激光熔覆原位生成VC增强Fe-Ni基复合涂层的组织与硬度  

Microstructure and hardness of in-situ synthesized VC-reinforced Fe-Ni-based composite coating by laser cladding

作　　者：张伟[1,2] 冯秋红 王尔亦[3] 郑炉玉 张伟中[1] Zhang Wei;Feng Qiuhong;Wang Eryi;Zheng Luyu;Zhang Weizhong(Zhejiang Institute of Mechanical and Electrical Engineering,Hangzhou Zhejiang 310053,China;Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou Zhejiang 310014,China;Zhejiang Machinery and Electrical Group,Hangzhou Zhejiang 310002,China)

机构地区：[1]浙江机电职业技术学院,浙江杭州310053 [2]浙江工业大学激光先进制造研究院,浙江杭州310014 [3]浙江省机电集团有限公司,浙江杭州310002

出　　处：《金属热处理》2019年第7期190-193,共4页Heat Treatment of Metals

基　　金：浙江省公益技术应用研究项目(2017C31057,GG19E050018)

摘　　要：针对高速电梯制动瓦块材料耐高温磨损性差的问题,以V粉和Ni基合金粉末为原料,进行了激光熔覆原位生成VC增强Fe-Ni基复合涂层的试验,分析了不同粉末质量配比、不同工艺参数下熔覆层的组织演变规律和硬度性能。研究表明:通过原位反应可获得主要由VC、Cr3C2、Fe3C和Ni-Fe固溶体组成的陶瓷复合涂层;VC的含量随V含量的增加而增加;在较低的扫描速度下,VC颗粒呈梅花状或菊花状弥散分布。当扫描速度较高时,VC呈胞状和块状,主要分布在晶界上;V含量10%、30%、50%对应的熔覆层平均硬度分别为562、715、908 HV0.2。Aiming at the problem of poor high-temperature wear-resistance of brake block used in ultra-high speed elevator,the experiments of laser cladding for VC-Cr3C2-Fe3C/Fe-Ni composite coating was prepared by using V powder and Ni-based alloy powder as cladding materials.The microstructure evolution and hardness properties of the cladding layer under different powder mass ratios and different process parameters were analyzed.The results show that the obtained ceramic composite coating is mainly composed of VC,Cr3C2,Fe3C and Ni-Fe solid solution,and the content of VC increases with the increase of V content.At low scanning speeds,VC particles are distributed in plum blossom-like or chrysanthemum-like,but when the scanning speed is high,VC is mainly distributed on the grain boundary in cellular-like or block shape.When the V content is 10%,30%and 50%,the average hardness of the coating are 562 HV0.2,715 HV0.2 and 908 HV0.2,respectively.

关 键 词：复合材料 激光熔覆 显微组织 硬度 碳化钒 

分 类 号：TG156.99[金属学及工艺—热处理] TG174.44[金属学及工艺—金属学]