Analysis of mechanical behaviour of single‐phase austenitic stainless steels based on microstructure deformation mechanism. (14th August 2019)

• Record Type: Journal Article
• Authors: Shi, Ya; Zhou, Jianqiu
• Is Part Of: Micro & nano letters. Volume 14:Number 9(2019)
• Page Start: 1024
• Page End: 1028
• Publication Date: 2019-08-14
• Subjects: twinning -- plastic flow -- austenitic stainless steel -- ductility -- grain size -- stress‐strain relations -- fracture toughness; mechanical behaviour -- single‐phase austenitic stainless steel -- microstructure deformation mechanism -- deformation twins -- duplex microstructure -- nonrecrystallised grains -- nanotwinned austenitic structures -- statically recrystallised matrix -- uniaxial tension -- bimodal grain size distribution -- toughness -- twin spacing -- twin volume fraction -- stress‐strain curves -- ductility -- flow stress -- fracture toughness; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2018.5641
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : The single‐phase austenitic stainless steel has attracted widespread attention from scientists because of its special composition. This steel with single‐phase but duplex microstructure consists of coarse non‐recrystallised grains with nanotwinned austenitic ( nt‐γ ) structures and soft statically recrystallised matrix. Additionally, during uniaxial tension, microstructure deformation – deformation twins will occur. Owing to its bimodal grain size distribution and the effect of nt‐γ structures, this steel can make a balance between strength and toughness. To analyse the mechanical behaviour of single‐phase austenitic stainless steels, the authors proposed a theoretical model based on their physical deformation mechanism. It was found that the flow stress of single‐phase austenitic stainless steels will be affected by five factors – the twin spacing, the volume fraction of twins, grain sizes of coarse‐grained phase and matrix phase and the ratio of volume fractions of the two phases.