45 钢表面激光合金化组织分析及硬度测试

目的为了提高45钢表面性能,采用CO2激光器对其表面进行合金化处理。方法利用带有能谱的扫描电子显微镜(SEM/EDS)、金相显微镜、X射线衍射仪、显微/维氏硬度计、扫描电镜等,对合金化层组织及性能进行了观察和分析。结果激光合金化层由合金化区、结合区和热影响区3部分组成,涂层与基体呈冶金结合;涂层主要含Cr3C2,Fe Ni3,Cr23C6,Fe3C相;激光合金化层的显微硬度达1032 HV,约为基体的3.5倍。结论 45钢经激光合金化处理,可改善其表面性能,显著提高其硬度。

Microstructure Analysis and Hardness Test of Laser Alloying on 45 Steel Surfaces

In order to improve the surface properties of 45 steel, alloying treatment was carried out on its surface by CO2 laser. The microstructure and properties of the alloying layer were researched by means of scanning electron microscope with energy spectrum (SEM/ EDS), metallographic microscope, X-ray diffractometer and microscopic/ Vickers hardness tester. The coatings of laser alloying layer were constituted by alloying zone, bonding zone and heat affected zone, and the combination between the coating and the substrate was metallurgical. Cr3C2, FeNi3, Cr23C6 and Fe3C were the main phases in the alloying layer. The microhardness of the laser alloying layer reached 1032 HV, which was about 3. 5 times that of the substrate. After laser alloying treatment, the surface properties of 45 steel were improved and the hardness was significantly increased.