期刊论文详细信息
Micro & nano letters
Analysis of mechanical behaviour of single-phase austenitic stainless steels based on microstructure deformation mechanism
article
Ya Shi1  Jianqiu Zhou1 
[1] School of Mechanical and Power Engineering, Nanjing Tech University;Key Lab of Design and Manufacture of Extreme Pressure Equipment;School of Mechatronics Engineering, Guizhou Minzu University
关键词: 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;   
DOI  :  10.1049/mnl.2018.5641
学科分类:计算机科学(综合)
来源: Wiley
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【 摘 要 】

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.

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