Mo含量对9Cr18Mo钢组织及耐蚀性的影响  

Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel

作　　者：周健[1,2] 骈利平[2] 方峰 迟宏宵[2] 马党参[2] Zhou Jian;Pian Liping;Fang Feng;Chi Hongxiao;Ma Dangshen(School of Materials Science and Engineering,Southeast University,Nanjing Jiangsu 211189,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2023年第12期244-249,共6页Heat Treatment of Metals

基　　金：河北省重大科技成果转化专项(22281003Z)。

摘　　要：采用显微组织分析、电化学试验以及中性盐雾试验等方法研究了4种不同Mo含量的9Cr18Mo钢显微组织及耐蚀性,探讨了Mo对耐蚀性的影响机理。结果表明,不同Mo含量的9Cr18Mo钢都具有大量的富铬碳化物,碳化物尺寸、数量及硬度随着Mo含量增加而增加;当Mo含量小于0.5%时,腐蚀电位随着Mo含量增加而升高,但当Mo质量达到0.7%时,腐蚀电位下降;经120 h中性盐雾试验,0.5Mo试验钢腐蚀速率较低。含0.7%Mo试样耐点蚀性能的下降与富铬碳化物的形成及碳化物与基体界面附近贫铬区的形成有关。Microstructure and corrosion resistance of the 9Cr18Mo steel with four different Mo contents were studied by microstructure analysis, electrochemical test and neutral salt spray test, then the influence mechanism of Mo on the corrosion resistance was discussed. The results show that the 9Cr18Mo steel with different Mo contents has a large number of chromium-rich carbides, and the size, quantity and hardness of carbides increase with the increase of Mo content. When the Mo content is less than 0.5%, the corrosion potential increases with the increase of Mo content, but decreases when the Mo content reaches 0.7%. After 120 h neutral salt spray test, the corrosion rate of 0.5Mo tested steel is low. The decrease of pitting corrosion resistance of the specimen containing 0.7% Mo is related to the formation of chromium-rich carbides and the formation of chromium-poor zone near the interface between the carbide and matrix.

关 键 词：9Cr18Mo钢 Mo含量 腐蚀电位 点蚀 耐蚀性能 

分 类 号：TG124.24[金属学及工艺—金属学]