反冲压力作用下激光选区熔化熔池热动力学行为

doi:10.3901/JME.2020.07.213

机械工程学报 ›› 2020, Vol. 56 ›› Issue (7): 213-219.doi: 10.3901/JME.2020.07.213

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反冲压力作用下激光选区熔化熔池热动力学行为

袁伟豪¹, 陈辉^1,2, 魏青松¹

1. 华中科技大学材料成形与模具技术国家重点实验室武汉 430074;
2. 新加坡国立大学机械工程学院新加坡 117575

收稿日期:2019-09-02 修回日期:2019-12-29 出版日期:2020-04-05 发布日期:2020-05-12
作者简介:袁伟豪,男,1995年出生。主要研究方向为激光选区熔化细观尺度模拟。E-mail:weihyuan@yeah.net;
魏青松(通信作者),男,1975年出生,博士,教授,博士研究生导师。主要研究方向为金属增材制造技术及应用。E-mail:wqs_xn@163.com
基金资助:
国家自然科学基金（51775207，51705170）、华中科技大学学术前沿团队、武汉市科技计划（2018010401011281）和中国博后科学基金（2018T110756）资助项目。

The Role of Recoil Pressure in Thermodynamic Behaviors of Molten Pool during Selective Laser Melting

YUAN Weihao¹, CHEN Hui^1,2, WEI Qingsong¹

1. State Key Lab of Materials and Die&Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074;
2. Department of Mechanical Engineering, National University of Singapore, Singapore 117575

Received:2019-09-02 Revised:2019-12-29 Online:2020-04-05 Published:2020-05-12

摘要/Abstract

摘要： 激光选区熔化(SLM)过程中，金属蒸发产生的反冲压力会改变熔池的热力学行为，导致零件缺陷。以316L不锈钢粉末为对象，通过数值模拟和试验测试，分析了不同激光工艺参数下反冲压力对熔池温度场和速度场的影响规律。其中，数值模型基于VOF多相流原理，充分考虑金属蒸发的反冲压力，同时结合了界面追踪热源模型。结果表明：固定激光线能量密度为300 J/m时，较大的扫描速度(1.0 m/s)会得到沿扫描方向更大范围的熔池，也会产生更深的凹陷；当激光扫描速度一定时(1.0 m/s)，熔池凹陷深度随激光功率增大而增大；并且凹陷深度越大，熔池深度越大，但沿扫描方向的熔池范围、熔化道表面形貌和宽度变化不大。

关键词: 激光选区熔化, 反冲压力, 熔池, 凹陷, 表面形貌

Abstract: During selective laser melting (SLM) process, the recoil pressure induced by metal evaporation affects the thermodynamic behaviors of molten pool, which may result in forming defects. Taking 316L stainless steel as an example, through computational and experimental methods, the effects of the recoil pressure on the thermodynamic behaviors of the molten pool are fully investigated. The established model is based on volume of fluid (VOF) multiphase theory with full consideration of recoil pressure combining ray-tracing heat source model. From the results, with a fixed laser linear energy density, the lager the laser scanning speed, the wider the molten pool range and larger the depression depth. With a fixed laser scanning speed (1.0 m/s), the larger the laser power, the larger depression depth, which further lead to elevated depth of molten pool, but the molten pool length along scanning direction, the width and surface morphology of solidified tracks change little.

Key words: selective laser melting, recoil pressure, molten pool, depression, surface morphology

中图分类号:

TG156

袁伟豪, 陈辉, 魏青松. 反冲压力作用下激光选区熔化熔池热动力学行为[J]. 机械工程学报, 2020, 56(7): 213-219.

YUAN Weihao, CHEN Hui, WEI Qingsong. The Role of Recoil Pressure in Thermodynamic Behaviors of Molten Pool during Selective Laser Melting[J]. Journal of Mechanical Engineering, 2020, 56(7): 213-219.

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反冲压力作用下激光选区熔化熔池热动力学行为

The Role of Recoil Pressure in Thermodynamic Behaviors of Molten Pool during Selective Laser Melting

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