Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies

ZHAO Xue; HE Ketai; LI Huaixue

doi:10.16080/j.issn1671–833x.2019.01/02.064

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Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies

更新时间：2025-10-30

- Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies
- Aeronautical Manufacturing Technology Vol. 62, Issue 1/2, (2019)
- 作者机构：
  
  1. 北京科技大学机械工程学院,北京,100083
  2. 中国航空制造技术研究院,北京,100024
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671–833x.2019.01/02.064
  CLC：
- Published：2019
- 稿件说明：
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赵雪，贺可太，李怀学. 扫描策略对选区激光熔化零件微观组织的影响[J]. 航空制造技术, 2019, 62(1/2): 64-71. ZHAO Xue, HE Ketai, LI Huaixue. Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies. Aeronautical Manufacturing Technology, 2019, 62(1/2): 64-71.

ZHAO Xue, HE Ketai, LI Huaixue. Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies[J]. Aeronautical Manufacturing Technology, 2019, 62(1/2).
赵雪，贺可太，李怀学. 扫描策略对选区激光熔化零件微观组织的影响[J]. 航空制造技术, 2019, 62(1/2): 64-71. ZHAO Xue, HE Ketai, LI Huaixue. Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies. Aeronautical Manufacturing Technology, 2019, 62(1/2): 64-71. DOI： 10.16080/j.issn1671–833x.2019.01/02.064.

ZHAO Xue, HE Ketai, LI Huaixue. Microstructure of Selective Laser Melting Parts Under Different Scanning Strategies[J]. Aeronautical Manufacturing Technology, 2019, 62(1/2). DOI： 10.16080/j.issn1671–833x.2019.01/02.064.

摘要

针对316L 不锈钢粉末选区激光熔化（SLM）过程，综合考虑了材料随温度变化的热物理属性及相变潜热的影响，开发了单层多道的三维温度场计算模型，模拟了不同扫描策略下熔池形态及温度场的分布，并与试验测量结果相比较，对比分析了不同扫描路径对零件微观组织的影响。仿真结果表明，随着扫描道的增加，熔道的最高温度有小幅度升高。通过试验观察，熔池内包含有大量柱状晶，沿着最大温度梯度方向竖直生长。另外，微观组织缺陷更易出现在热量累积及应力集中的扫描岛屿间的交界处，并且，扫描策略影响零件的微观组织及显微硬度，回形扫描方式较回形岛式扫描的晶粒细小，显微硬度高。

Abstract

A multi-track finite element model was developed to simulate melt pool contours and the temperature field during selective laser melting (SLM) of 316L stainless steel powder under different scanning strategies. Considering

the thermophysical properties changes with temperature and the influence of latent heat of phase. The simulated temperature field was compared with experimental measurements results. Furthermore

the presented results established a correlation between the scanning path and the microstructure of SLM specimens. The simulation results showed that as the scanning tracks increase

the maximum temperature of melt pool rises slightly. The molten pool contains a large number of columnar crystals that grow vertically along the direction of the maximum temperature gradient. In addition

microscopic defects are more likely to occur at the junction between scanning islands

where the heat and stress are concentrated. Besides

the scanning strategy affects the microstructure and microhardness of SLM parts

and the part under the spiral strategy had finer grains and higher Vicker hardness than that formed under spiral-island strategy.

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