钨含量对新型高铬锰氮双相不锈钢Cr29Mn12Ni2N0.6Wx组织和性能的影响

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。

Effect of Tungsten Content on Microstructure and Properties of New Type High Chromium,Manganese and Nitrogen Duplex Stainless Steels Cr29Mn12Ni2N0.6Wx

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.