H13钢表面激光熔覆耐磨涂层正交化工艺研究

发布时间：2018-04-28 02:43

本文选题：激光技术 + 搅拌摩擦焊　；参考：《激光技术》2015年03期

【摘要】：为了改善H13钢表面性能,采用激光熔覆方法,在H13钢表面制备了Co42高硬度涂层。对不同工艺下涂层的稀释率、粗糙度、表面形貌、显微组织及硬度分布等进行了测试分析。最佳工艺参量为离焦量20mm、扫描速率1.7mm/s、脉宽2.0ms、频率30Hz。此参量下制备的熔覆层厚度约为230μm,显微组织为致密细小的枝晶结构,与基底形成了良好的冶金结合。自熔覆层至基底,显微硬度梯度下降。熔覆层内的平均显微硬度为650HV0.1,为基体硬度(240HV0.1)的2.7倍,显著提高了H13钢的表面性能。结果表明,工艺参量(离焦量、扫描速率、脉宽、频率)对涂层的稀释率、粗糙度和表面形貌等有很大影响。这一结果对推动搅拌摩擦焊技术的发展是有帮助的。
[Abstract]:In order to improve the surface properties of H13 steel, Co42 high hardness coating was prepared on H13 steel by laser cladding. The dilution rate, roughness, surface morphology, microstructure and hardness distribution of the coatings were measured and analyzed. The optimum process parameters are as follows: defocus 20mm, scanning rate 1.7 mm / s, pulse width 2.0 Ms, frequency 30 Hz. The thickness of the cladding layer is about 230 渭 m, and the microstructure is dense and fine dendrite structure, forming a good metallurgical bond with the substrate. The microhardness gradient decreases from the cladding to the substrate. The average microhardness of the cladding layer is 650 HV0.1, 2.7 times of that of the substrate hardness of 240 HV0.1), and the surface properties of H13 steel are improved significantly. The results show that the process parameters (defocus, scanning rate, pulse width, frequency) have great influence on the dilution rate, roughness and surface morphology of the coating. This result is helpful to promote the development of friction stir welding technology.
【作者单位】：东北大学理学院;
【基金】：国家大学生创新性实验计划资助项目(130019) 中央高校基本科研业务费资助项目(N120405002) 教育部留学回国启动基金资助项目(第45批)
【分类号】：TG174.4

【参考文献】