增材制造H13钢表面熔覆Ni/WC涂层组织及性能研究  

Laser Cladding Ni/WC Composite on H13 Steel Fabricated by Additive Manufacturing

作　　者：严凯[1] 陈长军[1] 张敏[1] 秦兰兰[1] 任博[1] 王晓南[2] 邹涛[1,3] 

机构地区：[1]苏州大学机电工程学院激光加工中心,江苏苏州215021 [2]苏州大学沙钢钢铁学院,江苏苏州215021 [3]库卡工业徕斯机器人(昆山)有限公司,江苏苏州215300

出　　处：《应用激光》2017年第2期175-180,共6页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:51172221);苏州市科技计划资助项目(项目编号:SYG201642)

摘　　要：采用激光增材制造技术成功制备了H13钢,并在其表面熔覆Ni/WC复合涂层。利用扫描电子显微镜、能谱仪、XRD多晶衍射仪以及透射电镜对增材制造H13钢和涂层组织进行分析。结果表明,增材制造H13钢显微组织主要为板条马氏体以及分布在枝晶处的残余奥氏体和枝晶间隙处的碳化物组成;熔覆层和H13钢之间以及WC陶瓷相和Ni基合金之间均表现为良好的冶金结合。熔覆层底部呈粗大的短棒状枝晶,中部和上部由大量的团絮状和针状的共晶碳化物组成,基体由γ-Ni、M23C6、Ni3B等相组成,涂层和基体的硬度分别640HV和550HV。摩擦磨损实验结果表明,涂层的抗磨损性能是基体的2倍,耐磨性能得到提升。H13 steel was successfully fabricated by laser additive manufacturing technology and then the Ni/WC composite coating was coated on the surface of the steel. The microstructure of the steel and cladding layer were investigated by using scanning electron microscope （SEM） , X-ray diffraction （XRD） and Transmission Electron Microscope （TEM）. The results showed that the phase of produced H13 steel mainly consisted of retained austenitic along with martensite and fine carbides in the inter-dendrite space. There is a good metallurgical combination between ceramic phase WC particles and Ni-based alloy as well as H13 and cladding layer. The bottom of the cladding layer was characterized by coarse columnar dendrites, while the middle and upper area were composed of a large amount of flocculent and needle-like eutectic structures. The phases of the ma- trix mainly containy-Ni,M23 C6 ,Ni3 B. The hardness of the cladding layer and the substrate were 640 HV and 550 HV, respec- tively. The wear tests show that wear resistance of the cladding layer is twice as much as the substrate. The wear resistance was greatly increased.

关 键 词：激光增材制造 H13钢 显微组织 摩擦磨损 

分 类 号：TN249[电子电信—物理电子学] TG156.5[金属学及工艺—热处理]