钼对金属型铸造高铬铸铁组织与性能的影响  

Effect of molybdenum on microstructure and mechanical properties of permanent-mould high chromium cast iron

作　　者：夏鹏举[1] 邹祥宇[1] 寇小平[1] 

机构地区：[1]陕西理工学院材料科学与工程学院,陕西汉中723000

出　　处：《陕西理工学院学报（自然科学版）》2016年第1期19-24,共6页Journal of Shananxi University of Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51201094);陕西理工学院专项科研基金资助项目(SLGQD13-22)

摘　　要：分别用光学显微镜、扫描电镜、X-ray衍射仪和微机控制电液伺服万能试验机等研究了钼含量的变化对高铬铸铁中碳化物的形态和分布以及力学性能的影响。结果表明:适量的钼可以细化组织和改变碳化物形貌及分布,碳化物由长条状转变为球状,对基体的割裂程度减小明显。在高铬铸铁中加入合金元素钼可在不牺牲其韧性的情况下有效地提高其硬度及耐磨性,其中一部分钼固溶于奥氏体中提高了高铬铸铁淬透性,一部分与碳形成新的化合物Mo2C,从而提高了高铬铸铁的耐磨性。当钼的总加入量为0.9%时,高铬铸铁的综合力学性能达到最佳。Influence of different molybdenum content in high chromium cast iron properties was studied. The carbide morphology,size and mechanical properties of high chromium cast iron were analysed by means of optical microscope,scanning electron microscope,X-ray diffraction and microcomputer controlled electro-hydraulic servo universal testing machine. The results showed that a measured amount of molybdenum can obviously refine the microstructure of high chromium cast iron,the lath-shaped morphology of carbide transformed to spherical shaped,disseverance of matrix was obviously diminished. One part of molybdenum was solved in austenite and the others formed Mo2 C. Hardenability,hardness and wear resistance of high chromium cast iron were effectively improved,as well as keep the same toughness with the matrix. The mechanical properties of high chromium cast iron were optimal when content of molybdenum was 0. 9%.

关 键 词：高铬铸铁 钼 显微组织 力学性能 

分 类 号：TG143.9[一般工业技术—材料科学与工程] TG249.4[金属学及工艺—金属材料]