Heterostructure alleviates Lüders deformation of ultrafine-grained stainless steels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number143393
Journal / PublicationMaterials Science and Engineering A
Volume848
Online published31 May 2022
Publication statusPublished - 19 Jul 2022

Abstract

Ultrafine-grained (UFG) 304 stainless steel is much stronger than its coarse-grained counterpart. However, it develops undesired Lüders bands during deformation. Here we report a bi-modal heterostructure that can effectively suppress Lüders deformation in the UFG 304 stainless steel, which produces a strong strain hardening to improve the ductility and toughness, without sacrificing much strength. These superior mechanical properties are attributed to strain delocalization capability of the bi-modal heterostructure, which results in lower stress concentration and consequently postpones the martensitic transformation.

Research Area(s)

  • HDI hardening, Heterostructure, Lüders band, Stainless steel, Strain delocalization