A5071379797- Additive Manufacturing Materials and Processes
- Welding Techniques and Residual Stresses
- Additive Manufacturing and 3D Printing Technologies
- Aluminum Alloy Microstructure Properties
- Laser Material Processing Techniques
- Solidification and crystal growth phenomena
- Advanced Welding Techniques Analysis
- High Entropy Alloys Studies
- Manufacturing Process and Optimization
- Microstructure and mechanical properties
- Metallurgy and Material Forming
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Non-Destructive Testing Techniques
- Engineering Technology and Methodologies
- Advanced materials and composites
- High-Temperature Coating Behaviors
- Urban Stormwater Management Solutions
- Erosion and Abrasive Machining
- Recycling and Waste Management Techniques
- Surface Modification and Superhydrophobicity
- High Temperature Alloys and Creep
- Heat Transfer and Optimization
- Human Mobility and Location-Based Analysis
- Injection Molding Process and Properties
University of Michigan–Ann Arbor
2023-2024
University of Utah
2017-2023
Southeast University
2023
Shanghai Tunnel Engineering Rail Transit Design & Research Institute
2023
Purdue University West Lafayette
2009-2018
Tsinghua University
2007
University of Nottingham
2000
As a non-beam-based additive manufacturing (AM) method, binder jet 3D printing (BJ3DP) is process in which liquid jetted on layers of powdered materials, selectively joined, and then followed by densification process. Among AM technologies, jetting holds distinctive promise because the possibility rapid production complex structures to achieve isotropic properties printed samples. By taking advantage traditional powder metallurgy, BJ3DP machines can produce prototypes material surface finish...
Laser powder bed fusion is a dominant metal 3D printing technology. However, porosity defects remain challenge for fatigue-sensitive applications. Some associated with deep and narrow vapor depressions called keyholes, which occur under high-power, low-scan speed laser melting conditions. High-speed x-ray imaging enables operando observation of the detailed formation process pores in Ti-6Al-4V caused by critical instability at keyhole tip. We found that boundary regime power-velocity space...
Laser keyhole welding is a complicated multi-phases, multi-physics process, especially when assisting gases are involved. A three-dimensional transient model developed to investigate the dynamics of keyhole, together with vapour plume and molten pool, in self-consistent manner. The features utilization sharp interface method for accurate consideration complex surface phenomena on wall comprehensive hydrodynamic calculation both pool. validated against experiments simulation results...
In laser-based welding and additive manufacturing, the interaction of laser with metal leads to formation a cavity known as keyhole, which can fluctuate unstably during process. This work significantly advances our understanding laser-induced keyholes their dynamics, by combining state-of-the-art dynamic x-ray radiography multiphase, multiphysics modeling. Numerical simulations keyhole morphologies are validated experiment, then leveraged predict transient nonuniform distributions...
Spattering has been a problem in metal processing involving high-power lasers, like laser welding, machining, and recently, additive manufacturing. Limited by the capabilities of situ diagnostic techniques, typically imaging with visible light or laboratory x-ray sources, comprehensive understanding laser-spattering phenomenon, particularly extremely fast spatters, not achieved yet. Here, using MHz single-pulse synchrotron-x-ray imaging, we probe spattering behavior Ti-6Al-4V micrometer...
Laser keyhole welding of dissimilar metals has broad applications in various industrial fields. However, metal mixing the molten pool often causes formation detrimental intermetallic compounds that can undermine performances joints. In this study, process laser is investigated with a combination experimental and modeling approaches. The parametric study conducted to reveal effects power, speed, heat input on fusion zone. Ex-situ energy-dispersive X-ray spectroscopy element mapping used...
A numerical model is developed to investigate the three-dimensional transient dynamics of keyhole in continuous welding processes with/without assisting gas. The features utilization sharp interface method for accurate consideration complex boundary conditions on wall and a comprehensive hydrodynamic calculation both gaseous liquid phases. gives good prediction weld geometry, more importantly, provides detailed information regarding multi-phase interaction its effects dynamics. It shown that...
The interaction between high-irradiance light and molten metal is the complex multiphysics phenomenon that underpins industrial processes such as laser-based additive manufacturing, welding, cutting. One aspect requires careful attention formation evolution of vapor depressions, or keyholes, within metal. dynamic behavior these depressions can dramatically change number laser-beam reflections therefore intrinsically linked to instantaneous energy coupled into system. Despite its importance,...
The microstructure of additively manufactured (AM) metals has been shown to be heterogeneous and spatially non-uniform when compared conventionally metals. Consequently, the effective mechanical properties AM-metal parts are expected vary both within among builds. Here, we present a framework for simulating process–(micro)structure–property relationships AM produced via direct laser deposition (DLD). predicts grain nucleation competitive growth as function thermal history multi-pass,...
ConspectusAdditive Manufacturing (AM) technology produces three-dimensional components in a layer-by-layer fashion and offers numerous advantages over conventional manufacturing processes. Driven by the growing needs of diverse industrial sectors, this has seen significant advances on both scientific engineering fronts. Fusion-based processes are mainstream techniques for AM metallic materials. As metals go through melting solidification during printing processes, final microstructure hence...