An Ideal Ultrafine-Grained Structure for High Strength and High Ductility

作者：Chongxiang Huang, W. Hu, Qingyuan Wang, Cui Wang, Gang Yang, Yuntian Zhu · 发表于：Materials Research Letters · 年份：2014 · DOI：10.1080/21663831.2014.968680 · 被引用次数：129 · 研究领域：Microstructure and mechanical properties、Metal and Thin Film Mechanics、Microstructure and Mechanical Properties of Steels

An ideal ultrafine-grained (UFG) microstructure for high strength and high ductility should have short dislocation-slip path to impede dislocation slip and very low dislocation density to ensure more room for dislocation accumulation. Such a microstructure is hard to produce, especially for UFG metals produced by severe plastic deformation techniques. Here, we report an ideal UFG structure produced by reverse transformation of deformation-induced martensite in 304 L austenitic stainless steel. It produced small grains and a high density of nanotwins for both high strength and high ductility. This approach is applicable to face-centered cubic metals with low stacking fault energy.