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This is a Quantitative Study study (also classified as: Experimental Study).

October 9, 2025

Microstructure Characterisation and Fe-Simulation of Strain Induced Phase Transformations in Low Alloyed Steels

GRG. ReisnerMontanuniversität Leoben FFF.D. FischerUniversity of Stuttgart EWEwald WernerMontanuniversität Leoben

Key Points

The findings indicate that carbon concentration significantly affects austenite stability against martensite formation.
During deformation, low alloyed steels exhibit phase transformations that enhance the material's plastification process.
A thermodynamical model incorporating Gibbs free energy effectively simulates strain induced transformations in these steels.
Understanding the microstructure's role is crucial for optimizing performance in applications involving these low alloyed steels.

Abstract

Abstract Low alloyed TRIP-steels with noticeable amounts of carbon stabilised retained austenite can be obtained from commercial dual-phase steels. During the deformation of TRIP-steels the austenite undergoes a strain induced martensitic phase transformation, which enhances the plastification of the material. The microstructure of TRIP-steels consists of a baimtic-ferritic matrix with small spherical austenitic inclusions. Using a thermodynamical approach based on the Gibbs free energy and an appropriate micromechanical unit cell model, the strain induced transformation can be modeled conveniently. It is shown, that the carbon concentration of the austenite is of great importance to its stability against the martensite formation. The role of the transformation strain tensor is elucidated.

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