Exploring hot deformation mechanism and precipitation behavior of Fe–5.6Mn–0.18C–1.1Al(–0.1Ti–0.22Mo) steels through physical modeling and microstructure characterization

Exploring hot deformation mechanism and precipitation behavior of Fe–5.6Mn–0.18C–1.1Al(–0.1Ti–0.22Mo) steels through physical modeling and microstructure characterization

This study investigated the hot deformation mechanism and precipitation behavior of Fe–5.6Mn–0.18C-1.1Al(–0.1Ti–0.22Mo) steels through hot compression tests conducted at temperatures ranging from 750 °C to 1150 °C and strain rates from 0.01 s−1 to 1 s−1. The flow stress behavior was analyzed using a...

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Bibliographic Details
Main Authors: H.T. Zhang, H.Y. Li, N. Xiao, S.H. Sun, H.L. Yan, M.H. Cai, Y.–K. Lee
Format: Article
Language:English
Published: Elsevier 2025-05-01
Series:Journal of Materials Research and Technology
Subjects:
Medium Mn steel
Ti–Mo microalloying
Hot deformation
Deformation–induced ferrite transformation
Dynamic recrystallization
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785425012992
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Summary:This study investigated the hot deformation mechanism and precipitation behavior of Fe–5.6Mn–0.18C-1.1Al(–0.1Ti–0.22Mo) steels through hot compression tests conducted at temperatures ranging from 750 °C to 1150 °C and strain rates from 0.01 s−1 to 1 s−1. The flow stress behavior was analyzed using an Arrhenius–type constitutive equation, revealing that Ti–Mo microalloying increased the activation energy for hot deformation by 101.9 kJ/mol. Furthermore, the hot deformation behavior was modeled and predicted using the Bergström model for the work hardening/recovery stage and the Kolmogorov–Johnson–Mehl–Avrami (KJMA) model for dynamic recrystallization (DRX). Microstructural analysis of specimens deformed at 750 °C indicated that deformation–induced ferrite transformation (DIFT) facilitated softening in the intercritical region, with the Kurdjumov–Sachs (K–S) orientation relationship between the deformation–induced ferrite and the parent austenite. At 850 °C, nano–sized (Ti,Mo)C precipitates refined prior austenite grains and suppressed DRX due to a strong pinning effect. However, at 1050 °C and above, precipitate coarsening weakened the pinning effect, resulting in similar flow behavior and microstructural features in both steels.
ISSN:2238-7854

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