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Author

Yi Denghao

Other affiliations: North University of China
Bio: Yi Denghao is an academic researcher from Beijing University of Technology. The author has contributed to research in topics: Microstructure & Ultimate tensile strength. The author has an hindex of 2, co-authored 5 publications receiving 7 citations. Previous affiliations of Yi Denghao include North University of China.

Papers
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Journal ArticleDOI
TL;DR: In this article, seven AlSi10Mg bulks with different construction angles (0°, 15°, 30°, 45°, 60°, 75°, 90°, and 90°) were fabricated by selective laser melting (SLM).

61 citations

Journal ArticleDOI
TL;DR: In this article, the effect of laser linear energy density on phase morphology, microstructure, and mechanical properties of a 10-wt% SiC-reinforced AlSi10Mg-10SiC composite is investigated.

16 citations

Journal ArticleDOI
TL;DR: In this paper, a Ni-coated graphene reinforced Inconel 625 composite was prepared by selective laser melting and the microstructure of the composite exhibited random aligned columnar dendrites due to the addition of Ni-Gr.

4 citations

Journal ArticleDOI
TL;DR: In this article, seven 316L stainless steel bulks with different angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) relative to a build substrate were built via selective laser melting (SLM).
Abstract: In this study, seven 316L stainless steel (316L SS) bulks with different angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) relative to a build substrate were built via selective laser melting (SLM). The influences of different angles on the metallography, microstructure evolution, tensile properties, and corrosion resistance of 316L SS were studied. The 0° sample showed the morphology of corrugated columnar grains, while the 90° sample exhibited equiaxed grains but with a strong texture. The 60° sample had a good strength and plasticity: the tensile strength with 708 MPa, the yield strength with 588 MPa, and the elongation with 54.51%. The dislocation strengthening and grain refinement play a vital role in the mechanical properties for different anisotropy of the SLM-fabricated 316L SS. The 90° sample had greater toughness and corrosion resistance, owing to the higher volume fraction of low-angle grain boundaries and finer grains.

1 citations

Patent
22 Mar 2019
TL;DR: In this paper, a preparation method of nickel/grapheme composite powder for rapid laser prototyping is presented, which is suitable for large-scale industrial application in the field of rapid laser manufacturing.
Abstract: The invention particularly relates to a preparation method of nickel/ graphene composite powder for rapid laser prototyping. The preparation method comprises the following steps 1, graphene is added into a dispersing agent for ultrasonic dispersion, and a graphene dispersion liquid is prepared; 2, a nickel source is dissolved in the graphene dispersion liquid obtained in the step 1 so as to obtaina solution A, imidazole organic ligand is dissolved in a solvent to obtain a solution B, the solution B is added into the solution A, and the mixture is filtered to the graphene loaded with nickel particles after leaving the mixture to stand for at least 16 hours; and 3, the graphene loaded with the nickel particles obtained in the step 2 is put into an aqueous solution, the nickel source, a reducing agent, a complexing agent and an adjusting agent are added after ultrasonic dispersion is carried out, the pH value is adjusted to 8-9 after uniformly mixing, reacting is carried out at 50-95 DEGC for at least 0.5 hour, the solid is washed after solid-liquid separation is carried out, the nickel/grapheme powder is obtained by drying, and the powder can be uniformly mixed with the nickel powder and is used for laser cladding and fusion molding of a laser selection area. According to the method, the preparation process is simple and controllable, an obtained product is excellent in performance, and the method is convenient for large-scale industrial application in the field of rapid laser prototyping.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper , the authors summarize the recent progresses on the characterization of microstructure, assessment of strengthening and damage mechanisms, evaluation of fracture and fatigue resistance, and attempts to build a primary comprehensive link between mechanical performance and micro-structure for the as built state.
Abstract: As important structural materials widely used in aerospace and automotive industries, aluminum alloys are perfect candidates for development of laser metal additive manufacturing (AM). Amongst AM aluminum alloys, laser powder bed fusion (LPBF) AlSi10Mg has received substantial attention due to its good printability and relatively low cost. Great efforts have been devoted to seek optimum process parameters that can enhance mechanical performance. However, a large scattering of material properties arises from the literature data, especially for the as built state, thus casting a shadow over further development of LPBF Al alloys. This review article aims to summarize the recent progresses on the characterization of microstructure, assessment of strengthening and damage mechanisms, evaluation of fracture and fatigue resistance, and attempts to build a primary comprehensive link between mechanical performance and microstructure for the as built state. Following the analysis of the state of the art, the review will finally provide an outlook on additional efforts needed to quantify the microstructure-property relation, based on which maximizing the potential of mechanical performance through optimizing microstructure may be achieved.

34 citations

Journal ArticleDOI
TL;DR: In this article , the authors investigated strain hardening and damage mechanisms with different build platform temperatures (35 °C and 200 °C) and loading directions (horizontal and vertical, building direction being vertical) to probe the effects of microstructure size and melt pool border orientation.
Abstract: The correlation between mechanical behavior and heterogeneous microstructure is still unclear for laser powder bed fusion AlSi10Mg. The present work investigates strain hardening and damage mechanisms with different build platform temperatures (35 °C and 200 °C) and loading directions (horizontal and vertical, building direction being vertical) to probe the effects of microstructure size and melt pool border orientation. The 35 °C microstructure involves load direction independent properties, with ductility determined by damage initiation occurring extremely close to final failure. In contrast, the 200 °C microstructure exhibits anisotropic mechanical behavior, as revealed by higher strain hardening capacity, earlier damage initiation and more dispersed damage distribution for the vertical loading direction. Although the vertical samples generally involve strain localization and crack propagation along the melt pool border, their ductility is not compromised compared to the horizontal counterparts. We attempt to explain these hardening and damage behaviors with stress partition and trade-off between phase stress and strain gradient.

15 citations

Journal ArticleDOI
TL;DR: In this paper , the surface roughness of Nylon-6 and Acrylonitrile Butadiene Styrene (ABS) was optimized using Taguchi analysis by the S/N ratio, ANOVA, and modeling methods.
Abstract: This research objective is to optimize the surface roughness of Nylon-6 (PA-6) and Acrylonitrile Butadiene Styrene (ABS) by analyzing the parametric effects of the Fused Filament Fabrication (FFF) technique of Three-Dimensional Printing (3DP) parameters. This article discusses how to optimize the surface roughness using Taguchi analysis by the S/N ratio, ANOVA, and modeling methods. The effects of ABS parameters (initial line thickness, raster width, bed temperature, build pattern, extrusion temperature, print speed, and layer thickness) and PA-6 parameters (layer thickness, print speed, extrusion temperature, and build pattern) were investigated with the average surface roughness (Ra) and root-mean-square average surface roughness (Rq) as response parameters. Validation tests revealed that Ra and Rq decreased significantly. After the optimization, the Ra-ABS and Rq-PA-6 for the fabricated optimized values were 1.75 µm and 21.37 µm, respectively. Taguchi optimization of Ra-ABS, Rq-ABS, Ra-PA-6, and Rq-PA-6 was performed to make one step forward to use them in further research and prototypes.

14 citations

Journal ArticleDOI
TL;DR: In this paper , the microstructural changes and mechanical properties of Al-Zn-Mg-Cu-Zr alloy samples with 0.05 and 0.1 wt% Sc were investigated after conventional and quench-controlled precipitation hardening treatments.

13 citations

Journal ArticleDOI
TL;DR: In this paper , the thermal expansion behavior of ZK60 magnesium alloy was investigated under different precipitation hardening and extrusion conditions, and it was revealed that the size and volume fraction of the precipitates were highly dependent on the process conditions.

11 citations