中国激光, 2011, 38 (10): 1003010, 网络出版: 2011-09-27
液氩冷却对316 L激光金属直接成形零件组织和显微硬度的影响
Influence of Liquid Argon Cooling on the Microstructure and Microhardness of 316 L Stainless Steel in Laser Metal Direct Forming
激光技术 激光金属直接成形 液氩冷却 柱状晶 显微硬度 laser technique laser metal direct forming liquid argon cooling columnar crystals microhardness
摘要
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12 μm，并且提高了实体墙零件的显微硬度值。
Abstract
In order to keep the proper temperature gradient of molten pool in the process of solidification and then make the columnar crystals grow from substrate during laser metal direct forming, the liquid argon is sprayed to the two sides to refrigerate entity-wall; and the influence of liquid argon cooling on microstructure and microhardness of 316 L stainless steel parts are investigated. It can be concluded from the experiments that heat accumulation can be reduced effectively, the most of columnar crystals grow from substrate continuously, the biggest primary spacing of dendrites is about 35 μm and the microhardness of entity-wall increases obviously.
贺斌, 李涤尘, 张安峰, 鲁中良, 付伟, 路桥潘. 液氩冷却对316 L激光金属直接成形零件组织和显微硬度的影响[J]. 中国激光, 2011, 38(10): 1003010. He Bin, Li Dichen, Zhang Anfeng, Lu Zhongliang, Fu Wei, Lu Qiaopan. Influence of Liquid Argon Cooling on the Microstructure and Microhardness of 316 L Stainless Steel in Laser Metal Direct Forming[J]. Chinese Journal of Lasers, 2011, 38(10): 1003010.
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