WC增强Fe基合金熔覆层的组织与湿砂磨损特性  

Microstructure and Wet Sand Abrasion Resistance of Fe-based Alloy Clad Coatings Reinforced with WC

作　　者：江少群[1,2] 王刚[1] 陈超文[1] 

机构地区：[1]河海大学力学与材料学院,南京210098 [2]常州市河海科技研究院有限公司,江苏常州213164

出　　处：《中国表面工程》2015年第1期36-41,共6页China Surface Engineering

基　　金：江苏省自然科学基金(BK2011250);江苏省博士后科学基金(1101017C);中国博士后科学基金(20100481079)

摘　　要：采用等离子熔覆方法在Q235钢基体上制备了WC增强Fe基合金熔覆层,研究了添加质量分数为10%~30%WC-Co对熔覆层的微观结构和湿砂磨损特性的影响。结果表明：大部分WC-Co在等离子熔覆过程中发生分解,WC-Co添加量为30%时,熔覆层主要由α-Fe固溶体、Fe6W6C、（Cr,Fe）23C6和WC相组成;熔覆层的显微组织形貌自界面结合处至涂层上部逐渐转变,即由平面晶变为树枝晶再转为胞状晶,α-Fe固溶体主要以树枝晶/胞状晶存在,而Fe6W6C、（Cr,Fe）23C6相则主要在枝晶间析出;熔覆层显微硬度均不小于800HV0.2,其湿砂磨损形式主要为磨粒磨损,且熔覆层显微硬度与抗湿砂磨损能力均随WC-Co添加量增加而增大,这主要与强化相（Fe6W6C、（Cr,Fe）23C6、WC）的含量以及固溶强化效果随WC-Co添加量增多而增大有关。The Fe-based alloy clad coatings reinforced with WC were prepared on Q235 steel by a plasma cladding process, The effects of WC-Co doping content （10%- 30%） on the microstructure and wet sand abrasion resistance of the clad coatings were investigated. Results show that most WC-Co particles are dissolved during the cladding process and the clad coating with 30% WC-Co mainly consists of a-Fe solid solution, Fe6W6C, （Cr, Fe）23C6 and WC phases. The microstructure of the clad coatings gradually transits from planar crystal to dendritic crystal and cellular crystal along the direction from the interface of the substrate-coating to the top of the coating. The a-Fe solid solution presents in the form of dendritic crystal/cellular crystal. The Fe6 W6 C and （Cr, Fe）2a C6 phases mostly precipitate in the intergranular network of the dendrites. The microhardness of the clad coatings is not less than 800 HV0. z. All of the clad coatings display abrasive wear feature. Moreover, the microhardness and wet sand abrasion resistance of the clad coatings are improved with the increase of WC-Co doping content, which can be mainly attributed to the combined action of the enhancement of solution strengthening effect and the increase of reinforcements （Fe6W6C, （Cr, Fe）23C6 , and WC）.

关 键 词：FE基合金 涂层 等离子熔覆 WC 磨损 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG115.58[金属学及工艺—金属学]