NAK80模具钢表面激光熔覆钴基合金涂层的组织和摩擦磨损性能
Microstructure and Friction and Wear Properties of Laser Clad Co-Based Alloy Coating on Surface of NAK80 Mold Steel
摘 要
采用激光熔覆方法在NAK80模具钢表面制备钴基合金熔覆层, 用扫描电镜、X射线衍射仪分析了熔覆层的显微组织, 通过干滑动摩擦试验研究了熔覆层的摩擦磨损性能, 分析了其磨损机制, 并用三维表面形貌仪观察磨损试样的表面形貌。结果表明: 熔覆层的主要组成相为Cr23C6、Co3Mo2Si、MoC、FeCr和γ-Co; 熔覆层由涂层与基体界面处的平面晶区、涂层中部的胞状树枝晶区和表层的网状等轴晶粒区组成; 经激光熔覆处理后的NAK80模具钢表面硬度和耐磨性得到了显著改善, 与NAK80模具钢相比, 熔覆层表面的平均摩擦因数降低了约34%, 比磨损率下降了约91.3%; 熔覆层的磨损机制为粘着磨损和轻微的显微切削。
钴基合金
NAK80模具钢
组织
摩擦磨损性能
laser cladding
Co-based alloy
NAK80 mold steel
microstructure
friction and wear property
Abstract
The Co-based alloy cladding coating was successfully fabricated on the surface of NAK80 mold steel by laser cladding technology. The microstructure of the coating was analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD). The property of friction and wear, and the wear mechanism were studied by the dry sliding friction test. The morphology of wear samples were measured by 3D surface profilometer. The results show that the cladding coating was mainly composed of Cr23C6, Co3Mo2Si, MoC, FeCr and γ-Co. The plane crystal in the interface of the coating and the substrate, cellular dendrite at the central zone and reticular equiaxed crystal near top surface were observed in the cladding coating. The microhardness and wear resistance of NAK80 mold steel surface were improved noticeably by laser cladding technology. Compared with NAK80 mold steel, the average friction coefficient of the cladding coating decreased by about 34%, and the wear rate reduced by about 91.3%. The wear mechanism for the laser cladding coating was adhesive wear and slight micro-cutting.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51002101); 台州学院培育基金资助项目(2011PY31)
收稿日期 2011/8/1
修改稿日期 2012/4/21
网络出版日期
作者单位点击查看
备注程虎(1981-), 男, 江西九江人, 讲师, 硕士。
引用该论文: CHENG Hu,DAI Sheng,FANG Zhi-gang,ZHAO Xian-rui,GAO Yu-xin. Microstructure and Friction and Wear Properties of Laser Clad Co-Based Alloy Coating on Surface of NAK80 Mold Steel[J]. Materials for mechancial engineering, 2012, 36(8): 37～41
程虎,戴晟,方志刚,赵先锐,高玉新. NAK80模具钢表面激光熔覆钴基合金涂层的组织和摩擦磨损性能[J]. 机械工程材料, 2012, 36(8): 37～41
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【12】李志远, 赵伟毅, 聂登攀, 等.TiN对Co基合金激光熔覆层组织与性能的影响[J].强激光与粒子束, 2010, 22(7):1657-1660.
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