激光熔覆原位自生碳化钨陶瓷涂层的研究  

Study on In-situ Synthesis WC Ceramic Coating by Laser Cladding

作　　者：李楠[1] 张吉庆[2] LI Nan ZHANG Jiqing(Liaoning Jianzhou Vocational College, Liaoyang 111000,China Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China)

机构地区：[1]辽宁建筑职业学院,辽宁辽阳111000 [2]辽宁工业大学机械工程与自动化学院,辽宁锦州121001

出　　处：《热加工工艺》2017年第2期127-129,133,共4页Hot Working Technology

基　　金：辽宁省自然科学基金优秀人才培养项目(2015020170)

摘　　要：使用IPG光纤激光器YLR-3000激光加工系统,在45钢表面通过激光熔覆自熔性碳化钨陶瓷涂层,提高熔覆层组织和性能。对涂层的硬度和显微组织进行分析。结果表明:激光功率1200 W、扫描速度2 mm/s、送粉电压7 V时,熔覆层的平均洛氏硬度约是基体平均硬度的2.6倍;熔覆层及界面处无裂纹、气孔等缺陷,熔覆层中上部的晶粒细小,沿熔覆层与基体交界处向外晶粒呈现柱状晶及等轴晶,组织性能良好,基体与熔覆层间冶金结合牢固。Using IPG fiber laser YLR-3000 laser processing system, self-fluxing WC ceramic coating was prepared on 45 steel surface by laser cladding in order to improve the microstructure and properties of the cladding layer. The hardness and microstructure of the coating were analyzed. The results show that when laser power is 1200 W, scanning speed is 2 mm/s, and powder feeding voltage is 7 V, the average Rockwell hardness of the cladding layer is about 2.6 times of the average hardness of the matrix. The cladding layer and interface has no crack, holes and other defects. The grain on the ridge part of the cladding layer is small. The interface of microstructure of cladding layer and substrate along the junction of outward grain presents columnar crystal and equiaxial crystal, and the rnicrostructure performance is good. The metallurgical bonding between substrate and cladding layer is strong.

关 键 词：激光熔覆 自熔性镍基碳化钨 工艺参数 宏观表面 表面硬度 组织 显微硬度 

分 类 号：TG174.453[金属学及工艺—金属表面处理]