Relevant bibliographies by topics / Retained austenite transformation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Retained austenite transformation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Retained austenite transformation"

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Haidemenopoulos, G. N., M. Grujicic, G. B. Olson, and Morris Cohen. "Transformation microyielding of retained austenite." Acta Metallurgica 37, no. 6 (1989): 1677–82. http://dx.doi.org/10.1016/0001-6160(89)90134-x.

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Kawasaki, Yoshiyasu, Yuki Toji, Yokota Takeshi, and Yoshimasa Funakawa. "Effects of Tensile Testing Temperature on Mechanical Properties and Deformation Behavior in Medium Mn Steels." Materials Science Forum 1016 (January 2021): 1823–29. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1823.

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In single-phase austenitic steels, the optimum deformation temperature in the tensile test to obtain high tensile strength-elongation balance (TS×El) and work hardening rate (dσ/dε) depends on control of the stability of austenite. In order to clarify the effects of the deformation temperature in complex phase steels containing austenite, in this study, the effects of the tensile testing temperature on mechanical properties and deformation behavior were investigated in detail using steel A and steel B with a chemical composition of 0.15C-0.5Si-5.0Mn (wt%). Steels A and B consisted of ferrite a
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Hell, Jean Christophe, Moukrane Dehmas, Guillaume Geandier, et al. "Influence of the Austempering Temperature on the Microstructure and Crystallography of a Carbide-Free Bainitic Steel." Solid State Phenomena 172-174 (June 2011): 797–802. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.797.

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We elaborated two carbide-free bainitic steels with different microstructures through specific heat treatments and alloy design. EBSD analysis was used to point out major differences in these microstructures. In-situ characterizations of the bainitic transformation were performed by high energy synchrotron diffraction to go further into the study of each phase characteristics. The elaborated microstructures exhibited various phase fractions of bainitic ferrite, retained austenite and blocks of martensite and retained austenite. Moreover, the volume fraction of retained austenite increased with
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Zrník, Jozef, O. Muránsky, Petr Lukáš, Petr Šittner, and Z. Nový. "In Situ Neutron Diffraction Analysis of Phase Transformation Kinetics in TRIP Steel." Materials Science Forum 502 (December 2005): 339–44. http://dx.doi.org/10.4028/www.scientific.net/msf.502.339.

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The precise characterization of the multiphase microstructure of low alloyed TRIP steels is of great importance for the interpretation and optimisation of their mechanical properties. In-situ neutron diffraction experiment was employed for monitoring of conditioned austenite transformation to ferrite, and also for retained austenite stability evaluation during subsequent mechanical loading. The progress in austenite decomposition to ferrite is monitored at different transformation temperatures. The relevant information on the course of transformation is extracted from neutron diffraction spect
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Yin, Yun Yang, Fang Fang, Wei Chen, and Yong Tao Fu. "Effect of Thermomechanical Parameters on the Microstructure and Retained Austenite Characteristics in a Hot-Rolled TRIP Steel." Advanced Materials Research 295-297 (July 2011): 1294–99. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1294.

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The influence of thermomechanical parameters on the microstructure and retained austenite characteristics in a hot rolled Al-Si-Mn transformation induced plasticity (TRIP) steel based on dynamic transformation of undercooled austenite was investigated, in an effort to produce a desired microstructure and better control retained content. The results show that strain rate had a minor effect on the microstructure, but the volume fraction of retained austenite decreased with increasing strain rate. Decreasing coiling temperature caused a decrease in volume fraction of retained austenite and decrea
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Grajcar, Adam, Aleksandra Kozłowska, Krzysztof Radwański, and Adam Skowronek. "Quantitative Analysis of Microstructure Evolution in Hot-Rolled Multiphase Steel Subjected to Interrupted Tensile Test." Metals 9, no. 12 (2019): 1304. http://dx.doi.org/10.3390/met9121304.

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A quantitative analysis of the microstructure evolution in thermomechanically processed Si-Al multiphase steel with Nb and Ti microadditions was performed in the study. The tendency of strain-induced martensitic transformation of retained austenite was analyzed during a tensile test interrupted at incremental strain levels. Optical micrographs and electron backscatter diffraction (EBSD) maps were obtained at each deformation step. The quantitative analysis of the martensitic transformation progress as a function of strain was performed. The results showed that the stability of retained austeni
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Matsuda, Hiroshi, Hisata Noro, Yasunobu Nagataki, and Yoshihiro Hosoya. "Effect of Retained Austenite Stability on Mechanical Properties of 590MPa Grade TRIP Sheet Steels." Materials Science Forum 638-642 (January 2010): 3374–79. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.3374.

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Industrial low alloy TRIP sheet steels contain blocky and lath-shaped retained austenite. In the present study, transformation behaviour of blocky and lath-shaped retained austenite during straining was investigated to clarify its effect on mechanical properties. Two types of TRIP steels containing almost the same amount but the different morphology of retained austenite were used. A steel containing large amount of lath-shaped retained austenite exhibits superior ductility, and sustains high work-hardenability in a high strain region. On the contrast, a steel containing large amount of blocky
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Landesberger, Martin, Robert Koos, Michael Hofmann, et al. "Phase Transition Kinetics in Austempered Ductile Iron (ADI) with Regard to Mo Content." Materials 13, no. 22 (2020): 5266. http://dx.doi.org/10.3390/ma13225266.

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The phase transformation to ausferrite during austempered ductile iron (ADI) heat treatment can be significantly influenced by the alloying element Mo. Utilizing neutron diffraction, the phase transformation from austenite to ausferrite was monitored in-situ during the heat treatment. In addition to the phase volume fractions, the carbon enrichment of retained austenite was investigated. The results from neutron diffraction were compared to the macroscopic length change from dilatometer measurements. They show that the dilatometer data are only of limited use for the investigation of ausferrit
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Godet, S., J. C. Glez, Y. He, J. J. Jonas, and P. J. Jacques. "Grain-scale characterization of transformation textures." Journal of Applied Crystallography 37, no. 3 (2004): 417–25. http://dx.doi.org/10.1107/s0021889804007320.

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Orientation relationships during the austenite-to-ferrite (γ-to-α) phase transformation were investigated using electron back-scattered diffraction (EBSD) on a bainitic steel containing retained austenite. The steel was hot rolled within the austenite phase field, but below the `no-recrystallization' temperature, to two different strains. The observed orientation relationships between the bainite and retained austenite are expressed in Rodrigues–Frank space. The exact Kurdjumov–Sachs relation was never found. The local spread of orientation in the parent austenite (owing to deformation) is see
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Shui, Heng Yong, Di Tang, and Qiang Liu. "Study on Transformation Behavior of Retained Austenite in TRIP Steel." Advanced Materials Research 788 (September 2013): 100–104. http://dx.doi.org/10.4028/www.scientific.net/amr.788.100.

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The microstructures of CR600TR steel were characterized using optical metallography, SEM, TEM and EBSD techniques, especially the transformation behavior of retained austenite and fracture mechanism of TRIP steel under stress-strain were studied in detail. It is discovered that there is marked selectivity for those retained austenite grains in their transition sequences: they are even dependent on the extension paths of stress-strain in steel and that curvatures of grain-boundaries which the retained austenite grains lie in.
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Dissertations / Theses on the topic "Retained austenite transformation"

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Mark, Alison Fiona Lockie. "Microstructural effects on the stability of retained austenite in transformation induced plasticity steels." Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/960.

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Adams, Derrik David. "Characterization of the Factors Influencing Retained Austenite Transformation in Q&P Steels." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8425.

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Formable Advanced High-Strength Steels (AHSS) have a unique combination of strength and ductility, making them ideal in the effort to lightweight vehicles. The AHSS in this study, Quenched and Partitioned 1180, rely on the Transformation Induced Plasticity (TRIP) effect, in which retained austenite (RA) grains transform to martensite during plastic deformation, providing extra ductility via the transformation event. Understanding the factors involved in RA transformation, such as local strain and grain attributes, is therefore key to optimizing the microstructure of these steels. This research
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Gibbs, Parker Kenneth. "Strain Path Effect on Austenite Transformation and Ductility in TBF 1180 Steel." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7127.

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TBF 1180 steel was studied under various conditions focusing on the correlation of ductility and amount of retained austenite. Samples were prepared from sheet stock and then strained using limiting dome height tooling (LDH), a standard uniaxial test frame, and a tensile stage for use in an electron microscope. The steel was observed in plane, biaxial, and uniaxial strain to determine its effect on retained austenite transformation and ultimately, ductility. Retained austenite was observed using a scanning electron microscope (SEM) equipped with an electron backscatter detector (EBSD) to disti
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Cramer, Jeffrey Grant. "Strain Path Effect on Austenite Transformation and Ductility in Q&P 1180 Steel." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6650.

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The ductility of Q&P 1180 steel was studied with regard to retained austenite transformation under different strain paths. Specimens were tested in uniaxial tension in a standard test frame as well as in situ in the scanning electron microscope (SEM). Then digital image correlation (DIC) was used to compute the effective strain at the level of the individual phases in the microstructure. Stretching experiments were also performed using limiting dome height (LDH) tooling, where specimens were strained in both biaxial and plane strain tension. The experiments were done incrementally, for each
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Chelladurai, Isaac. "Characterization of Phase Transformation and Twin Formation in Automotive Sheet Metal Alloys to Quantify and Understand Their Impact on Ductility." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8628.

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The motivation to use lightweight materials in the construction of the automotive structure is the resultant increased fuel efficiency. However, these materials possess certain drawbacks that make it challenging to adopt them into current automobile manufacturing processes. In this dissertation the microstructural response observed in a magnesium alloy, AZ31, and an advanced high strength steel alloy, QP1180, to uniaxial deformation is analyzed and the results are presented. In AZ31 the required slip modes are not activated at room temperature leading to its low ductility at room temperature.
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Katemi, Richard Jackson [Verfasser], Franz [Akademischer Betreuer] Hoffmann, Franz [Gutachter] Hoffmann, and Udo [Gutachter] Fritsching. "Influence of Carbonitriding Process on Phase Transformation during Case Hardening, Retained Austenite and Residual Stresses / Richard Jackson Katemi ; Gutachter: Franz Hoffmann, Udo Fritsching ; Betreuer: Franz Hoffmann." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/1199003603/34.

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Bedekar, Vikram. "Nanostructural Evolution of Hard Turning Layers in Carburized Steel." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366195383.

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Ferrer, Modesto Hurtado. "Estudo das transformações de fase de aços TRIP ao Si-Mn microligados com Nb." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082003-115928/.

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Estudou-se a cinética das transformações de fase em resfriamento contínuo e em tratamentos isotérmicos de cinco ligas de aços TRIP microligados com Nb, contendo teores variáveis de Mn e Si, através de ensaios dilatométricos, de caracterização morfológica dos produtos de transformação e de cálculos termodinâmicos e simulações numéricas usando os programas Thermocalc ® e Dictra®. Foram determinados os diagramas RC para a transformação da austenita, e foi estudada a influência da precipitação de ferrita pró-eutetóide e de bainita na fração volumétrica de austenita retida. Através dos diagramas de
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Arlazarov, Artem. "Évolution des microstructures et lien avec les propriétés mécaniques dans les aciers 'Médium Mn'." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0086/document.

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Lors d’un recuit inter-critique d’un acier dit « Medium Manganèse », dont la teneur en Mn est située entre 4 et 12 %, avec une microstructure initiale complètement martensitique, la formation de l’austénite obéit à un mécanisme spécifique qui porte le nom d'ART - « Austenite Reverted Transformation » (transformation inverse de l’austénite). L’objectif de ce travail de thèse était d’étudier et de modéliser les évolutions microstructurales en lien avec les propriétés mécaniques lors d’un recuit ART. Il a été déterminé que la microstructure finale se compose de phases de nature (ferrite, austénit
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Almeida, Alan Barros de. "Detecção da transformação da austenita retida por deformação plástica em aços para gasodutos classe API 5L X80 através de medidas magnéticas." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-17102014-120751/.

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O presente trabalho avaliou o efeito de tratamentos térmicos ou diferentes graus de deformação plástica na transformação da austenita do microconstituinte AM de uma chapa de aço alta resistência baixa liga (ARBL) classe API 5L X80 usada para gasodutos. A chapa tem espessura de 19 mm e passaria pelo processo de conformação UOE, mas a deformação foi realizada por laminação a frio, a temperatura ambiente, com reduções de 5 a 20%. O propósito foi compreender melhor o microconstituinte AM, explorar a transformação martensítica induzida por deformação (SIMT) e a decomposição austenítica por tratamen
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Book chapters on the topic "Retained austenite transformation"

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Pereloma, Elena, Azdiar Gazder, and Ilana Timokhina. "Retained Austenite: Transformation-Induced Plasticity." In Encyclopedia of Iron, Steel, and Their Alloys. CRC Press, 2016. http://dx.doi.org/10.1081/e-eisa-120049200.

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"Postcarburizing Thermal Treatments." In Carburizing. ASM International, 1999. http://dx.doi.org/10.31399/asm.tb.cmp.t66770171.

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Abstract This chapter familiarizes readers with tempering and refrigeration treatments and their effect on case-carburized parts. It explains how tempering makes such parts easier to machine, more structurally and dimensionally stable, and more durable in certain applications. It identifies key process parameters and provides test data showing how they affect hardness, yield strength, bending and contact fatigue, and fracture toughness. It also addresses potential problems stemming from process-related factors such as the presence of hydrogen and the effects of aging and grinding. In regard to refrigeration, the chapter explains that it is not uncommon for subzero treatments to be included in the production of carburized parts whether as a standard procedure or optional step. Subzero cooling promotes the transformation of retained austenite to martensite, thereby increasing surface hardness and reducing the propensity of quenched carburized steels to burn and crack during surface grinding. The chapter includes numerous data plots and tables showing how the various treatments influence hardness, wear resistance, tensile properties, and fatigue and fracture behaviors.
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Conference papers on the topic "Retained austenite transformation"

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Shan, Tikun, Weigang Zhang, Zhongqin Lin, and Shuhui Li. "Prediction of the Volume Fraction of Retained Austenite in Sheet Metal Forming for Trip Steels." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21023.

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The dependence of the transformation rate on the multiaxial stress state corresponding to different loading paths is investigated. To achieve different loading paths, single shear uniaxial tension, plane strain and equi-biaxial stretching tests have been carried out for BTR380 steel. On Based of the experimental results, the influence of the stress state on stability of retained austenite is analyzed and an equation of transformation kinetics is developed to predict stress triaxiality-dependence strain-induced transformation. In sheet metal forming, the material undergoes complicated deformati
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Chentouf, Samir Mourad, Mohammad Jahazi, and Rejean Fortin. "Influence of the Quench Process on Microstructure Evolution in a Landing Gear Steel." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38636.

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The quench process of large size components is always problematic owing to non-uniform phase formation. In this context, the influence of cooling rate on phase transformation, for different cooling rates, in 300M steel is studied. A combination of high resolution dilatometry, optical microscopy, Vickers micro hardness measurements were employed to accurately determine the critical transformation temperature, and to identify microstructure constituents (bainite, martensite, and retained austenite). A mixture of bainite, martensite and some retained austenite phases were observed to appear at co
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Voothaluru, Rohit, Vikram Bedekar, and Praveen Pauskar. "A New Micromechanical Model to Study Transformation Plasticity in High-Carbon Steels." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-3043.

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Abstract Hardened steels in engineering applications tend to have gradient microstructures with varying amounts of retained austenite alongside harder phases such as martensite or bainite. However, the metastable austenite can transform into martensite under mechanical loads, resulting in an inelastic strain within the material from the volumetric mismatch between FCC austenite and BCT martensite. In this work, a new constitutive formulation based upon the critical driving force for austenite transformation is presented. The model was implemented into a crystal plasticity formulation, and empi
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Vilela Costa, Larissa, Vincent Lelong, Dennis Beauchesne, Robert L. Cryderman, and Kip O. Findley. "Fatigue Performance of Low Pressure Carbonitrided 20MnCr5 and SAE 8620 Steel Alloys." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0187.

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Abstract Low pressure carbonitriding and pressurized gas quenching heat treatments were conducted on four steel alloys. Bending fatigue tests were performed, and the highest endurance limit was attained by 20MnCr5+B, followed by 20MnCr5, SAE 8620+Nb, and SAE 8620. The differences in fatigue endurance limit occurred despite similar case depths and surface hardness between alloys. Low magnitude tensile residual stresses were measured near the surface in all conditions. Additionally, nonmartensitic transformation products (NMTPs) were observed to various extents near the surface. However, there w
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Reichert, Jennifer M., Matthias Militzer, Warren J. Poole, and Laurie Collins. "A New Approach Using EBSD to Quantitatively Distinguish Complex Transformation Products Along the HAZ in X80 Linepipe Steel." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33668.

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State-of-the-art linepipe steels are microalloyed low-carbon steels that combine high strength and fracture toughness with good weldability. During welding of pipe sections the heat affected zone (HAZ) experiences rapid thermal cycles resulting in a graded microstructure that can be significantly different from that of the base metal. In particular a variety of bainitic microstructures can form in the HAZ. Depending on the type of bainite mechanical properties may be improved or may lead to poor fracture resistance and be detrimental to the overall HAZ performance. Optical microscopy is not su
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Wilson, Brent M., Matthew G. Dick, and Scott H. Magner. "Predicting Railway Tapered Roller Bearing Life Using Measured Residual Stress and Retained Austenite Data." In IEEE/ASME/ASCE 2008 Joint Rail Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/jrc2008-63043.

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A predictive life tool for case-carburized railcar tapered roller bearings, called the Service Load Factor (SLF), makes use of residual stress and retained austenite data to assess the condition of bearings as a result of service history. It is well known that the interaction between retained austenite transformation and the development of residual stresses are primary factors contributing to cone bore growth and decreased resistance to raceway spalling. This paper attempts to quantify these changes throughout the life of a bearing to provide insight into the predicted remaining service life o
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Reichert, Jennifer M., Thomas Garcin, Matthias Militzer, and Warren J. Poole. "Formation of Martensite/Austenite (M/A) in X80 Linepipe Steel." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90465.

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Linepipe steels are usually microalloyed with Nb to promote the formation of complex microstructures that lead to the required mechanical properties. In particular, Nb in solution affects significantly the austenite decomposition kinetics and the resulting microstructure. A systematic study has been carried out to quantify the influence of Nb on the austenite decomposition kinetics in X80 linepipe steel. Continuous cooling transformation tests were conducted with a Gleeble 3500. The transformation products include ferrite, granular and upper bainite and M/A (martensite/ retained austenite) con
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Meyer, Jason, Stefan Habean, Dan Londrico, and Justin Sims. "Relationship Between Deep Case Carburizing and Residual Stress in Rolling Contact Service." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0321.

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Abstract The proposition that compressive residual stresses are beneficial in improving the service life of components subject to rolling contact fatigue is well documented. However, the exact nature of the relationship between effective case depth (ECD) and the residual stress state is not well understood for components with deep case depth (>0.050inches, 1.27mm). It is expected that compressive residual stresses will gradually transition to tensile stresses as the case depth increases beyond a threshold value. In addition, the strain-induced transformation of retained austenite and it
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Polishetty, Ashwin, and Guy Littlefair. "Recent Advances in Machining of Austempered Ductile Iron to Avoid Machining Induced Microstructural Phase Transformation Reaction." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3903.

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Austempered Ductile Iron (ADI) is a type of nodular, ductile cast iron subjected to heat treatments — austenitising and austempering. Whilst machining is conducted prior to heat treatment and offers no significant difficulty, machining post heat treatment is demanding and often avoided. Phase transformation of retained austenite to martensite leading to poor machinability characteristics is a common problem experienced during machining. Study of phase transformations is an investigative study on the factors — plastic strain (εp) and thermal energy (Q) which effect phase transformations during
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Meyer, Jason, Stefan Habean, Dan Londrico, and Justin Sims. "Modeling the Effect of Chemistry Changes on Phase Transformation Timing, Hardness, and Distortion in Carburized 8620 Gear Steel." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0309.

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Abstract AISI 8620 low carbon steel is widely used due to its relatively low cost and excellent case hardening properties. The nominal chemistry of AISI 8620 can have a large range, affecting the phase transformation timing and final hardness of a carburized case. Different vendors and different heats of steel can have different chemistries under the same AISI 8620 range which will change the result of a well-established heat treatment process. Modeling the effects of alloy element variation can save countless hours and scrap costs while providing assurance that mechanical requirements are met
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