中国激光, 2019, 46 (11): 1102007, 网络出版: 2019-11-09   

镍基单晶高温合金选区激光熔化成形工艺及组织 下载: 1140次

Process Parameters and Microstructure of Ni-Based Single Crystal Superalloy Processed by Selective Laser Melting
作者单位
1 郑州科技学院机械工程学院, 河南 郑州 450064
2 华中科技大学武汉光电国家实验室, 湖北 武汉 430074
摘要
采用选区激光熔化(SLM)技术,研究了工艺参数对成形SRR99镍基单晶高温合金裂纹、气孔、显微组织等的影响。结果表明,在激光功率一定的条件下,设置合理的扫描速度、扫描间距、分层厚度可成形高致密度试样。激光体能量密度是影响SRR99合金裂纹和气孔的重要因素。裂纹数量和尺寸随激光体能量密度的增大急剧增加。裂纹大多始于熔覆层的层间交界处,有明显的沿晶开裂特征。激光体能量密度过低时,气孔呈不规则形;随着激光体能量密度增大,气孔形貌向圆形转变。SLM沉积试样组织为微细的枝晶组织,一次枝晶间距随沉积高度的增加略有增大,二次枝晶不发达。
Abstract
To investigate the impacts of process parameters on the cracking behavior, porosity, and microstructure, an SRR99 nickel-based superalloy was fabricated by selective laser melting (SLM) technology. The results show that high-density samples can be prepared by setting reasonable scanning velocity, hatch spacing, and layer thickness under the fixed laser power. The laser volume energy density is the main parameter that affects crack and porosity of the SRR99 nickel-based superalloy. The number and size of cracks increase sharply as the laser volume energy density rises. It is found that most of the cracks originate in the interface of cladding layers and propagate along intergrain boundaries. At the same time, the pores are irregularly shape when the laser volume energy density is inadequate, whereas they gradually transform from irregularity to roundness with the increase of the laser volume energy density. The microstructures of the SLM deposition samples are superfine columnar dendrites. In addition, the primary dendrite spacing increases slightly with the increase of building height, and secondary dendrite arms are underdeveloped.

潘爱琼, 张辉, 王泽敏. 镍基单晶高温合金选区激光熔化成形工艺及组织[J]. 中国激光, 2019, 46(11): 1102007. Aiqiong Pan, Hui Zhang, Zemin Wang. Process Parameters and Microstructure of Ni-Based Single Crystal Superalloy Processed by Selective Laser Melting[J]. Chinese Journal of Lasers, 2019, 46(11): 1102007.

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