Development of porous 316L stainless steel with controllable microcellular features using selective laser melting

Shen, Yi; Gu, Dongdong; Wu, Pengyue

doi:10.1179/174328408x287691

Cited by 61 publications

(23 citation statements)

References 26 publications

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“…Moreover, SLM technology is flexible in controlling porosities according to different laser energy inputs ( , showing a great potential for producing porous materials. Fortunately, Gu et al have studied fabrication of porous metal using direct laser forming technology ( Ref 12,13). Moreover, they pointed out that the porosity of SLM-produced parts can be easily controlled by processing parameters.…”

Section: Introductionmentioning

confidence: 98%

316L Stainless Steel with Gradient Porosity Fabricated by Selective Laser Melting

Liu

Shi

et al. 2009

J. of Materi Eng and Perform

201

107

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To fabricate 316L stainless steel part with a pore gradient structure, the method using selective laser melting (SLM) technique is exploited. Scan tracks feature, densification, and tensile property of SLMproduced samples prepared via different scan speeds were investigated. The results show that the porosity is strongly influenced by scan speed. On this basis, a gradient changed scan speed was applied in every SLM layer for the purpose of producing a gradient porosity metal. The results indicate that the structure exhibits a gradually increased porosity and a reduced molten pool size along the gradient direction of scan speed variation. The forming mechanisms for the gradient porosity were also addressed.

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Section: Introductionmentioning

confidence: 98%

316L Stainless Steel with Gradient Porosity Fabricated by Selective Laser Melting

Liu

Shi

et al. 2009

J. of Materi Eng and Perform

201

107

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“…Selective laser melting (SLM) is a type of promising metal additive manufacturing (AM) technology, in which functional complex parts can be formed into arbitrary shapes by melting layers of powder particle selectively and successively without traditional processing [ 1 , 2 , 3 ]. SLM has a new potential development of the most innovate laser manufacturing technology, which has been widely used in aerospace, medicine, and automotive fields because of generated metal parts with fine surface roughness, high relative density, high mechanical properties, and even arbitrary complex structures [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

et al. 2017

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Selective laser melting (SLM) is a potential additive manufacturing (AM) technology. However, the application of SLM was confined due to low efficiency. To improve efficiency, SLM fabrication with a high layer thickness and fine powder was systematically researched, and the void areas and hollow powders can be reduced by using fine powder. Single-track experiments were used to narrow down process parameter windows. Multi-layer fabrication relative density can be reached 99.99% at the exposure time-point distance-hatch space of 120 µs-40 µm-240 µm. Also, the building rate can be up to 12 mm 3 /s, which is about 3-10 times higher than the previous studies. Three typical defects were found by studying deeply, including the un-melted defect between the molten pools, the micro-pore defect within the molten pool, and the irregular distribution of the splashing phenomenon. Moreover, the microstructure is mostly equiaxed crystals and a small amount of columnar crystals. The averages of ultimate tensile strength, yield strength, and elongation are 625 MPa, 525 MPa, and 39.9%, respectively. As exposure time increased from 80 µs to 200 µs, the grain size is gradually grown up from 0.98 µm to 2.23 µm, the grain aspect ratio is close to 1, and the tensile properties are shown as a downward trend. The tensile properties of high layer thickness fabricated are not significantly different than those with a coarse-powder layer thickness of low in previous research.

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“…If the laser power density is too low during laser melting formation in the selected area, the powder layer may not melt completely or penetrate the pre-cured layer, resulting in degraded performance of the formed portion. If the laser power density is too high, a laser-shielding plasma is generated, which hinders absorption of energy by the metal powder and reduces the performance of the molded parts [23][24][25].…”

Section: Results and Analysismentioning

confidence: 99%

The effect of laser power and scanning speed on forming structure in selective laser melting process

Han

Zhang

et al. 2022

Mater. Res. Express

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With the continuous development of ship technology, the usage environment of some parts has changed, with higher requirements for materials and preparation technology being put forward. Some traditional structural materials have do not meet the actual working conditions of ships, which necessitates development of new materials and research on their preparation technology. Owing to its high strength and stable mechanical properties at high temperature, molybdenum base alloy is expected to replace nickel base alloy and aluminum base alloy the primary structural material in the development of ships. Under the conventional method, the impurity elements is quite complex and there are limitations in the shape of the formed parts. This experiment uses spherical pure molybdenum powder as raw material. The effects of laser power, powder thickness, scanning speed and scanning distance on the microstructure of formed parts during selective laser melting process were studied and the optimum process parameters were determined. Laser power and scanning speed can seriously affect the quality of the forming parts. In this experiment, by comparing the density and internal holes of the forming parts under different process parameters, the best preparation process for the forming parts was determined: laser power 325 watts, scanning speed 400mm/s, powder thickness 30μm, scanning distance 40μm. Meanwhile, the forming workpiece density is the largest, up to 94.92%.

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Development of porous 316L stainless steel with controllable microcellular features using selective laser melting

Cited by 61 publications

References 26 publications

316L Stainless Steel with Gradient Porosity Fabricated by Selective Laser Melting

316L Stainless Steel with Gradient Porosity Fabricated by Selective Laser Melting

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

The effect of laser power and scanning speed on forming structure in selective laser melting process

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