等离子喷焊Mo-Fe-Cr-B合金覆层的组织性能研究  

Microstructure and properties of Mo-Fe-Cr-B alloy coating by plasma spraying welding

作　　者：常智敏 潘应君[1] 王盼[1] 柯德庆[1] 黄辽 李子豪 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《武汉科技大学学报》2017年第6期428-431,共4页Journal of Wuhan University of Science and Technology

基　　金：武汉科技大学省部共建耐火材料与冶金国家重点实验室青年基金(2016QN18);武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室开放基金(FMRUlab17-7)

摘　　要：采用等离子喷焊法在Q235钢表面熔敷一层Mo-Fe-Cr-B合金覆层,借助光学显微镜、SEM、EDS、XRD、显微硬度计及电化学工作站等对该覆层的组织结构及性能进行表征分析。结果表明,Mo-Fe-Cr-B合金覆层组织由均匀分布的α-Fe、Mo_2FeB_2、(Mo,Cr,Fe)_3B_2和(Cr,Fe)7C3等相组成;覆层与Q235钢基体形成良好的冶金结合,在熔合线附近存在元素的相互扩散;覆层显微硬度最高可达871HV0.3,其为Q235钢基体硬度的4倍;覆层耐腐蚀性能强于Q235钢及Ni60覆层。The Mo-Fe-Cr-B alloy coatings were prepared on the surface of Q235 steel by plasma spraying welding,then characterized and tested by optical microscope,scanning electron microscope,energy dispersion spectrum,X-ray diffractometer,microhardness tester and electrochemical corrosion work station.The results show that the Mo-Fe-Cr-B alloy coatings consist ofα-Fe,Mo2FeB2,（Mo,Cr,Fe）3B2 and（Cr,Fe）7C3,which are evenly distributed.Favorable metallurgical coalescent has formed between the Mo-Fe-Cr-B alloy coatings and the Q235 steel substrate with elements diffusion at the interface.The Mo-Fe-Cr-B alloy coatings have the maximal microhardness of 871 HV0.3,about four times that of Q235 steel.Corrosion resistance of the Mo-Fe-Cr-B alloy coatings is also better than that of Q235 steel and Ni60 coatings.

关 键 词：等离子喷焊 合金履层 Mo2FeB2 显微组织 显微硬度 极化曲线 电化学腐蚀 

分 类 号：TG118[金属学及工艺—物理冶金]