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在Ti6Al4V合金表面进行了激光熔覆Ni包MoS_2/NiCrBSi复合涂层的试验,利用OM、SEM、EDS等分析了扫描速度对熔覆层宏观形貌、显微组织、显微硬度、裂纹敏感性的影响,为合理选择激光熔覆工艺参数提供了理论依据。试验结果表明,在其他工艺参数不变的条件下,随扫描速度的增大,熔覆层宽度、厚度、基底材料熔化深度、热影响区深度均减小;显微组织细化,结合区胞状晶逐渐消失;涂层的显微硬度降低,裂纹敏感性增大。
The laser cladding of Ni-coated MoS_2 / NiCrBSi composite coating on Ti6Al4V alloy surface was carried out. The effects of scanning speed on the morphology, microstructure, microhardness and crack susceptibility of the cladding layer were analyzed by OM, SEM and EDS The results provide a theoretical basis for the reasonable selection of laser cladding parameters. The experimental results show that the width and thickness of the cladding layer, the depth of the base material melting and the depth of heat affected zone (HAZ) decrease with the increase of the scanning speed under the condition of the other parameters unchanged. The microstructure is refined, Crystals gradually disappear; coatings reduce the microhardness, crack sensitivity increased.