GDL-1钢等离子表面合金化组织与耐磨性  

Microstructure and wear resistance of plasma surface alloying layer of GDL-1 steel

作　　者：程晨[1] 雷旻[1,2] 代利[1] 万明攀[1,2] 曾玉金 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州大学贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《材料热处理学报》2018年第1期123-128,136,共7页Transactions of Materials and Heat Treatment

摘　　要：采用高能等离子束在GDL-1钢基体表面预涂覆302合金粉末进行合金化表面改性。分析合金化层的成分、组织结构、硬度和耐磨性。结果表明：单道扫描合金化层以铁基固溶体为基体,均匀分布Fe3C、Cr7C3、W2C、WC、VC、MoC和Mo2C等细小弥散碳化物;由表及里组织分别为细密的等轴晶与树枝晶混合组织,沿散热方向的树枝晶,胞状晶,从熔池表层到中心,树枝晶组织越来越粗化;多道搭接合金化层组织为粗大的树枝晶。合金化层的硬度在700~850 HV0.1之间,GDL-1钢耐磨性得到明显改善。Surface modification of 302 alloy powders on GDL-1 steel substrate by high energy plasma beam was carried out. The composition, microstructure, hardness and wear resistance of the alloying layer were analyzed. The results show that the single channel scanning alloying layer is based on Fe based solid solution and uniformly distributes fine dispersed carbides such as Fe3 C, Gr7 C3 , W2 C, WC, VC, MoC and Mo2C. The microstructure from the exterior to the interior is mixed microstructure combined fine equiaxed crystal and dendrites, the dendrites and cell crystals along the radiating direction are observed. The microstructure of the dendrites from the surface of the molten pool to the center becomes coarser gradually, and the microstructure of the multi-channel overlapping alloying layer is composed of coarse dendrites. The hardness of the alloying layer is 700-850 HV0.1, and the wear resistance of the GDL-1 steel is improved obviously.

关 键 词：合金化 耐磨性 302涂层 电子背散射衍射 

分 类 号：TG174.44[金属学及工艺—金属表面处理]