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 deformationdeformation 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 factorsthe 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.
Single-phase austenitic stainless steels (316L) have attracted widespread attention from scientists because of their duplex microstructure. In this paper, to have a quantitative understanding on the microstructure deformation of 316L, a physical model based on dislocation theory and strain gradient theory is established to find out the critical conditions when deformation twins generate. The twinning stress and the stress caused by strain gradients are two factors affecting the deformation twinning process. Numerical simulation results reveal that the twinning stress decreases with the increase of twin spacing and the decreases of volume fraction of twins and the orientation of external shear stress; the stress caused by strain gradients increases with the decrease of matrix grain size.
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