内容提要 本书针对金属增材制造加工过程进行了系统研究,基于计算流体动力学方法研究金属增材制造工艺过程中的流体问题。章为绪论。第二章至第四章研究金属增材制造打印机腔体内部流场及颗粒分布特性,并设计了新颖的流体罩和负压管对打印机腔体内部流场优化以及溅射颗粒清除。第五章至第九章主要研究金属增材制造加工过程中熔池特性,其中第五章研究了金属熔池动力学特性,第六章研究了外加磁场对金属增材制造过程中熔池以及凝固过程的影响,第七章和第八章研究了金属增材制造过程中工件内部单气孔缺陷和多气孔缺陷的演化过程。第九章研究金属增材制造工件激光清洗工艺,以控制工件表面粗糙度。 本次主要修订了技术内容的专业描述,更新了部分结果。 目录 Chapter 1 Introductiont11.1 Backgroundt21.2 Motivationt31.3 Outlinet4Chapter 2 Investigatioof the flow field iLaser-based Powder Bed Fusiomanufacturingt52.1 Introductiont72.2 Simulatiomodel of the L-PBF printert102.2.1 Problem descriptiont102.2.2 Geometric model of the L-PBF printert112.2.3 Numerical model of the L-PBF printert122.3 Simulatioresultst162.3.1 Distributioof the flow fieldt162.3.2 Distributioof the temperature fieldt212.3.3 Distributioof spatter particlest232.4 Conclusionst28Referencest30Chapter 3 Investigatioof optimizing the flow field with fluid cover iLaser-based Powder Bed Fusiomanufacturing processt333.1 Introductiont353.2 Simulatiomodel of L-PBF printert373.2.1 Geometry of L-PBF printer with a fluid stabilizing covert373.2.2 Numerical model of printer with a fluid stabilizing covert373.2.3 Mesh of L-PBF printer with a fluid stabilizing covert393.2.4 Model of the fluid stabilizing cover and particlest403.3 Simulatioresults and discussiont433.3.1 Influence of the fluid stabilizing cover othe flow fieldt433.3.2 Influence of fluid stabilizing cover oparticle distributioand removing ratet473.4 Summary and conclusionst51Referencest53Chapter 4 Numerical investigatioof controlling spatters with pressure pipe iLaser-based Powder Bed Fusioprocesst544.1 Introductiont564.2 Simulatiomodel of L-PBF printert594.2.1 Geometric model of L-PBF printert594.2.2 Numerical model of L-PBF printert614.3 Simulatioresults and discussionst644.3.1 Effect of pipe diametert684.3.2 Effect of outlet flow ratet704.3.3 Effect of initial particle velocityt744.4 Summary and conclusionst76Referencest78Chapter 5 Evolutioof moltepool during Laser-based Powder Bed Fusioof Ti-6Al-4Vt805.1 Introductiont825.2 Modeling approach and numerical simulationt855.2.1 Model establishing and assumptionst855.2.2 Governing equationst875.2.3 Heat source modelt875.2.4 Phase changet885.2.5 Boundary conditions setupt895.2.6 Mesh generationt905.3 Experimental procedurest915.4 Results and discussionst925.4.1 Surface temperature distributioand morphologyt925.4.2 Formatioand solidificatioof the moltepoolt945.4.3 Development of the evaporatioregiont985.5 Conclusionst101Referencest103Chapter 6 Simulatioof surface deformatiocontrol during Laser-based Powder Bed FusioAl-Si-10Mg powder using aexternal magnetic fieldt1076.1 Introductiont1096.2 Modeling and simulationt1126.2.1 Modeling of L-PBFt1126.2.2 Mesh model and basic assumptionst1136.2.3 Heat transfer conditionst1146.2.4 Marangoni convectiont1156.2.5 Phase-change materialt1156.2.6 Lorentz forcet1166.3 Resultst1186.3.1 Velocity field ithe moltepoolt1186.3.2 Lorentz force ithe MPt1216.3.3 Surface deformatioof the samplet1236.4 Conclusionst127Referencest128Chapter 7 Influence of laser post- processing opore evolutioof Ti-6Al-4V alloy by Laser-based Powder Bed Fusiont1317.1 Introductiont1337.2 Experimental procedurest1367.2.1 Sample fabricationt1367.2.2 Determinatioof porosity by micro-CTt1377.3 Modeling and simulationt1407.3.1 Numerical modelt1407.3.2 Moving Gaussiaheat sourcet1437.3.3 Thermal boundary conditionst1437.3.4 Marangoni effect, surface tensioand recoil pressuret1447.4 Numerical results and discussiont1457.5 Conclusionst152Referencest153Chapter 8 Evolutioof multi pores iTi-6Al-4V/Al-Si-10Mg alloy during laser post-processingt1578.1 Introductiont1598.2 Experimental procedurest1628.2.1 Sample preparationt1628.2.2 Detectioof porosity by mirco-CTt1628.3 Model and simulationt1658.3.1 Simulatiomodelt1658.3.2 Gaussiaheat sourcet1678.3.3 Latent heat of phase changet1688.3.4 Level-set methodt1698.3.5 Boundary conditionst1698.4 Numerical results and discussiont1718.5 Conclusionst177Referencest179Chapter 9 Investigatioof laser polishing of four Laser-based Powder Bed Fusioalloy samplest1829.1 Introductiont1849.2 Model and theoretical calculationt1889.2.1 Physical model and assumptionst1889.2.2 Governing equations and boundary conditionst1909.2.3 Simulatioresultst1929.3 Experimental methodst1959.3.1 Sample fabricationt1959.3.2 Morphology observatioby 3D optical profilert1989.3.3 Experimental resultst1999.4 Conclusionst206Referencest208 作者介绍
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