摘要
激光选区熔化(SLM)是一种通过激光扫描粉末床逐层构建的增材制造技术,通过SLM成型AlSi10Mg合金致密度高,能够保证结构整体质量。通过FLOW3D数值模拟,确定激光功率、扫描速度和扫描间距与SLM质量的关系,并在最优工艺参数下进行显微组织和力学性能分析。结果表明,随着激光功率的增大,线能量密度增大,导致单道熔池宽度逐渐增加,成型质量提高;随着扫描速度及扫描间距的增大,SLM成型致密度降低。在最优工艺参数下,发现SLM成型的AlSi10Mg试样内部组织分布不均匀,存在细晶区、粗晶区和热影响区。室温下的极限抗拉强度可达219 MPa,屈服强度为153 MPa,冲击功可达到5.8 J,试件XOY面和XOZ面的表面硬度分别为(130±5) HV和(120±5) HV。通过试验对比可以发现,SLM成型AlSi10Mg试样力学性能远大于ZAlSi9Mg,接近于挤压型材6061铝合金,能够满足快速增材制造的应用需求。
Selective Laser Melting(SLM)is an additive manufacturing technology that builds layer-by-layer through a laserscanned powder bed.The AISiloMg alloy formed by SLM has a high density and can ensure the overall quality of the structure.In this paper,the relationship between laser power,scanning speed,scanning distance,and the quality of SLM was determined through FLOW3D numerical simulation.The microstructure and mechanical properties were analyzed under the optimal process parameters.The results showed that the linear energy density will increase with the increase of laser power,resulting in a gradual increase in the width of the single-channel molten pool,so the forming quality increases.With the increase of scanning speed and scanning distance,the density of SLM molding decreases.Under the optimal process parameters,it is found that the internal microstructure distribution of the SLM-formed AiSiloMg sample is uneven,and there are fine-grained,coarse-grained,and heat-affected zones.The ultimate tensile strength at room temperature can reach 219 MPa,the yield strength can reach 153 MPa,and the impact energy can reach 5.8 J.The surface hardness of XOY plane and XOZ plane are(130±5)HV and(120±5)HV,respectively.Through experimental comparison,it can be found that the mechanical properties of the SLMformed AISil0Mg sample are much larger than that of ZAISi9Mg,which is close to the extruded 6061 aluminum alloy and can meet the application requirements of rapid additive manufacturing.
作者
田军
谢迁成
龙樟
温飞娟
Tian Jun;Xie Qiancheng;Long Zhang;Wen Feijuan(School of Mechatronic Engineering,Southwest Petroleum University,Nanchong 637000,Sichuan,China;Nanchong Key Laboratory of Robotics Engineering and Intelligent Manufacturing,Southwest Petroleum University,Nanchong 637000,Sichuan,China;School of New Energy and Materials,Southwest Petroleum University,Nanchong 637000,Sichuan,China)
出处
《应用激光》
CSCD
北大核心
2023年第9期37-48,共12页
Applied Laser
基金
南充市-西南石油大学市校科技战略合作专项(SXQHJH034,SXQHJH027)
四川省2021-2023年高等教育人才培养质量和教学改革项目(JG2021-639)
教育部2021年第一批产学合作协同育人项目(202101398047,202102500012)。
