Effect of strain rate on mechanical properties and microstructural evolution in a ferrite austenite duplex medium Mn steel

IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
J.J. Mao , L. Liu , Z.Y. Liang
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Abstract

Here, we explored the mechanical behavior and microstructural evolution of a ferrite-austenite duplex medium Mn steel under extremely high strain rate (103 s-1). It is found that the yield strength increases by 135 MPa with the increase of strain rate from 10–3 to 103 s-1. Yet, the strain hardening rate decreases significantly, resulting in a lower ultimate tensile strength and a reduced uniform elongation. Microstructural analysis and thermodynamic calculations reveal that dislocation multiplication is promoted by high-strain-rate deformation at the small strain of 4.0 %. At large strains, adiabatic heating causes a substantial temperature increase, reaching 367 K at the engineering strain of 25.9 %. This temperature rise leads to a significant increase in the stacking fault energy of austenite, suppressing transformation-induced plasticity effect. The elevated temperature also enhances dynamic recovery of dislocations, inhibiting dislocation multiplication during high-strain-rate deformation. As a result, the suppressions of both transform-induced plasticity effect and dislocation multiplication result in the decrease of strain hardening rate.

Abstract Image

应变速率对铁素体-奥氏体双相中锰钢力学性能和组织演变的影响
本文研究了铁素体-奥氏体双相中Mn钢在极高应变速率(103 s-1)下的力学行为和显微组织演变。结果表明,当应变速率从10-3增加到103 s-1时,屈服强度增加135 MPa。然而,应变硬化速率显著降低,导致极限抗拉强度降低,均匀伸长率降低。显微组织分析和热力学计算表明,在4.0%的小应变下,高应变率变形促进了位错的增殖。在大应变下,绝热加热导致温度大幅升高,在工程应变为25.9%时达到367 K。这一温度升高导致奥氏体层错能显著增加,抑制了相变诱发的塑性效应。升高的温度还增强了位错的动态恢复,抑制了高应变速率变形过程中位错的增殖。结果表明,相变诱发塑性效应和位错增殖的抑制均导致了应变硬化速率的降低。
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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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