激光熔覆制备楔块高硬度层的工艺方法研究  

Research on Process Method of Wedge High Hardness Layer Prepared by Laser Cladding

作　　者：朱洪军[1] 胡肇炜[2] 

机构地区：[1]浙江工业职业技术学院机械工程学院,浙江绍兴321000 [2]上海海事大学商船学院轮机工程系,上海201306

出　　处：《热加工工艺》2016年第10期154-156,共3页Hot Working Technology

基　　金：浙江省教育厅科研项目(Y201329825);绍兴市公益性技术应用研究项目(2014B70017)

摘　　要：为获得表面高硬度层及冶金结合,分别以铸铁和普通碳钢为基体,以含WC的镍基合金粉末为熔覆材料,采用激光熔覆技术制备了大面积的熔覆层。测试了熔覆层、结合处以及基体的硬度,并采用扫描电镜、能谱仪对熔覆层进行了微观组织分析。结果表明,以铸铁为基体不易制得良好的熔覆层,而以45钢为基体时,在激光功率1200～2000W之间,扫描速度在2 mm/s左右时能获得质量良好的熔覆层。熔覆层表面硬度高达1100 HV以上,熔覆层与基体呈冶金结合,熔覆层无微观裂纹,微观组织分布均匀,磨削平整后熔覆层厚度可达1 mm以上。For obtaining higher hardness layer and metallurgical bonding with matrix, taking casting iron and carbon steel as matrix, and taking Ni based alloy with WC as cladding powder, the cladding layers were manufactured by laser cladding. The hardness of cladding layer, bonding layer and matrix was tested. The microstructure of cladding layer was studied by scanning electronic microscope and energy dispersive spectrometer. The results show that it is hard to manufacture good quality layer when using cast iron. But when using 45 steel as matrix, laser power of 1200-2000 W, scanning speed of 2 mm/s, the good quality layer can be obtained. The surface hardness of layer is above 1100 HV.The layer and matrix are metallurgical bonding. No micro-crack appears in layer. The distribution of microstructure is uniform, and the thickness of the layer is over 1mm after grinding.

关 键 词：激光技术 熔覆 安全钳楔块 高硬度 工艺方法 

分 类 号：TG113.25[金属学及工艺—物理冶金]