激光熔丝增材制造过程的温度与组织演变研究

邸艳艳; 黄安国; 叶杰

doi:10.7512/j.issn.1001-2303.2021.08.19

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激光熔丝增材制造过程的温度与组织演变研究
Study on temperature and microstructure evolution during laser fuse additive manufacturing
2021年51卷第8期页码：141-145
纸质出版：2021
DOI： 10.7512/j.issn.1001-2303.2021.08.19
稿件说明：

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邸艳艳, 黄安国, 叶杰. 激光熔丝增材制造过程的温度与组织演变研究[J]. 电焊机, 2021,51(8):141-145. DOI： 10.7512/j.issn.1001-2303.2021.08.19.

DI Yanyan, HUANG Anguo, YE Jie. Study on temperature and microstructure evolution during laser fuse additive manufacturing[J]. Eletric Welding Machine, 2021, 51(8): 141-145. DOI： 10.7512/j.issn.1001-2303.2021.08.19.

摘要

激光熔丝增材制造工艺参数对凝固组织特别是晶粒尺寸有重要影响

从而影响成形件的性能。基于有限元方法对激光熔丝增材316L不锈钢过程的热历史进行了仿真

研究了不同增材工艺对晶粒尺寸的影响。结果表明

模拟得到的熔池尺寸于与实际相吻合

在垂直于扫描方向和厚度方向均有能量传递。随着扫描速度的增加

成形过程的最高温度减小。单层组织的底部区域为胞状晶、中部区域为粗大的柱状树枝晶、顶部区域为细小的等轴晶

柱状树枝晶的一次枝晶间距随扫描速度的增加而减小。

Abstract

The laser fuse additive manufacturing parameters have an important influence on the solidification structure

especially the grain size

which affects the properties of the formed parts. Based on the finite element method

the thermal history of 316L stainless steel was simulated

and the effects of different additive manufacturing processes on grain size were studied. The results show that that the size of the molten pool obtained by simulation is consistent with the reality

and the energy transfer is vertical to the scanning direction and the thickness direction. With the increase of scanning speed

the maximum temperature of forming process decreases. The bottom region of the monolayer microstructure is cellular crystal

the middle region is large columnar dendritic crystal

and the top region is fine equiaxed crystal. The primary dendrite spacing of columnar dendrites reduces as the scanning speed increases.