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在激光金属直接成形过程中,为了使熔池在凝固时始终保持合理的温度梯度从而使成形件内部柱状晶组织自基板起从下到上延续生长,在成形316 L实体墙过程中采用液氩喷射冷却的方法降低成形件的温度;分析了液氩喷射冷却对实体墙金相组织和显微硬度的影响。结果显示,采用液氩喷射冷却能有效缓解激光金属直接成形过程中成形件内部的热积累现象,使柱状晶组织在实体墙内部从基板开始从下到上延续生长,一次枝晶间距最大处约为12μm,并且提高了实体墙零件的显微硬度值。
In the direct laser metal forming process, in order to make the molten pool in the solidification always maintain a reasonable temperature gradient so that the interior of the columnar crystal structure from the bottom of the substrate from the continued growth of 316L solid wall in the process of forming liquid argon Jet cooling method to reduce the temperature of the formed part; the effect of liquid argon jet cooling on the microstructure and microhardness of the solid wall was analyzed. The results show that the liquid argon jet cooling can effectively relieve the heat accumulation inside the formed parts during the laser direct metal forming process, so that the columnar crystal structure grows continuously from bottom to top within the solid wall, and the maximum dendrite spacing 12μm, and increased the solid wall parts of the microhardness value.