H13钢激光熔覆钴基复合涂层的组织及耐磨性

发布时间：2018-01-20 12:39

本文关键词： 金属材料激光熔覆 H钢钴基自熔性粉末　出处：《吉林大学学报(工学版)》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:Stellite-6 laser cladding Stellite-6 (Stellite-6) on the surface of H13 hot die steel is carried out by using a 5kW continuous CO_2 laser. St6 5 WC1 / RE Co-based alloy composite coating. The microstructure of the cladding layer was studied by means of optical microscope, scanning electron microscope, X-ray diffractometer, microhardness tester and wear tester. The elemental distribution, phase composition, microhardness and wear properties were systematically studied. The results show that the laser cladding layer is metallurgical bonded with the substrate, and the matrix microstructure of each cladding layer is 纬 -Co, 纬 -Ni. The structure of the reinforced phase includes Cr-Ni-Fe-C, Mn-Mn-Cr-O, and the other phases, such as the structure of 7C3CrS-1, the structure of the structure of the enhanced phase, and the other phases, such as 23C6. St6 _ 5WC and St6 _ 5WC _ 1 have increased WCC WSP 2C and SiC phase in the strengthening phase of RE cladding layer; The microhardness of the cladding is 560,710HV. The results of friction and wear tests show that under the same conditions, the order of wear resistance from high to low is St6 _ 5WC _ (1) and St6 _ (65) WCC _ (6) H _ (13) steel.
【作者单位】：吉林大学材料科学与工程学院;长春职业技术学院工程分院;
【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)
【分类号】：TG174.4
【正文快照】： 0引言热锻模具在急冷急热环境下很容易产生热疲劳裂纹、热磨损及早期开裂等形式的失效。热锻模具失效的初始破坏大多是从材料表面开始的[1]。因此,表面强化技术在模具表面进行改性和修复中具有重要的意义[2]。利用激光熔覆技术对模具进行表面改性,可以改善其表面硬度、耐磨性

【相似文献】