Cu、W和Mo对Cr25Mn11Ni0·5N0·4双相不锈钢的组织和性能的影响

Effect of Cu,W and Mo on microstructure and properties of Cr25Mn11Ni0.5N0.4 diphase stainless steel

研究了合金元素Cu、W、Mo对Cr25Mn11N i0.5N0.4低N i双相不锈钢的显微组织、力学性能及腐蚀性能的影响。结果表明,Cu在该系列双相不锈钢中为较强的奥氏体形成元素,Mo显著提高铁素体的含量,且促进σ相析出;此系列双相不锈钢经热锻和1000℃固溶处理30 m in后抗拉强度均在810 MPa左右,断面收缩率在60%~70%之间,断裂伸长率均大于40%;0.9Cu、0.9W、0.9Mo合金元素的加入对力学性能影响较小,但均能改善其耐点蚀性能,使其点蚀电位值分别达到78、203和406 mV。

Influence of Cu,W and Mo on microstructure,mechanical and corrosion properties of a new kind of low nickel Cr25Mn11Ni0.5N0.4 diphase stainless steels（DSSs） was investigated.The results show that Cu can stabilize the austenite intensely in the series DSSs,the addition of Mo can increase the ferrite volume fraction and promote the precipitation of σ intermetallic phase.The tensile strength,percentage of area reduction and elongation ratio of the specimens solution-treated at 1000 ℃ for 30 min are about 810 MPa,between 60% and 70%,and above 40%,respectively.There is no obvious effect on mechanical properties by adding Cu,W and Mo,nevertheless,pitting corrosion resistance can be moderately improved,and the pitting potential reach to 78 mV,203 mV and 406 mV,respectively.