封面 书名页 版权页 前言 彩插 目录页 Chapter 1 Introduction 1.1 Background 1.2 Motivation 1.3 Outline Chapter 2 Investigation of the flow field in Laser-based Powder Bed Fusion manufacturing 2.1 Introduction 2.2 Simulation model of the L-PBF printer 2.2.1 Problem description 2.2.2 Geometric model of the L-PBF printer 2.2.3 Numerical model of the L-PBF printer 2.3 Simulation results 2.3.1 Distribution of the flow field 2.3.2 Distribution of the temperature field 2.3.3 Distribution of spatter particles 2.4 Conclusions References Chapter 3 Investigation of optimizing the flow field with fluid cover in Laser-based Powder Bed Fusion manufacturing process 3.1 Introduction 3.2 Simulation model of L-PBF printer 3.2.1 Geometry of L-PBF printer with a fluid stabilizing cover 3.2.2 Numerical model of printer with a fluid stabilizing cover 3.2.3 Mesh of L-PBF printer with a fluid stabilizing cover 3.2.4 Model of the fluid stabilizing cover and particles 3.3 Simulation results and discussion 3.3.1 Influence of the fluid stabilizing cover on the flow field 3.3.2 Influence of fluid stabilizing cover on particle distribution and removing rate 3.4 Summary and conclusions References Chapter 4 Numerical investigation of controlling spatters with negative pressure pipe in Laser-based Powder Bed Fusion process 4.1 Introduction 4.2 Simulation model of L-PBF printer 4.2.1 Geometric model of L-PBF printer 4.2.2 Numerical model of L-PBF printer 4.3 Simulation results and discussions 4.3.1 Effect of pipe diameter 4.3.2 Effect of outlet flow rate 4.3.3 Effect of initial particle velocity 4.4 Summary and conclusions References Chapter 5 Evolution of molten pool during Laser-based Powder Bed Fusion of Ti-6Al-4V 5.1 Introduction 5.2 Modeling approach and numerical simulation 5.2.1 Model establishing and assumptions 5.2.2 Governing equations 5.2.3 Heat source model 5.2.4 Phase change 5.2.5 Boundary conditions setup 5.2.6 Mesh generation 5.3 Experimental procedures 5.4 Results and discussions 5.4.1 Surface temperature distribution and morphology 5.4.2 Formation and solidification of the molten pool 5.4.3 Development of the evaporation region 5.5 Conclusions References Chapter 6 Simulation of surface deformation control during Laser-based Powder Bed Fusion Al-Si-10Mg powder using an external magnetic field 6.1 Introduction 6.2 Modeling and simulation 6.2.1 Modeling of L-PBF 6.2.2 Mesh model and basic assumptions 6.2.3 Heat transfer conditions 6.2.4 Marangoni convection 6.2.5 Phase-change material 6.2.6 Lorentz force 6.3 Results 6.3.1 Velocity field in the molten pool 6.3.2 Lorentz force in the MP 6.3.3 Surface deformation of the sample 6.4 Conclusions References Chapter 7 Influence of laser post-processing on pore evolution of Ti-6Al-4V alloy by Laser-based Powder Bed Fusion 7.1 Introduction 7.2 Experimental procedures 7.2.1 Sample fabrication 7.2.2 Determination of porosity by micro-CT 7.3 Modeling and simulation 7.3.1 Numerical model 7.3.2 Moving Gaussian heat source 7.3.3 Thermal boundary conditions 7.3.4 Marangoni effect,surface tension and recoil pressure 7.4 Numerical results and discussion 7.5 Conclusions References Chapter 8 Evolution of multi pores in Ti-6Al-4V/Al-Si-10Mg alloy during laser post-processing 8.1 Introduction 8.2 Experimental procedures 8.2.1 Sample preparation 8.2.2 Detection of porosity by mirco-CT 8.3 Model and simulation 8.3.1 Simulation model 8.3.2 Gaussian heat source 8.3.3 Latent heat of phase change 8.3.4 Level-set method 8.3.5 Boundary conditions 8.4 Numerical results and discussion 8.5 Conclusions References Chapter 9 Investigation of laser polishing of four Laser-based Powder Bed Fusion alloy samples 9.1 Introduction 9.2 Model and theoretical calculation 9.2.1 Physical model and assumptions 9.2.2 Governing equations and boundary conditions 9.2.3 Simulation results 9.3 Experimental methods 9.3.1 Sample fabrication 9.3.2 Morphology observation by 3D optical profiler 9.3.3 Experimental results 9.4 Conclusions References ..更多