuang Zhou, Jian-Ping Tan, and Hao-Yu Zhang. "Research on Reheat Cracking Criterion of CGHAZ in 2.25Cr1Mo0.25V Steel." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84583.

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During the final post welding heat treatment (PWHT), residual stress relieves gradually with the accumulation of creep strain. However, reheat cracking with intergranular characteristic will occur when grain boundary cannot accommodate this kind of strain for some special steel welding, such as the welding coarse grained heat affected zone (CGHAZ) of 2.25Cr1Mo0.25V steel. Based on the principle of stress relaxation similar to the process of PWHT, two methods are applied to study the strain criterion of reheat cracking. Stress relaxation testing is performed on CGHAZ materials prepared by Gleeble thermomechanical simulator. The critical strain is calculated using the relationship between stress reduction and creep deformation. Self-loaded notched C-ring specimens are tested taken from the welding structure, coupled with finite element modeling and multiaxial creep coefficient to determine the critical strain. The results show that there is a large numerical difference between the critical strains from two methods. The possible reasons for the difference are given. Regarding the PWHT as a service process, whether the critical strain values obtained exceed the strain limits in ASME-NH is discussed.
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Elboujdaini, M., and R. W. Revie. "Performance of Pipeline Steels in Sour Service." In 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-127.

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The demand for steel for the production of pipelines to transport gas and oil containing hydrogen sulphide prompted the development of steel that is resistant to hydrogen induced cracking (HIC). During the past two decades, combined research efforts in the areas of product and process metallurgy have made it possible to satisfy most of the main requirements for grades X-42 and X-60 microalloyed steel for mildly acidic (pH = 5) H2S environments. Building on the experience acquired in the area of microalloyed steel for a mildly acidic (pH ∼ 5) H2S environment, the industry launched a program to develop steel that would satisfy new requirements for H2S-resistant pipelines under NACE conditions (TM0177, pH∼3). In order to develop these steels, it was necessary to define qualitatively and quantitatively the specific effects on H2S resistance of the multiple intrinsic parameters of the product itself as well as those resulting from the process. In this paper, data will be presented that have made it possible to relate the HIC performance of steels to chemical content, inclusion levels and thermomechanical treatment parameters.
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Reichel, Thilo, Vitaliy Pavlyk, Jochem Beissel, Ivan Aretov, and Stelios Kyriakides. "On the Collapse Pressure of Impanded Large Diameter Pipe (JCO-C)." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90735.

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Current manufacturing technology for large diameter pipe, such as the UOE process, is known to result in pipe with reduced collapse pressure compared to a seamless one of the same steel grade and D/t. It has recently been demonstrated [1,2] that such deficient performance can be alleviated by finishing longitudinally welded pipe by compression. A newly developed cold sizing press, called Impander®, is used to produce pipe with reduced ovality, reduced residual stresses and increased compressive yield strength. The combination of these factors can lead to a significant increase in the collapse pressure of the pipe. The paper will review experimental and analytical results that demonstrate the improved collapse pressure of pipes manufactured by it. This improved performance was confirmed in a full-scale collapse experiment on a pipe finished by impansion of 1.1%. The test showed perfect agreement with the modelling. The collapse pressure was 37% higher than current design codes allow. Additional work has been performed aimed at evaluating the effect of low temperature heat treatment on the collapse pressure. A full-scale collapse test on impanded and heat-treated pipe has shown that a significant additional enhancement in collapse pressure results from the heat treatment. The paper will discuss the thermomechanical causes of these enhancements of the collapse pressure.
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You might also be interested in the extended bibliographies on the topic 'Thermomechanical treatment (TMT) process' for particular source types:
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