激光熔丝增材制造过程的温度与组织演变研究

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 邸艳艳 DI Yanyan 1 first-author 黄安国 HUANG Anguo 1 叶杰 YE Jie 1 华中科技大学材料成形与模具技术国家重点实验室 华中科技大学材料成形与模具技术国家重点实验室 State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology 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。 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. 激光熔丝增材 温度场 组织演变 laser fuse additive temperature field microstructural evolution TG665 2022-03-08 8 51