选区激光熔融过程中多热源扫描的热力耦合有限元分析  

Thermalmechanical-coupled finite element analysis of multi-heat source scanning in SLM process

作　　者：王长顺 王齐胜 林昕 朱锟鹏 Wang Changshun;Wang Qisheng;Lin Xin;Zhu Kunpeng(0x09 College of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China;Institute of Intelligent Machinery,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Research Center of Intelligent Equipment Technology,Changzhou Institute of Advanced Manufacturing Technology,Changzhou 213164,China)

机构地区：[1]武汉科技大学机械自动化学院,湖北武汉430081 [2]中国科学院合肥物质科学研究院智能机械研究所,安徽合肥230031 [3]常州先进制造技术研究所智能装备技术研究中心,江苏常州213164

出　　处：《武汉科技大学学报》2023年第6期451-456,共6页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金项目(52175481)。

摘　　要：选区激光熔融(SLM)多热源扫描在提升工件成形效率方面具有潜力。针对316L不锈钢的SLM多热源扫描过程,本文建立了三维热力耦合有限元模型,分析了热源数量对单层SLM成形过程中温度场和应力场的影响。结果表明,随着热源数量的增加,SLM扫描过程中熔池的最高温度、尺寸均有所上升,同时有助于减少扫描的搭接次数。在应力方面,多热源扫描能缩小应力集中区域,且应力主要集中在搭接处,这虽然会导致最大应力的小幅上升,但模拟结果显示,预热方法能有效缓解多热源扫描引起的残余应力增加。Selective laser melting(SLM)with multi-heat source scanning offers potential advantages in enhancing forming efficiency of workpieces.In the context of 316L stainless steel undergoing SLM with multi-source scanning,a 3D thermomechanical finite element model was established to investigate the effects of the number of heat sources on the temperature and stress fields during single-layer SLM forming.The results indicate that as the number of heat sources increases,there’s a corresponding rise in the peak temperature and size of melt pool during scanning,simultaneously aiding in the reduction of overlapping scanning frequencies.In terms of stresses,multi-heat source scanning is able to narrow down the stress concentration area,with stresses predominantly concentrated at overlaps.Although this may result in a slight increase in peak stress values,simulation results indicate that preheating can effectively mitigate the residual stress amplification induced by multi-heat source scanning.

关 键 词：选区激光熔融 多热源扫描 热力耦合 316L不锈钢 有限元分析 

分 类 号：TG146[一般工业技术—材料科学与工程]