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为提高F325堆焊层的韧性,进行了激光堆焊F325与钼丝的实验。利用金相显微镜、维氏硬度仪等设备分析、测试了堆焊层的显微组织和硬度。研究表明:激光堆焊可以得到晶粒细化,组织致密,无裂纹、气孔等缺陷,与基体冶金结合的F325/钼丝复合材料覆层;钼丝外表面轻微熔化,与F325基体呈冶金结合;钼丝加入后,使其周边的晶粒大大细化,并抑制了碳化物的长大;钼丝与F325结合区的平均硬度为750HV0.2,高于F325堆焊层的平均硬度650HV0.2。
In order to improve the toughness of F325 surfacing layer, the experiment of laser surfacing F325 and molybdenum wire was carried out. The microstructure and hardness of the overlay were tested by metallographic microscope and Vickers hardness tester. The results show that laser cladding can obtain F325 / molybdenum wire composite coating with grain refinement, compact structure, no cracks and porosity, and the metallurgical bonding with the F325 / molybdenum wire composite cladding. The outer surface of the molybdenum wire slightly melts and metallurgically bonds with the F325 matrix After the molybdenum wire was added, the grains around it were greatly refined and the carbide growth was inhibited. The average hardness of molybdenum wire and F325 combined zone was 750 HV0.2, which was higher than the average hardness of F325 surfacing layer of 650 HV0. 2.