热处理对GCr15轴承钢火焰喷涂+感应重熔复合熔涂层组织与性能的影响  

Effect of heat treatment on microstructure and properties of coatings on GCr15 bearing steel prepared by flame spraying+induction remelting technology

作　　者：张玺 张浩然 解芳[1] 闫基森 武冰冰 孔凡校 Zhang Xi;Zhang Haoran;Xie Fang;Yan Jisen;Wu Bingbing;Kong Fanxiao(School of Intelligent Manufacturing,Nanyang Institute of Technology,Nanyang Henan 473000,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China)

机构地区：[1]南阳理工学院智能制造学院,河南南阳473000 [2]重庆大学材料科学与工程学院,重庆400030

出　　处：《金属热处理》2023年第8期242-247,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(51605230);河南省重点研发与推广专项(科技攻关)(222102240002,232102221022);南阳理工学院交叉科学研究项目(520064)。

摘　　要：以镍铬硼硅合金粉末(HG-201)为喷涂材料,采用火焰喷涂+感应重熔之复合熔涂技术,在GCr15轴承钢表面制备熔涂层并对其进行不同热处理。采用SEM、OM、显微硬度测试及冲击试验研究了不同热处理工艺对熔涂层的微观组织、界面形貌、显微硬度、冲击性能及冲击断口形貌的影响。结果表明,复合熔涂处理可细化GCr15钢的晶粒,提高其显微硬度和冲击性能,平均冲击吸收能量比常规淬火GCr15钢提高335.85%;经等温淬火、等温淬火+回火处理后,复合熔涂GCr15钢组织内的残留奥氏体和内应力进一步消除,但显微硬度和冲击性能稍有下降,熔涂层冲击断口均表现为准解理断口的小晶面断裂方式。Using Ni-Cr borosilicon powder(HG-201)as coating material,coatings on surface of GCr15 bearing steel were prepared by flame spraying+induction remelting composite melt coating technology,and then heat treated by different processes.Effects of different heat treatments on the microstructure,interface morphology,microhardness,impact property and impact fracture morphology of the coatings were studied by means of SEM,OM,microhardness test and impact test.The results show that the composite melt coating can refine the grain and improve the microhardness and impact property of GCr15 steel.The average impact absorbed energy of composite melt coated GCr15 steel is improved by 335.85%compared with that of conventional quenched GCr15 steel.After austempering or austempering+tempering treatment,the retained austenite and internal stress in the composite melt coated GCr15 steel are further eliminated,but the microhardness and impact property are slightly decreased,and the impact fracture of coatings shows the fracture mode of facet quasi-cleavage.

关 键 词：GCR15轴承钢 HG-201喷涂材料 复合熔涂 等温淬火 冲击性能 显微硬度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]