27SiMn钢表面激光熔覆不锈钢涂层显微组织与耐磨性研究  

Study on Microstructure and Wear Resistance of Laser Cladding Wear-stainless Steel Coating on 27SiMn Steel

作　　者：聂翔宇 汤海波[2] 何蓓 刘栋 Nie Xiangyu;Tang Haibo;He Bei;Liu Dong(National Engineering Laboratory of Additive Manufacturing for Large Melallic Components.Beihang University,Beijing 100191,China;Research Institute for Fronier Science,Beihang Universily,Beijing 100191,China)

机构地区：[1]北京航空航天大学大型金属构件增材制造国家工程实验室,北京100191 [2]北京航空航天大学前沿科学技术创新研究院,北京100191

出　　处：《煤矿机械》2022年第8期30-33,共4页Coal Mine Machinery

基　　金：国家重点研发计划(2018YFB2002000);国家科技重大专项(2017-Ⅶ-0003-0096)。

摘　　要：煤矿井下工作环境复杂且恶劣,煤矿液压支柱在服役过程中易磨损失效,为了延长其使用寿命需进行表面强化。在液压立柱常用材料27SiMn钢表面采用激光熔覆制备了马氏体不锈钢涂层,对其显微组织、硬度、耐磨性能进行了表征。结果表明,熔覆层底部为平面晶,下部为垂直熔合线生长的树枝晶和胞晶,中上部为杂乱生长的树枝晶。C、B、Cr元素在枝晶间偏析,形成了M7(B,C)3片层共晶化合物。涂层显微硬度达到560 HV,远高于基材(250 HV),具有优异的耐磨性能,平均摩擦因数较基材(0.802)降低了29.2%,磨痕平均宽度(306μm)是基材磨痕宽度的56.1%,27SiMn钢表面严重的粘着磨损得到大幅改善。The underground working environment of coal mine is complex and bad, and the hydraulic prop of coal mine is easy to wear and fail in the service process. In order to prolong its service life,surface strengthening is required. Martensitic stainless steel coating was prepared by laser cladding on the surface of 27SiMn steel, and its microstructure, hardness and wear resistance were characterized.The results show that the bottom of the cladding layer is plane crystal, the lower part is dendrite and cell crystal growing perpendicular to the fusion line, and the middle and upper part is dendrite growing disorderly. C, B and Cr elements segregate between dendrites to form M7(B,C)3 lamellar eutectic compounds. The microhardness of the coating reaches 560 HV, which is much higher than that of the substrate(250 HV), and has excellent wear resistance. The average friction coefficient is 29.2% lower than that of the substrate(0.802). The average width of wear pit of cladding layer is 56.1% of the wear pit width of the substrate(306 μm). The serious adhesive wear on the surface of 27SiMn steel has been greatly improved.

关 键 词：27SIMN钢 涂层 激光表面熔覆 显微组织 耐磨性 

分 类 号：TG111.5[金属学及工艺—物理冶金]