Effects of Silicon on the Microstructure and Mechanical Properties of 15–15Ti Stainless Steel
来源期刊：Acta Metallurgica Sinica2020年第11期
论文作者：Hao-Yu Yi Tian Liang Min Wang Xiang-Dong Zha Ying-Che Ma Kui Liu
文章页码：1583 - 1590
摘 要：Effects of silicon on the microstructure and mechanical properties of 20% cold-worked 15–15 Ti austenitic stainless steels are systemically investigated by uniaxial tensile tests, scanning and transmission electron microscope observations, and strength calculations. The results reveal that a large number of deformation twins are formed in the 20% cold-worked steels with various silicon additions. The volume fraction of deformation twins and the density of dislocations increase with silicon content,while the twin thickness slightly decreases. A better strength–ductility combination is achieved by silicon addition, since the yield strength of the steel with 2% silicon is 61 MPa higher than that of the steel with 1% silicon, while their uniform elongations are almost both equal to 16%. The yield strength of the 15–15 Ti stainless steels is predominantly contributed by the solid solution, dislocation and deformation twin strengthening effects, which can be enhanced by silicon addition.
Hao-Yu Yi1，Tian Liang2，Min Wang2，Xiang-Dong Zha2，Ying-Che Ma2，Kui Liu2
1. China Nuclear Power Technology Research Institute2. Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research , Chinese Academy of Sciences
摘 要：Effects of silicon on the microstructure and mechanical properties of 20% cold-worked 15–15 Ti austenitic stainless steels are systemically investigated by uniaxial tensile tests, scanning and transmission electron microscope observations, and strength calculations. The results reveal that a large number of deformation twins are formed in the 20% cold-worked steels with various silicon additions. The volume fraction of deformation twins and the density of dislocations increase with silicon content,while the twin thickness slightly decreases. A better strength–ductility combination is achieved by silicon addition, since the yield strength of the steel with 2% silicon is 61 MPa higher than that of the steel with 1% silicon, while their uniform elongations are almost both equal to 16%. The yield strength of the 15–15 Ti stainless steels is predominantly contributed by the solid solution, dislocation and deformation twin strengthening effects, which can be enhanced by silicon addition.
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