热处理工艺调控激光熔覆WC@Ni/Ni60涂层组织与性能  

Heat-treatment process control for microstructure and properties of laser cladding WC@Ni/Ni60 coating

作　　者：梅明亮[1] 黄旭 刘畅 MEI Mingliang;HUANG Xu;LIU Chang(College of Intelligent Manufacturing,Fujian Polytechnic of Information Technology,Fuzhou 350003,China;School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建信息职业技术学院智能制造学院,福建福州350003 [2]福建工程学院机械与汽车工程学院,福建福州350118

出　　处：《粉末冶金工业》2023年第3期111-119,共9页Powder Metallurgy Industry

基　　金：福建省中青年教师教育科研项目(科技类)(JAT201092)。

摘　　要：热处理工艺对改善激光熔覆涂层成形质量具有重要的意义。实验采用WC@Ni/Ni60A与稀土混合粉末,研究不同热处理加工工艺对熔覆层的显微硬度、微观组织、物相组成和残余应力的影响规律,探索出最佳退火温度。结果表明:热处理温度的升高有助于细化晶粒组织;随着热处理温度的升高涂层显微硬度下降,700℃时,涂层显微硬度较高,1%La_(2)O_(3)样件和0.5%Y_(2)O_(3)样件硬度分别为64.9HRC和65.3HRC;随着热处理温度升高,涂层磨损体积发生显著变化,在700℃达到最佳,700℃退火温度,样件摩擦因数均低于未处理样件;热处理温度的升高,有助于降低残余应力。综合考虑各项性能指标,最优热处理方案为:加热温度700℃,升温速度10℃/min,保温时间为60 min,冷却方式为随炉冷却。研究结果为热处理改善涂层质量提供理论依据。The heat treatment process is important to improve the forming quality of laser cladding coatings.In this paper WC@Ni/Ni60A and rare earth mixed powder were used to investigate the influence of different heat treatment processes on the microhardness,microstructure,phase composition,and residual stress of the cladding layer and to explore the optimal annealing temperature.The results show that increasing heat treatment temperature decreases the coating microhardness.Higher microhardness of the coating can be obtained at 700℃.Samples with 1%La_(2)O_(3)and with 0.5%Y_(2)O_(3)have a hardness of 64.9HRC and 65.3HRC,respectively.With the increase of heat treatment temperature,the wear volume becomes larger.At an annealing temperature of 700℃,the friction coefficient of the sample is lower than that of the untreated one.The increase in heat treatment temperature helps to reduce the residual stress.Considering the performance indexes,the optimal heat treatment scheme includes the following parameters:the heating temperature is 700℃,the heating speed is 10℃/min,the insulation time is 60 min,and cooling mode is furnace cooling.The results provide a theoretical basis for improving coating quality through heattreatment.

关 键 词：激光熔覆 WC@Ni/Ni60涂层 稀土 热处理 工艺调控 

分 类 号：TG178[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学] TG156