WC初始状态对激光熔覆Ni60/WC涂层组织及性能的影响  

Effect of initial state of WC on microstructure and properties of laser cladding Ni60/WC coatings

作　　者：樊帅奇 张蕾涛 李海涛 王雪松 戴姣燕[2] 徐金富 FAN Shuai-qi;ZHANG Lei-tao;LI Hai-tao;WANG Xue-song;DAI Jiao-yan;XU Jin-fu(School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China;School of Materials Science and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061 [2]宁波工程学院材料与化学工程学院,浙江宁波315211

出　　处：《材料热处理学报》2021年第6期157-162,共6页Transactions of Materials and Heat Treatment

基　　金：宁波市2025重大专项(2019B10084)。

摘　　要：分别以Ni60+30 mass%WC粉末和Ni60+30 mass%Ni包WC粉末为原料,采用激光熔覆技术在45钢表面制备了Ni60/WC涂层,研究了WC初始状态对激光熔覆Ni60/WC涂层组织及性能的影响。结果表明:涂层表面质量均良好,无明显裂纹及气孔等缺陷;观察涂层截面组织发现形貌发现,涂层均能与基体形成良好的冶金结合,但Ni60+30 mass%WC涂层内部存在少量孔洞和微裂纹,WC粒子较大,而Ni60+30 mass%Ni包WC涂层组织均匀且致密,内部无气孔和裂纹,WC粒子分布相对均匀;Ni60+30 mass%WC涂层和Ni60+30 mass%Ni包WC涂层的物相主要由γ-(Fe, Ni)、M_(23)C_(6)、M_(7)C_(3)和WC等组成;Ni60+30 mass%WC与Ni60+30 mass%Ni包WC涂层的平均硬度分别为53 HRC和57 HRC,平均摩擦系数分别为0.54012和0.53631,磨损量分别为0.00172 g和0.00132 g。Ni60/WC coatings were prepared on the surface of 45 steel by laser cladding technology using Ni60+30 mass%WC powder and Ni60+30 mass%Ni-coated WC powder as raw materials,and the effect of initial state of WC on microstructure and properties of the Ni60/WC coating was studied.The results show that the surface quality of the coatings is good,and there are no obvious cracks and pores.By observing the cross-section morphology of the coating,it is found that the coatings can form a good metallurgical bond with the substrate.However,there are a small number of holes and micro-cracks inside the Ni60+30 mass%WC coating,and the WC particle sizes are large,while the microstructure of the Ni60+30 mass%Ni-coated WC coating is uniform and dense,there are no pores and cracks inside the coating,and the distribution of WC particles is relatively uniform.The phases of the Ni60+30 mass%WC coating and Ni60+30 mass%Ni-coated WC coating are mainly composed ofγ-(Fe,Ni),M23C6,M7C3 and WC.The average hardness of the Ni60+30 mass%WC coating and Ni60+30 mass%Ni-coated WC coating is 53 HRC and 57 HRC,respectively,the average friction coefficient is 0.54012 and 0.53631,respectively,and the wear mass loss is 0.00172 g and 0.00132 g,respectively.

关 键 词：激光熔覆 NI60 WC 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]