【作者】 曲广福；

【导师】 张宏；

【作者基本信息】 长春理工大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 本试验研究，在GCr15钢表面上，采用预置涂层法在基材表面预置金属Ni基粉末和Co基粉末，通过不同的激光工艺参数对涂层表面进行多道搭接激光熔覆试验研究，进行了参数优化，获得了最佳的激光熔覆工艺参数。在此基础上借助光学显微镜、扫描电镜、X射线衍射仪、透射电镜、显微硬度计和摩擦磨损实验机等对激光熔覆层的合金元素分布、组织结构、显微硬度和磨损特性等进行了系统的研究。 研究结果表明：激光熔覆镍基和钴基粉末可以获得宏观质量好、无裂纹、气孔等缺陷且与基体呈冶金结合的熔覆层；激光熔覆层的硬度比基材的硬度有提高，抗磨损性能提高了2倍，激光熔覆层的组织紧密，覆层质量较高。更多还原

【Abstract】 In this paper, in order to improve the property of GCr15 steel, laser cladding of Ni powder and Co powder were investigated. The laser cladding parameters in the conditions of multi-pass laser joined cladding were studied, the microstructure, hardness, of laser cladding specimens were studied by using SEM、 TEM、 EDS、 XRD、 micro-hardness tester and wear tester.The results showed that by parameters optimizing of laser cladding, the cladding layer without of pores and cracks can be obtained, and an excellent bonding between the cladding layer and the substrate was gotten with a strong metallurgical interface. The performance of anti-weariness is improved by 2 times. The microstructure of laser cladding layer was in good quality.更多还原