Moderating martensitic transformation rate enables simultaneous enhancements of ductility and strength

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-20 DOI:10.1016/j.msea.2025.149164

Yindong Shi , Xinrui Yang , Lina Wang , Shuai Ren , Xiliang Zhang , Jiarui Guo , Zhenguo Xing , Yuntian Zhu

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引用次数: 0

Abstract

The rate of martensitic transformation plays a pivotal role in determining mechanical properties of TRIP materials. However, optimizing this rate to simultaneously achieve high strength and ductility in single-phase materials remains challenging. Here we report a moderate martensitic transformation rate can enable a maximum uniform elongation and improved yield strength in a gradient-dislocation structured 321 stainless steel, significantly outperforming its coarse-grained counterpart. The gradient dislocation structure was produced by cyclic twisting processing, which introduced dislocation entanglements and Lomer-Cottrell (L-C) locks. During the tensile testing, dislocation slip, stacking faults, nanotwinning and martensitic transformation were activated. This synergistic interplay effectively moderated the martensitic transformation kinetics. Notably, the sustained emission of Shockley partials from L-C locks and γ/α′ interfaces facilitated persistent nanotwinning at comparatively low stress levels, contributing to continuous work hardening. This study presents a promising strategy for regulating the martensitic transformation kinetics to enhance the mechanical properties of TRIP materials.

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减缓马氏体相变速率可以同时提高塑性和强度

马氏体相变速率是决定TRIP材料力学性能的关键因素。然而，优化这一速率以同时实现单相材料的高强度和延展性仍然具有挑战性。在这里，我们报告了中等马氏体相变速率可以使梯度位错组织321不锈钢获得最大的均匀伸长率和提高的屈服强度，显著优于粗晶不锈钢。通过循环扭扭加工产生了梯度位错结构，引入了位错纠缠和lmer - cottrell锁。拉伸过程中，激活了位错滑移、层错、纳米孪晶和马氏体相变。这种协同作用有效地减缓了马氏体相变动力学。值得注意的是，在相对较低的应力水平下，L-C锁和γ/α′界面持续发射的肖克利部分促进了持续的纳米孪晶，有助于持续的加工硬化。本研究提出了一种调控马氏体相变动力学以提高TRIP材料力学性能的有前途的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.