Journal ArticleDOI
Stability of retained austenite in TRIP-assisted steels
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TLDR
In this article, a theory for the quantitative representation of the strain induced transformation of retained austenite in low alloy, TRIP-assisted steels of the type developed for the automobile industry is developed.Abstract:
A theory is developed for the quantitative representation of the strain induced transformation of retained austenite in low alloy, TRIP-assisted steels of the type developed for the automobile industry. It is possible, therefore, to calculate the fraction of austenite as a function of the plastic strain, chemical composition, deformation temperature and the starting amount of austenite. The effect of composition and temperature is expressed through the free energy available for transformation. Good agreement has been obtained with published experimental data. The model can be used to investigate the stability of the austenite during plastic deformation.read more
Citations
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Steels for bearings
TL;DR: In this paper, the structure and properties of bearing steels prior to the point of service are first assessed and described in the context of steelmaking, manufacturing and engineering requirements, followed by a thorough critique of the damage mechanisms that operate during service and in accelerated tests.
Journal ArticleDOI
Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite
TL;DR: In this paper, it was suggested that the austenite volume fraction and its mechanical stability is the key to understand the phase transformation induced deformation behavior of manganese-bearing steels.
Journal ArticleDOI
The Role of Retained Austenite on Tensile Properties of Steels with Bainitic Microstructures
TL;DR: In this article, two main aspects of the retained austenite, morphology and chemical composition, have been studied to determine the role that these play on the ductility behavior of the bainitic steels studied.
Journal ArticleDOI
An in situ high-energy X-ray diffraction study of micromechanical behavior of multiple phases in advanced high-strength steels
N. Jia,Zhenhua Cong,Xin Sun,Sheng Cheng,Zhihua Nie,Yang Ren,Peter K. Liaw,Yandong Wang,Yandong Wang +8 more
TL;DR: In this paper, the elastic and plastic properties of high-strength steels with multiple phases were characterized using the in situ high-energy X-ray diffraction technique, where the authors provided a fundamental understanding of the stress partitioning of soft and hard phases, and the different workhardening rates of the multiphase steels.
Journal ArticleDOI
Strain partitioning and mechanical stability of retained austenite
Joo Hyun Ryu,Dong-Ik Kim,Hyoung Seop Kim,H. K. D. H. Bhadeshia,H. K. D. H. Bhadeshia,Dong-Woo Suh +5 more
TL;DR: In this paper, the authors demonstrate that the partitioning of strain between phases with different mechanical properties can dramatically influence the stability of austenite in steels, which is usually attributed to its chemical composition, size and shape.
References
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Journal ArticleDOI
Kinetics of strain-induced martensitic nucleation
Gregory B. Olson,Morris Cohen +1 more
TL;DR: In this paper, an expression for the volume fraction of martensite vs plastic strain is derived by considering the course of shear-band formation, the probability of shears-band intersections, and probability of an intersection generating a martensitic embryo.
Book
Bainite in Steels
TL;DR: The mechanism of the bainite transformation in steels is reviewed in this paper, with a summary of the early research and concluding with an assessment of the transformation in the context of the other reactions which occur as austenite is cooled to temperatures where it is no longer the stable phase.
Journal ArticleDOI
A mechanism for the strain-induced nucleation of martensitic transformations*
Gregory B. Olson,Morris Cohen +1 more
TL;DR: In this article, the authors distinguish between strain-induced nucleation and stress-assisted nucleation, the latter involving the same sites and embryos as does the regular spontaneous transformation, while the former depends on the creation of new sites by plastic deformation; this phenomenon may also contribute in a major way to autocatalytic nucleation during the course of martensitic transformation.
Journal ArticleDOI
Enhancement of Elongation by Retained Austenite in Intercritical Annealed 0.4C-1.5Si-O.8Mn Steel
TL;DR: In this paper, an excellent combination of elongation over 30% and high strength about 100kgf/mm2 is achieved in processing of a 0.4C-1.8Mn steel by intercritical annealing, rapid cooling into bainite transformation temperature to soak several minutes.
Journal ArticleDOI
Deformation-induced martensitic transformation and transformation-induced plasticity in steels
TL;DR: In this article, the authors make clear two types of role of applied stress and plastic strain on the martensitic transformation, and they suggest that the deformation-induced martinsitic transformation can be understood only in terms of the effect of applied stresses rather than the effect on strain.