W6Mo5Cr4V2高速钢表面的激光熔覆研究  

Study on Laser Cladding on Surface of W6Mo5Cr4V2 High Speed Steel

作　　者：陈翔 张德强[2] 李金华[2] 王一臣 张吉庆 CHEN Xiang;ZHANG Deqiang;LI Jinhua;WANG Yichen;ZHANG Jiqing(Engineering Training Center,Liaoning University of Technology,Jinzhoul21001,China;Faculty of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhoul21001,China;Wonder Auto Group Limited,Jinzhou 121000,China;Shandong steel rizhao fine steel base,Rizhao 276800,China)

机构地区：[1]辽宁工业大学工程训练中心,辽宁锦州121001 [2]辽宁工业大学机械工程与自动化学院,辽宁锦州121001 [3]万得汽车集团有限公司,辽宁锦州121000 [4]山东钢铁日照精品钢基地,山东日照276800

出　　处：《热加工工艺》2019年第22期101-104,115,共5页Hot Working Technology

基　　金：辽宁省自然科学基金优秀人才培育项目(2015020170);辽宁教育厅项目(L2015231)

摘　　要：通过正交实验和多项式回归分析方法,在W6Mo5Cr4V2高速钢表面激光熔覆了WC/Co陶瓷粉末,借助金相显微镜.HVS-1000显微硬度计分析了熔覆参数对熔覆层显微硬度、组织的影响。结果表明,熔覆层组织与性能受到激光功率、送粉电压、扫描速度的影响,综合应用多项式回归分析和正交实验,可得到送粉电压、激光功率与平均显微硬度的回归方程,该方程可较准确的反映三者的关系。在激光功率为1.1 kW、送粉电压为14V、扫描速度为3mm/s时,其平均显微硬度1311 HV,最高硬度点出现在距离熔覆层顶点0.4 mm处。熔覆层中富有W2C硬质相,起到了弥散强化的作用。By designing orthogonal experiment and polynomial regression analysis method, WC/Co ceramic powderswere cladded on W6Mo5Cr4V2 high speed steel surface. The influences of laser cladding process parameters on the surfacemicrohardness and microstructure of the cladding layer were studied by metallographic microscope, HVS・1000 microhardnessmeter, respectively. The results show that the microstructure and performance of the cladding layer are influenced by laserpower, powder feeding rate and scanning speed. Combining polynomial regression analysis and orthogonal experiment, theregression equation of powder feeding rate, laser power and average microhardness can be obtained. This equation can be usedto accurately reflect the relationship between these three factors. When the laser power is 1.1 kW, the powder feeding rate is14 V and the scanning speed is 3 mm - s'1, the average microhardness of the cladding layer is 1311HV, and the maximumhardness point appears at the position that 0.4 mm from the top of the cladding layer. The cladding layer is rich in W2C hardphase, which plays the effect of dispersion strengthening.

关 键 词：激光熔覆 显微硬度 回归方程 陶瓷粉末 高速钢 

分 类 号：TG[金属学及工艺]