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基于数值仿真的Al2O3陶瓷激光选区熔化表面微观组织形成机理研究

Formation Mechanism of Surface Microstructure in Selective Laser Melting of Alumina Ceramic Based on Numerical Simulation

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摘要

基于数值仿真和实验研究了Al2O3陶瓷激光选区熔化(SLM)成形表面凝固组织的形成机理。结果表明:Al2O3陶瓷SLM成形具备发生贝纳德-马兰戈尼表面失稳的条件,随着激光能量减小,对流接近稳态;基板预热能够改变贝纳德-马兰戈尼对流状态;低激光功率、快扫描速度、低预热温度有助于形成稳态液体表面的层流流动。

Abstract

On the basis of numerical simulation and experiments, the formation mechanism of solidification microstructures on the alumina ceramic surface by selective laser melting (SLM) is clarified. The research results show that as for the SLM of alumina ceramic, the forming condition of Bénard-Marangoni surface instability is satisfied. As laser energy decreases, the convection is close to its steady state. The preheating of substrate can change the Bénard-Marangoni convection state. Low laser power,fast scanning speed and low preheating temperature are all beneficial to the formation of a steady laminar flow on the liquid surface.

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中图分类号:TF249

DOI:10.3788/cjl201946.0202002

所属栏目:激光制造

基金项目:国家自然科学基金(51775281)、国家重点研发项目(2017YFB1103000)

收稿日期:2018-08-27

修改稿日期:2018-10-16

网络出版日期:2018-10-24

作者单位    点击查看

马瑞芩:南京理工大学机械工程学院, 江苏 南京 210094数控成形技术与装备国家地方联合工程实验室, 江苏 南京 210094
张凯:南京理工大学机械工程学院, 江苏 南京 210094数控成形技术与装备国家地方联合工程实验室, 江苏 南京 210094
韦辉亮:南京理工大学机械工程学院, 江苏 南京 210094数控成形技术与装备国家地方联合工程实验室, 江苏 南京 210094
刘婷婷:南京理工大学机械工程学院, 江苏 南京 210094数控成形技术与装备国家地方联合工程实验室, 江苏 南京 210094
廖文和:南京理工大学机械工程学院, 江苏 南京 210094数控成形技术与装备国家地方联合工程实验室, 江苏 南京 210094

联系人作者:刘婷婷(liutingting@mail.njust.edu.cn)

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引用该论文

Ma Ruiqin,Zhang Kai,Wei Huiliang,Liu Tingting,Liao Wenhe. Formation Mechanism of Surface Microstructure in Selective Laser Melting of Alumina Ceramic Based on Numerical Simulation[J]. Chinese Journal of Lasers, 2019, 46(2): 0202002

马瑞芩,张凯,韦辉亮,刘婷婷,廖文和. 基于数值仿真的Al2O3陶瓷激光选区熔化表面微观组织形成机理研究[J]. 中国激光, 2019, 46(2): 0202002

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