Abstract: Laser remelting during SLM forming can improve metallurgical quality and performance, but the effect of laser remelting on the temperature field is still unclear. In this work, we use the finite element method to establish a model of 316L stainless steel, compare the temperature field characteristics of unremelted and remelted, and analyse the temperature results under different remelting process parameters; using prepared samples to analyse the density and pore size under different remelting process parameters. The results show that laser remelting has a good preheating effect, with a minimum temperature increase of approximately 69% for single-layer forming and only a 10% increase for multi-layer forming due to the effect of heat diffusion. The laser remelting process has no effect on the maximum temperature of the first laser scan, but can increase the temperature of the second scan. The remelting laser energy density increase from 29 to 117 J/m, with a maximum temperature increase of 36.40% and a minimum temperature increase of 12%. The improvement in density is not significant, but there is a significant reduction in pore size. When the laser remelting energy density is 50 J/m, the density is as high as 99.95% and the depth and width of the pores decreased by 64.9% and 35.2%.
通讯作者: *郑志军,华南理工大学教授,1998 年于重庆建筑大学获学士学位,2003 年和 2012 年于华南理工大学分别获得硕士和博士学位。2016 年在澳大利亚联邦科学与工业研究院(CSIRO)做访问学者。主要从事块体纳米材料的双尺度结构的形成机制与微观电化学行为以及金属 3D打印材料的组织表征与腐蚀行为方面的研究。在国内外著名刊物发表论文 50 多篇,包括Corrosion Science、Journal of Solid State Electrochemistry和 Materials Science and Engineering A等。发明专利 5 项。主持或参与国家自然科学基金、省部产学研项目、省攻关、省基金等国家级、省市级项目及企业横向等项目 30 多项。zjzheng@scut.edu
引用本文:
郑志军, 郑翔. 基于激光重熔的SLM成形316L不锈钢温度场仿真及工艺优化[J]. 材料导报, 2024, 38(17): 23030304-7.
ZHENG Zhijun, ZHENG Xiang. Temperature Field Simulation and Process Optimization of SLM Forming of 316L Stainless Steel Based on Laser Remelting. Materials Reports, 2024, 38(17): 23030304-7.
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2024, Vol. 38 
