Author
Ming Gao
Other affiliations: Jiangsu University, University of Science and Technology of China, Osaka University ...read more
Bio: Ming Gao is an academic researcher from Huazhong University of Science and Technology. The author has contributed to research in topics: Welding & Ultimate tensile strength. The author has an hindex of 32, co-authored 117 publications receiving 3841 citations. Previous affiliations of Ming Gao include Jiangsu University & University of Science and Technology of China.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the starting material, manufacturing processes, heat treatment and characterization procedures of mechanical properties are presented, and the microstructure is crucial for the mechanical properties of IN718.
602 citations
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TL;DR: In this article, the morphology and substructure of α′ martensite in Ti-6Al-4V cuboid samples produced by selective laser melting (SLM) have been investigated to explore the formation mechanism and control method.
527 citations
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TL;DR: In this paper, the effects of slice thickness, overlap rate, building direction and hatch angle on tensile properties of SLMed 304 stainless steel samples are investigated, and it is found that the tensile strength and ductility of the SLMed samples at proper parameters are higher than those of the wrought 304 steel.
324 citations
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TL;DR: In this article, the microstructure and mechanical properties of 304 stainless steel joints by tungsten inert gas (TIG) welding, laser welding and laser-TIG hybrid welding were investigated.
279 citations
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12 Aug 2014-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the relative density, microstructure, microhardness and tensile properties of the deposited AZ91D samples at different laser energy inputs were characterized, and the results indicate that laser energy input plays a significant role in determining formation qualities of the SLMed samples.
Abstract: Selective laser melting (SLM) technology has been used to manufacture the AZ91D magnesium alloy. The relative density, microstructure, microhardness and tensile properties of the deposited AZ91D samples at different laser energy inputs were characterized. The results indicate that laser energy input plays a significant role in determining formation qualities of the SLMed samples. High density samples without obvious macro-defects can be obtained between 83 J/mm 3 and 167 J/mm 3 . The SLMed AZ91D presents a unique layerwise feature in which the fully divorced eutectic β-Mg 17 Al 12 distributing along the boundary of the equiaxed α-Mg matrix. The average size of α-Mg in overlapping regions is a little larger than that in the center of the scanning tracks due to the remelting process though the element distributions of Mg and Al are quite uniform. The microhardness of all samples shows directional independence. The microhardness and tensile strengths of the SLMed AZ91D at room temperature are superior to those of the die-cast AZ91D due to the combined effect of grain refinement and solid solution strengthening.
238 citations
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TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
4,192 citations
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TL;DR: In this paper, the authors describe the complex relationship between additive manufacturing processes, microstructure and resulting properties for metals, and typical microstructures for additively manufactured steel, aluminium and titanium are presented.
2,837 citations
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TL;DR: In this article, a review of additive manufacturing (AM) techniques for producing metal parts are explored, with a focus on the science of metal AM: processing defects, heat transfer, solidification, solid-state precipitation, mechanical properties and post-processing metallurgy.
Abstract: Additive manufacturing (AM), widely known as 3D printing, is a method of manufacturing that forms parts from powder, wire or sheets in a process that proceeds layer by layer. Many techniques (using many different names) have been developed to accomplish this via melting or solid-state joining. In this review, these techniques for producing metal parts are explored, with a focus on the science of metal AM: processing defects, heat transfer, solidification, solid-state precipitation, mechanical properties and post-processing metallurgy. The various metal AM techniques are compared, with analysis of the strengths and limitations of each. Only a few alloys have been developed for commercial production, but recent efforts are presented as a path for the ongoing development of new materials for AM processes.
1,713 citations
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12 Mar 2014
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Abstract: In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).
1,539 citations
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TL;DR: Selective laser melting (SLM) is a particular rapid prototyping, 3D printing, or additive manufacturing (AM) technique designed to use high power-density laser to melt and fuse metallic powders as mentioned in this paper.
Abstract: Selective Laser Melting (SLM) is a particular rapid prototyping, 3D printing, or Additive Manufacturing (AM) technique designed to use high power-density laser to melt and fuse metallic powders. A component is built by selectively melting and fusing powders within and between layers. The SLM technique is also commonly known as direct selective laser sintering, LaserCusing, and direct metal laser sintering, and this technique has been proven to produce near net-shape parts up to 99.9% relative density. This enables the process to build near full density functional parts and has viable economic benefits. Recent developments of fibre optics and high-power laser have also enabled SLM to process different metallic materials, such as copper, aluminium, and tungsten. Similarly, this has also opened up research opportunities in SLM of ceramic and composite materials. The review presents the SLM process and some of the common physical phenomena associated with this AM technology. It then focuses on the following a...
1,455 citations