Heterostructure alleviates L?ders deformation of ultrafine-grained stainless steels

作者：Sun, Guosheng; Liu, Jizi^*; Zhu, Yuntian^*

来源：Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing , 2022, 848: 143393.

DOI：10.1016/j.msea.2022.143393

• Stainless steel
• Heterostructure
• L?ders band
• Strain delocalization
• HDI hardening

Ultrafine-grained (UFG) 304 stainless steel is much stronger than its coarse-grained counterpart. However, it develops undesired Luders bands during deformation. Here we report a bi-modal heterostructure that can effectively suppress Luders 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.

• 单位
  test; TEST; 南京理工大学