高温热处理对激光熔覆合金层组织与性能的影响  

Effect of Heat Treatment on the Microstructure and Properties of Laser Cladding Alloy

作　　者：熊炜[1] 张庆茂[1] 夏琪[2,3] 郭亮[1] 

机构地区：[1]华南师范大学广东省微纳光子功能材料与器件重点实验室,广东广州510006 [2]上海市激光技术研究所,上海200233 [3]上海市激光束精细加工重点实验室,上海200233

出　　处：《应用激光》2013年第3期233-238,共6页Applied Laser

基　　金：中央财政支持地方高校专项资金项目激光先进制造创新培养基地资助项目(项目编号:510-C10293);广东省教育厅学科建设专项资助项目(项目编号:CXZD1139);华南理工大学国家金属材料近净成形工程技术研究中心开放基金资助项目(项目编号:2011006);上海市科学技术委员会科技攻关项目(项目编号:11DZ1110700)

摘　　要：为了研究激光熔覆合金层组织性能在高温热处理条件下的变化规律,利用YLS-4000连续光纤激光器,采用同步送粉法在Q235钢表面激光熔覆了Ni60、Ni60+25%WC两种合金粉末。然后利用SXL-1030型程控箱式电炉对熔覆了两种粉末涂层的Q235钢进行高温热处理,600℃保温10 h。采用光学显微镜、SEM、XRD等研究了涂层的组织和变化,利用显微硬度计测试了涂层的显微硬度分布,高温摩擦磨损仪测试了涂层的耐磨性。研究结果结果表明:Ni60合金层金相组织为较致密的针状晶和树枝晶,经过高温热处理后,晶粒长大为较大颗粒状,而且合金层显微硬度和耐磨性只有小幅下降,表现出良好的抗高温耐磨性;而Ni60+25%WC合金层金相组织包含了WC晶粒,高温热处理后,WC晶粒分布均匀化,显微硬度和耐磨性得到一定的提高。In order to study the variation of the microstructure and properties of laser cladding alloy layer under the conditions of high temperature heat treatment .Laser cladding of Ni60 and Ni60＋25%WC alloy coating on Q235 steel was achieved by using a continuous fiber lasers named YLS-4000. And made heat treatment on the two cladding samples by 600 ℃ and 10 h insulation by SXL-1030 programmable box furnace. The microstructure and properties of cladding samples was carried out by means of metallographic, SEM, XRD, high-temperature friction and wear equipment and micro-hardness equipment. The results show that Ni60 alloy layer microstructure dense needle-like crystals and dendrites. After high-temperature heat treatment, the crystal grains grow larger granular and the micro-hardness and wear resistance of Ni60 alloy layer slightly decline which exhibits good resistance to high temperature wear resistance; Ni60 ＋25%WC alloy layer has WC grains.. After high-temperature heat treatment, the WC grains distribute more uniformly which leads to the wear resistance and micro-hardness of Ni60＋25%WC alloy layer improve.

关 键 词：激光熔覆 热处理 合金层组织 

分 类 号：TG156.9[金属学及工艺—热处理]