Effects of silicon on the microstructure and mechanical properties of 20% cold-worked 15–15Ti 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 15–15Ti stainless steels is predominantly contributed by the solid solution, dislocation and deformation twin strengthening effects, which can be enhanced by silicon addition.

通过单轴拉伸试验，扫描和透射电子显微镜观察以及强度计算，系统地研究了硅对20％冷加工的15-15Ti奥氏体不锈钢的显微组织和力学性能的影响。结果表明，在添加了各种硅的20％冷加工钢中形成了大量的变形孪晶。变形孪晶的体积分数和位错密度随硅含量的增加而增加，而孪晶的厚度则略有减小。通过添加硅可以实现更好的强度-延展性组合，因为硅含量为2％的钢的屈服强度比硅含量为1％的钢的屈服强度高61 MPa，而它们的均匀伸长率几乎都等于16％。