采用金相显微镜、万能拉伸试验机、冲击试验机和恒电位仪分析测试手段,研究了Si含量对Cr25Ni5Mo2Cu3RE双相不锈钢的显微组织、力学性能及腐蚀性能的影响规律。结果表明,Si的加入,使奥氏体相随着Si含量的增加而减少,强度随着Si的增加先增大后减小,但是塑性和韧性下降,腐蚀性能下降。当Si含量在0.55%时,Cr25Ni5Mo2Cu3RE双相不锈钢综合性能最好。 The effects of Si content on the microstructure, mechanical properties and corrosion resistance of Cr25Ni5Mo2Cu3RE duplex stainless steel were studied by metallographic microscope, universal tensile tester, impact tester and potentiostat. The results show that with the addition of Si, the austenite phase decreases with the increase of Si content. The strength increases with the increase of Si first and then decreases, but the plasticity and toughness decrease and the corrosion performance decreases. When the Si content of 0.55%, Cr25Ni5Mo2Cu3RE duplex stainless steel best overall performance.