Transformation-induced plasticity via γ → ε → α′ and γ → ε → γ martensitic transformations in Fe-15Mn-10Cr-8Ni-4Si alloy

被引：17

作者：

Yoshinaka, Fumiyoshi ^{[1
]}

Sawaguchi, Takahiro ^{[1
]}

Takamori, Susumu ^{[1
]}

Emura, Satoshi ^{[1
]}

机构：

[1] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 833卷

基金：

日本学术振兴会;

关键词：

High-Mn steels; Martensitic transformation; Tensile test; Electron backscattering diffraction; Fractography; INTERSECTION REACTIONS; TENSILE PROPERTIES; TRIP/TWIP STEELS; DEFORMATION; STRENGTH; SI; MICROSTRUCTURE; TEMPERATURE; DEPENDENCE; STRESS;

D O I：

10.1016/j.msea.2021.142583

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) are key mechanisms for achieving excellent strength-ductility in advanced high-strength steels (AHSSs). The Fe-15Mn-10Cr-8Ni-4Si alloy is an austenitic steel that exhibits high plastic fatigue durability due to reversible bidirectional gamma ->epsilon ->gamma martensitic transformation under push-pull cyclic loadings. In addition to the fatigue property, the Fe-15Mn-10Cr-8Ni-4Si alloy exhibits good strength-ductility balance (where the product of strength and ductility is 51.4 GPa%). In particular, its total elongation of 77% is comparable to those of TWIP steels. To elucidate the underlying mechanism for the TRIP-enhanced ductility, this study reports on the tensile deformation microstructure. The post-fracture microstructure is a gamma-epsilon-alpha' triple-phase structure that includes a significant amount of deformation-induced epsilon-martensite, whereas the frequency of gamma-twinning was very limited. In addition to sluggish strain-induced epsilon-martensitic transformation (epsilon-TRIP), two-stage gamma ->epsilon ->alpha' martensitic trans-formation (two-stage TRIP) and bidirectional gamma ->epsilon ->gamma transformation (B-TRIP) under monotonic tensile loading were uniquely observed at intersections of the epsilon-martensite variants. The tensile property and microstructure of the Fe-15Mn-10Cr-8Ni-4Si alloy (where the Gibbs free energy difference Delta G(gamma ->epsilon) between gamma-austenite and epsilon-martensite is-65.0 J/mol) are compared with those of the Fe-30Mn-(6-x)Si-xAl (x = 0, 1, 2, 3, 4, 5, 6 wt%) alloy system, with different Delta G(gamma ->epsilon) (-276.5-417.5 J/mol) resulting in different plastic deformation mechanisms (martensitic transformations or twinning). The three TRIP mechanisms with different transformation paths, i.e., gamma ->epsilon, epsilon ->alpha', and the reverse epsilon ->gamma, in the Fe-15Mn-10Cr-8Ni-4Si alloy are then discussed in terms of their contributions to its excellent ductility, which is comparable to that produced by TWIP.

引用

页数：12

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