A Thermodynamic-Based Model to Predict the Fraction of Martensite in Steels

Huyan, Fei; Hedström, Peter; Höglund, Lars; Borgenstam, Annika

doi:10.1007/s11661-016-3604-6

Cited by 17 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The (modified) K-M equations discussed above are empirical. Huyan et al [223] developed a thermodynamic model based on the Magee model [218] to predict the martensite fraction, by further taking the martensitic autocatalysis nucleation and austenite stabilization into account. The former one is attributed to the increased nucleation sites provided by the previous martensite while the latter one is attributed to the enhanced deformation energy in the untransformed austenite, i.e.…”

Section: Temperature Dependent Martensite Formationmentioning

confidence: 99%

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Dai

Chen

Ding

et al. 2021

Materials Science and Engineering: R: Reports

145

View full text Add to dashboard Cite

Over many decades, significant efforts have been made to improve the strength-elongation product of advanced high strength steels (AHSSs) by creating tailored multi-phase microstructures. Successive solid-state phase transformations for steels with a well selected chemical composition turned out to be the key instrument in the realisation of such microstructures. In this contribution, we first provide a brief review of the desired microstructures for Transformation-induced plasticity (TRIP), Carbide-free Bainitic (CFB), Quenching & Partitioning (Q&P) and Medium Manganese steels followed by comprehensive discussions on the phase transformations to be used in their creation. The implications for the steel composition to be selected are addressed too. As the presence of the right amount and type of metastable retained austenite (RA) is of crucial importance for the mechanical performance of these AHSSs, special attention is paid to the important role of successive solid-state phase transformations in creating the desired fraction and composition of RA by suitable element partitioning (in particular C and Mn). This critical partitioning not only takes place during final cooling (austenite decomposition) but also during the back transformation (austenite reversion) during reheating.This review aims to be more than just descriptive of the various findings, but to present them from a coherent thermodynamic / thermo-kinetic perspective, such that it provides the academic and industrial community with a rather complete conceptual and theoretical framework to accelerate the further development of this important class of steels. The detailed stepwise treatment makes the review relevant not only for experts but also metallurgists entering the field.

show abstract

Section: Temperature Dependent Martensite Formationmentioning

confidence: 99%

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Dai

Chen

Ding

et al. 2021

Materials Science and Engineering: R: Reports

145

View full text Add to dashboard Cite

show abstract

“…This V1-V16 pairing is typical for high carbon plate martensite [15] and therefore indicates that the early-formed large martensite units have a stronger plate martensite crystallographic character compared to the later-formed units. The plate character of martensite is expected from Ms calculation in Thermo-Calc [50][51][52][53] for the used composition, where Ms is 198.4 C for plate and 187.3 C for lath martensite. The later-formed martensite has the typical character shown in the mixed region between lath and plate martensite.…”

Section: Discussionmentioning

confidence: 99%

Early Martensitic Transformation in a 0.74C–1.15Mn–1.08Cr High Carbon Steel

Kohne

Maimaitiyili²,

Winkelmann

et al. 2022

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

The martensitic transformation in a high carbon steel was studied by a new experimental approach focusing on the nucleation and growth as well as the variant pairing of the early-formed martensite. A mixed microstructure with tempered early-formed martensite and fresh later-formed martensite was achieved by a heat treatment with an isothermal hold below the martensite start temperature. In-situ high-energy X-ray diffraction showed no further transformation of austenite to ferrite/martensite during the isothermal hold. The tempered early-formed martensite was characterized with a combination of light optical microscopy and local tetragonality determination by electron backscatter diffraction. The characterization allowed qualitative as well as quantitative analysis of the tempered early-formed martensite with regard to the prior austenite grain boundaries (PAGB) and variant pairing. The early-formed martensite was shown to grow predominantly along the PAGBs and clustering was observed indicating an autocatalytic nucleation mechanism. The variant pairing of the early-formed martensite had a stronger plate character compared to the later-formed martensite.

show abstract

“…It would be interesting to validate T KM by measuring the M s temperature using instruments of different sensitivities in conditions where the austenite grain size has a negligible effect. Huyan et al [77] proposed a thermodynamic model to calculate athermal martensite fraction:…”

Section: Kinetic Models Of Athermal Transformationmentioning

confidence: 99%

Modelling the stability and transformation kinetics of retained austenite in steels

Wong

2022

Materials Science and Technology

View full text Add to dashboard Cite

The stability of retained austenite refers to its resistance to transform into martensite. While most models describe the thermal and mechanical influence on retained austenite stability and transformation kinetics separately, few have considered explaining both aspects in a unified model. Here, we review the factors governing austenite stability and transformation kinetics, together with models which predict these properties. By assessing the predictive capabilities of models using experimental data, several parameters have been identified as crucial in describing transformation behaviour. We anticipate that this review will stimulate further research in developing physics-based models that could improve the understanding of austenite stability and transformation.

show abstract

A Thermodynamic-Based Model to Predict the Fraction of Martensite in Steels

Cited by 17 publications

References 19 publications

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Early Martensitic Transformation in a 0.74C–1.15Mn–1.08Cr High Carbon Steel

Modelling the stability and transformation kinetics of retained austenite in steels

Contact Info

Product

Resources

About