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对304不锈钢基材表面制备的激光熔覆层进行了高频微锻造处理。通过光学显微镜和X射线衍射仪分别研究了高频微锻造处理前后激光熔覆层的显微组织和相组成,利用显微维氏硬度计和电化学工作站分别对其进行了显微硬度测试和耐腐蚀性能测试。结果表明:经过高频微锻造处理后,激光熔覆层中的枝晶组织得到破碎,晶粒变细,但相组成无明显变化;微锻造作用区的显微硬度明显提高,影响深度为0.65 mm,表层硬度提高了约30%,高频微锻造处理对激光熔覆层的硬度影响程度随着距表层距离的增加而下降;激光熔覆层的耐腐蚀性能经微锻造处理后得到改善,为原始的2倍。
The laser cladding layer prepared on the surface of 304 stainless steel was micro-forged. The microstructure and phase composition of the laser cladding layer before and after high-frequency micro-forging were studied by optical microscope and X-ray diffractometer. The microhardness and phase composition of the laser cladding layer were measured by micro Vickers hardness tester and electrochemical workstation respectively. Corrosion resistance test. The results show that the dendritic structure in the laser cladding layer is broken and the grains are thinned after the high-frequency micro-forging treatment, but the phase composition does not change obviously. The microhardness of micro-forging zone increases obviously with the depth of 0.65 mm, surface hardness increased by about 30%, the impact of high frequency micro-forging on the hardness of the laser cladding layer with the distance from the surface layer decreases; corrosion resistance of the laser cladding layer after micro-forging improved, 2 times the original.