Ni＋WC基粉末激光熔覆对柱塞组织和硬度的影响
Effect of Laser Cladding Ni+WC Powder on Microstructure and Hardness of Plunger Piston
赵勇桃1, 李文学1, 蔺文跃2, 赵能怀2
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作者单位：(1. 内蒙古科技大学 材料与冶金学院, 内蒙古 包头 014010; 2. 包头光通科技有限公司, 内蒙古 包头 014010)
中文关键字：Ni+WC基粉末； 激光熔覆； 柱塞； 组织； 硬度
英文关键字：Ni+WC powder; laser cladding; plunger piston; microstructure; microhardness
中文摘要：采用Ni＋WC基粉末激光熔覆对严重磨损的高压水除鳞机用柱塞表面进行修复，利用光学显微分析和扫描电子显微分析方法，对熔敷层、结合层和基体进行显微组织观察及能谱分析，并测定了不同区域的显微硬度。结果表明：国外试样的基体是铁素体和奥氏体组成的双相钢，过渡层为Ni25、熔覆层为Ni60+WC的试样，熔覆层的组织分布均匀，熔覆层有大量的WC质点分布，显微硬度值较高，峰值硬度为1000 HV。
英文摘要：The laser cladding Ni＋WC power technology was used to repair plunger piston surface. The microstructure of cladding layer, binder course and matrix were observed by OM and SEM analysis. Besides, different zones of micro-hardness was measured through micro-hardness testing. The results show that the microstructure of foreign samples, matrix is ferrite and austenite. The sample is composed of transitional layer (Ni25) and cladding layer(Ni60+WC). The microstructure of the cladding layer is uniform and a lot of WC hard particles exist in it, the max value of microhardness is up to 1000 HV.