摘要
采用5kW连续CO_2激光器,在H13热作模具钢表面进行激光熔覆Stellite-6(简称St6)、St6+5%WC、St6+5%WC+1%RE钴基合金复合涂层。采用光学显微镜、扫描电子显微镜、X射线衍射仪、显微硬度计及磨损试验机,对熔覆层的显微组织、元素分布、相组成、显微硬度及磨损性能等进行了系统研究。结果表明,激光熔覆层与基体为冶金结合,各熔覆层的基体相组织为γ-Co、γ-Ni,增强相组织均包括Cr-Ni-Fe-C、(Mn,Cr)_7C_3、Cr_(23)C_6等相,此外,St6+5%WC和St6+5%WC+1%RE熔覆层的增强相中增加了WC、W_2C和SiC相;熔覆层显微硬度HV_(0.2)为560~710HV;摩擦磨损试验结果表明,在相同条件下,耐磨性能由高到低依次是St6+5%WC+1%RE、St6+5%WC、St6、H13钢。
Stellite-6, St6 in short, St6 ＋ 5 % WC, St6 ＋ 5 % WC＋ 1%RE cobalt base self-fluxing powders were employed to enhance the H13 steel surface in CO2 laser cladding process. The microstructure, elements distribution, phase composition etc. of the coatings were investigated using Optical Microscope （OM）, Scanning Electron Microscope （SEM） and X-ray Diffraction （XRD）. The micro-hardness and were-resisting property of the coatings were studied using micro-hardness tester and friction wear testing machine. The analysis shows that a metallurgical combination is formed between the laser cladding layer and the surface. All cladding coatings are composed of γ-Co and γ-Ni solid solutions as the matrix phase, Cr-Ni-Fe-C, （Mn, Cr） 7C3 and Cr23C6 as the wild phase. Furthermore, the phase compositions of St6＋5 % WC, St6＋ 5 % WC＋1 % RE also contain WC W2C and SiC phases. The micro-hardness of the cladding is in the range 560-710 HV0.2. Under the same testing conditions, the wear-resisting performance of the four materials is in the order： St6 ＋ 5% WC＋1%RE 〉 St6 ＋ 5% WC〉 St6 〉 H13 steel.
作者
杨晓红
杭文先
秦绍刚
刘勇兵
刘利萍
YANG Xiao-hong HANG Wen-xian QIN Shao-gang LIU Yong-bing LIU Li-ping(College of Materials Science and Engineerings Jilin University, Changchun 130022,China College of Engineering Branchy Changchun Vocational Institute of Technology ,Changchun 130033,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2017年第3期891-899,共9页
Journal of Jilin University:Engineering and Technology Edition
基金
吉林省发改委高技术产业发展专项项目(2013G038)
吉林省重点科技攻关项目(20160204017GX)
