研究了钨含量对新型高铬锰氮双相不锈钢Cr29Mn12Ni2N0.6Wx(x=1,2,3)显微组织、力学性能和耐腐蚀性能的影响。结果表明: Cr29Mn12Ni2N0.6Wx不锈钢固溶处理后具有典型的铁素体+奥氏体双相组织, 铁素体含量在45%~60%范围内; 随着钨含量的增加, 合金中σ相的析出倾向增强, 铁素体含量增加, 合金的耐腐蚀性能降低, 屈服强度和抗拉强度升高; 经1 050 ℃固溶处理30 min后, 该系列双相不锈钢中不再有σ相析出, 其屈服强度大于650 MPa, 抗拉强度大于900 MPa, 断后伸长率大于30％, 作为高强度资源节约型超级双相不锈钢具有潜在应用前景。

Influence of tungsten content on the microstructure, mechanical properties and corrosion resistance of a new type high chromium, manganese and nitrogen duplex stainless steels with a composition of Fe-29Cr-12Mn-2Ni-0.6N-xW (x=1,2,3) was investigated. The results show that Fe-29Cr-12Mn-2Ni-0.6N-xW steels after solution treating had typical dual-phase microstructure of ferrite and austenite, and the ferrite content was in the range of 45%-60%. With the increase of tungsten content, precipitation tendency of σ phase and ferrite content in the alloy enhanced, corrosion resistance of the alloy reduced, and yield strength and ultimate tensile strength increased. When Fe-29Cr-12Mn-2Ni-0.6N-xW steels were solution treated at 1 050 ℃ for 30 min, there was no σ phase precipitation in the microstructure, yield strength, ultimate tensile strength and percentage elongation were beyond 650 MPa, 900 MPa and 30% respectively. So these type alloy has a bright future in application as high strength resource-saving super duplex stainless steels.