液压支架立柱激光熔覆不锈钢的组织与性能

Microstructure and Properties of Laser Cladding Stainless Steel on Hydraulic Support Cylinder

为解决液压支架立柱在服役过程中的腐蚀和磨损问题,使用Fe55粉末在27SiMn钢表面制备激光熔覆层;通过光学显微镜、SEM、XRD等方式研究熔覆层的显微组织及物相组成;通过显微硬度测试、摩擦磨损实验、电化学腐蚀实验、盐雾腐蚀实验验证激光熔覆层的耐磨性和耐腐蚀性。结果表明:熔覆层由88.5%的马氏体和11.5%的残余奥氏体组成;熔覆层最大硬度达710 HV,相同环境下磨损量为基体的1/16;经1008 h盐雾腐蚀实验后无锈蚀,耐腐蚀性能达到国家标准9级水平,满足液压支架立柱的使用要求。

In order to solve the problems of corrosion and wear of hydraulic support cylinder in service,the laser cladding layer was prepared on the surface of 27 SiMn steel with Fe55 powder.The microstructure and phase composition of the cladding layer was studied by optical microscope,SEM and XRD.The wear resistance and corrosion resistance of laser cladding layer were verified by microhardness test,friction-wear test,electrochemical corrosion test and salt spray corrosion test.The results show that the cladding layer is composed of 88.5%martensite and 11.5%residual austenite;the maximum hardness of the layer is 710 HV,and the wear rate of the cladding layer is 1/16 of the substrate under the same condition;after1008 h salt spray corrosion test,the corrosion resistance of the cladding layer reaches the 9 th level of the national standard,which can meet the service requirements of the hydraulic support cylinder.