铬含量对粉末冶金铁素体不锈钢力学性能和耐蚀性的影响  

Effect of Chromium Contents on Mechanical Properties and Corrosion Resistance of Powder Metallurgical Ferritic Stainless Steels

作　　者：刘子麒 郭丽雅 王荣胜 陈迪 偶琛 王辰瑜 戴瑞桢 张博涵 彭景光 LIU Ziqi;GUO Liya;WANG Rongsheng;CHEN Di;OU Chen;WANG Chenyu;DAI Ruizhen;ZHANG Bohan;PENG Jingguang(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;BN-HOFO Material Technology(Anhui)Co.,Ltd.,Bengbu Anhui 233010,China;Mechanics Institute,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]安徽昊方机电股份有限公司,安徽蚌埠233010 [3]上海电机学院机械工程学院,上海201306

出　　处：《上海金属》2025年第2期15-22,共8页Shanghai Metals

基　　金：国家自然科学基金(50734008)。

摘　　要：通过以600、700和800 MPa的压力压制预合金粉末,随后在1380℃氢气氛中烧结2 h制备了含17%~26%(质量分数)Cr的粉末冶金铁素体不锈钢。检测了钢的力学性能和耐蚀性。结果表明:粉末冶金铁素体不锈钢的孔隙率随压制压力的增大而降低,表面硬度随压制压力和Cr含量的增加而提高;钢的屈服强度和抗拉强度随Cr含量的增加而提高,但Cr含量过高导致富Cr第二相析出,断后伸长率降低;Cr含量的增加导致钢的腐蚀电位向正极偏移和腐蚀电流密度减小。Powder metallurgical ferritic stainless steels containing 17%to 26%Cr by mass were fabricated by pressing prealloyed powder at pressures of 600,700,and 800 MPa followed by sintering in hydrogen atmosphere at 1380℃for 2 h.The steels were tested for mechanical properties and corrosion resistance.The results showed that(a)the porosity of the powder metallurgical ferritic stainless steels decreased with the increase in pressing pressure,and their surface hardness increased with the increase in both pressing pressure and chromium content;(b)the yield and tensile strengths of the steel increased with the increase in chromium content,but excessive chromium content caused the precipitation of chromium-rich second phases with the result that the steel decreased in elongation;and(c)the increase in chromium content led to the shift of corrosion potential of the steels to the positive electrode and the decrease in their corrosion current density.

关 键 词：铁素体不锈钢 粉末冶金 微观组织 力学性能 耐蚀性 

分 类 号：TG306[金属学及工艺—金属压力加工]