Effect of chemical composition on microstructure and deformation behavior of 316L austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.05.013

Abstract

Abstract: Room temperature uniaxial tensile test was carried out by universal testing machine for hot-rolled 316L stainless steel plate with different nickel equivalents, then microstructure of the steel before and after the tensile deformation was observed by scanning electron microscope (SEM) and transmission electron microscope(TEM), and the effect of nickel equivalent(Nieq) on microstructure and properties of 316L stainless steel was explored. The results show that the microstructure at solid solution state is austenite and a small amocmt of high temperature δ phase, the strength decreases with the increase of Nieq, and the plasticity and toughness increase with the increase of Nieq. The tensile fracture is characterized by ductile fracture, and with the increase of Nieq, the number of dimples decreases while the size of dimples increases. The TEM observation shows that no martensitic transformation occurs in the deformed tested steel, when the Nieq is low, the dislocation density in the place with large deformation is high, dislocation interaction occurs, and deformation twins are formed locally. With the increase of Nieq, the density of deformation twin increases, and resulting in crossing and hysteresis.

Key words: 316L austenitic stainless steel, tensile properties, fracture morphology, microstructure, deformation twins

CLC Number:

TG142.1

Mo Jinqiang, Feng Guanghong, Xu Mei, Zhang Wei, Li Yang. Effect of chemical composition on microstructure and deformation behavior of 316L austenitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(5): 81-86.

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