合金元素对中铬铁素体不锈钢组织性能的影响  

Effect of Alloying Elements on Microstructure and Properties of Medium Chromium Ferritic Stainless Steel

作　　者：陈安忠 任娟红[1] 赵雅 CHEN Anzhong;REN Juanhong;ZHAO Ya(Gansu Jiu Steel Group Hongxing Iron and Steel Co.Ltd.,Iron and Steel Research Institute,Jiayuguan 735100,China;Gansu Iron and Steel Vocational and Technical College,Jiayuguan 735100,China)

机构地区：[1]甘肃酒钢集团宏兴钢铁股份有限公司钢铁研究院,甘肃嘉峪关:735100 [2]甘肃钢铁职业技术学院,甘肃嘉峪关735100

出　　处：《甘肃冶金》2024年第2期95-99,共5页Gansu Metallurgy

基　　金：2021年甘肃省高等学校创新基金项目(2021B-476);甘肃省科技计划资助项目(18JR2RB001);高校创新项目基金项目(2019A-242)。

摘　　要：采用金相、电化学试验、点腐蚀以及盐雾试验等手段,对比分析了添加合金元素Cr、Cu和Mo的常规碳氮中铬铁素体不锈钢与超低碳氮中铬超纯铁素体不锈钢组织性能。试验结果表明:中铬铁素体不锈钢中高C、N含量会导致基体析出大量铬碳化物,造成碳化物周围基体贫铬,影响耐点蚀性能;添加0.2%合金元素Cu提高了不锈钢的电极电位,在3.5%NaCl中性溶液中拥有高的自腐蚀电位和低的自腐蚀电流密度;添加合金元素0.2%Cu和Mo的常规碳氮中铬铁素体不锈钢500h中性盐雾腐蚀试验可以达到超低碳氮中铬铁素体不锈钢同样水平。By means of metallographic,electrochemical test,point corrosion test and salt spray test,the microstructure and properties of conventional carbon nitrogen medium chromium ferritic stainless steels with alloying elements Cr,Cu and Mo were compared with those of ultra-low carbon nitrogen medium chromium ultra-pure ferritic stainless steels.The results show that the high content of C and N in the medium chromium ferritic stainless steel will lead to the precipitation of a large a-mount of chromium carbide,resulting in poor chromium in the matrix around the carbide and affecting the pitting resistance.The addition of o.2%Cu increases the electrode potential of stainless steel,and has high self-corrosion potential and low self-corrosion current density in 3.5%NaCl neutral solution.The 500 h neutral salt spray corrosion test of conventional car-bon nitrogen medium chromium ferritic stainless steel with alloying element 0.2%Cu and Mo can reach the same level as that of ultra-low carbon nitrogen medium chromium ferritic stainless steel.

关 键 词：中铬铁素体不锈钢 点腐蚀 盐雾腐蚀 点蚀电位 

分 类 号：TG142.1[一般工业技术—材料科学与工程]