Reverse phase transformation of martensite to austenite in stainless steels: a 3D phase-field study

Yeddu, Hemantha Kumar; Lookman, Turab; Saxena, Avadh

doi:10.1007/s10853-014-8067-9

Cited by 28 publications

(20 citation statements)

References 62 publications

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“…Since the lath boundaries are the areas where a small driving force is sufficient to overcome the transformation barriers, reversion occurs primarily at the lath boundaries. These results are in good agreement with our study on reversion of martensite to austenite in stainless steels [28].…”

Section: Microstructure Evolution During Pressure Releasesupporting

confidence: 93%

“…In the case of steels, where martensitic transformation and reversion are associated with significant amount of plastic deformation of the material, we observed that a large amount of plastic strains are retained after the reverse phase transformation [28]. The amount of plastic deformation in Zr is not as large as that in steels.…”

Section: Microstructure Evolution During Pressure Releasementioning

confidence: 64%

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Alpha – omega and omega – alpha phase transformations in zirconium under hydrostatic pressure: A 3D mesoscale study

2016

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a b s t r a c tA three dimensional (3D) elastoplastic phase-field model is developed for modeling the hydrostatic pressure-induced alpha e omega phase transformation and the reverse phase transformation, i.e. omega e alpha, in zirconium (Zr). Plastic deformation and strain hardening of the material are also considered in the model. The microstructure evolution during both phase transformations is studied. The transformation start pressures at different temperatures are predicted and are plotted as a phase diagram. The effect of phase transformations on the mechanical properties of the material is also studied. The input data corresponding to pure Zr are acquired from experimental studies as well as by using the CALPHAD method. Our simulations show that three different omega variants form as laths. On release of pressure, reverse phase transformation initiates at lath boundaries. We observe that both phase transformations are martensitic in nature and also occur at the same pressure, i.e. little hysteresis. The transformation start pressures and the kinetics of the transformation predicted by our model are in good agreement with experimental results.

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Section: Microstructure Evolution During Pressure Releasesupporting

confidence: 93%

Section: Microstructure Evolution During Pressure Releasementioning

confidence: 64%

Alpha – omega and omega – alpha phase transformations in zirconium under hydrostatic pressure: A 3D mesoscale study

2016

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“…Reliable thermodynamic databases are essential tools in the design of AHSS. [58][59][60][61][62][63][64] They need to cover a number of alloying (Mn, Al, Cr, Ni, Si, C, N, B) and tramp elements (Zn, Cu, H, P, S), doped on purpose or entering through ores and scraps. Each of these elements contributes differently to the stability of the iron-rich solutions (liquid, ferrite, austenite (c), and epsilon (e)) and the second-phase precipitates.…”

Section: A Key Thermodynamic Concepts For Advanced High-strength Stementioning

confidence: 99%

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

Raabe

Sun

Silva

et al. 2020

Metall Mater Trans A

134

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This is a viewpoint paper on recent progress in the understanding of the microstructure–property relations of advanced high-strength steels (AHSS). These alloys constitute a class of high-strength, formable steels that are designed mainly as sheet products for the transportation sector. AHSS have often very complex and hierarchical microstructures consisting of ferrite, austenite, bainite, or martensite matrix or of duplex or even multiphase mixtures of these constituents, sometimes enriched with precipitates. This complexity makes it challenging to establish reliable and mechanism-based microstructure–property relationships. A number of excellent studies already exist about the different types of AHSS (such as dual-phase steels, complex phase steels, transformation-induced plasticity steels, twinning-induced plasticity steels, bainitic steels, quenching and partitioning steels, press hardening steels, etc.) and several overviews appeared in which their engineering features related to mechanical properties and forming were discussed. This article reviews recent progress in the understanding of microstructures and alloy design in this field, placing particular attention on the deformation and strain hardening mechanisms of Mn-containing steels that utilize complex dislocation substructures, nanoscale precipitation patterns, deformation-driven transformation, and twinning effects. Recent developments on microalloyed nanoprecipitation hardened and press hardening steels are also reviewed. Besides providing a critical discussion of their microstructures and properties, vital features such as their resistance to hydrogen embrittlement and damage formation are also evaluated. We also present latest progress in advanced characterization and modeling techniques applied to AHSS. Finally, emerging topics such as machine learning, through-process simulation, and additive manufacturing of AHSS are discussed. The aim of this viewpoint is to identify similarities in the deformation and damage mechanisms among these various types of advanced steels and to use these observations for their further development and maturation.

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“…But the strain hardening effect becomes complex and is temperature-related: at low temperature (<600 • C), the strain hardening effect is not significant; but at the temperature of 900 • C, the flow stress increases linearly with the plastic strain, and the strain hardening effect becomes significant. This phenomenon is considered to be related with the phase transition, when the temperature reaches and exceeds the critical phase transition temperature, some tempered martensite grains in the metal gradually transforms into austenite grains [19,20], resulting in the decrease of strength but the increase of plasticity.…”

Section: Plastic Constitutive Model Fittingmentioning

confidence: 99%

On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

Xie

Gao

et al. 2019

Metals

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For the implementation of simulations for large plastic deformation processes such as cutting and impact, the development of the constitutive models for describing accurately the dynamic plasticity and damage behaviors of materials plays a crucial role in the improvement of simulation accuracy. This paper focuses on the dynamic behaviors of 45CrNiMoVA ultra-high-strength torsion bar steel. According to investigation of the Split-Hopkinson pressure bar (SHPB) and Split-Hopkinson tensile bar (SHTB) tests at different strain rate and different temperatures, 45CrNiMoVA ultra-high-strength steel is characterized by strain hardening, strain-rate hardening and thermal softening effects. Based on the analysis on the mechanism of the experimental results and the limitation of classic Johnson-Cook (J-C) constitutive model, a modified J-C model by considering the phase transition at high temperature is established. The multi-objective optimization fitting method was used for fitting model parameters. Compared with the classic J-C constitutive model, the fitting accuracy of the modified J-C model significantly improved. In addition, finite element simulations for SHPB and SHTB based on the modified J-C model are conducted. The SHPB stress-strain curves and the fracture morphology of SHTB samples from simulations are in good agreement with those from tests.

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Reverse phase transformation of martensite to austenite in stainless steels: a 3D phase-field study

Cited by 28 publications

References 62 publications

Alpha – omega and omega – alpha phase transformations in zirconium under hydrostatic pressure: A 3D mesoscale study

Alpha – omega and omega – alpha phase transformations in zirconium under hydrostatic pressure: A 3D mesoscale study

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

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