Effect of scanning strategies on the microstructure and mechanical behavior of 316L stainless steel fabricated by selective laser melting

Song, Yanan; Sun, Qidong; Guo, Kai; Wang, Xiebin; Liu, Jiangwei; Sun, Jie

doi:10.1016/j.msea.2020.139879

Cited by 65 publications

(18 citation statements)

References 26 publications

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“…Selective laser melting (SLM) technology is a kind of additive manufacturing technology with great development potential. Based on the discrete-stack principle, this technology uses the laser beam as a heat source under the control of a galvanometer, and is guided by computer-aided design data to melt the selective area of metal powder layer by layer, so that the metal powder accumulates into a solid [1,2]. Recent studies have shown that the SLM process exhibits good mechanical properties due to its rapid cooling and unique multi-scale (from nano to macro scale) heterogeneous structure [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Fatigue Damage of 316L Stainless Steel Manufactured by Selective Laser Melting (SLM)

et al. 2021

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In this paper, 316L stainless steel powder was processed and formed by selective laser melting (SLM). The microstructure of the sample was studied using an optical microscope, and the fatigue failure of the sample and the characteristics of crack initiation and propagation were analyzed, providing a research basis for the application of SLM-316L. Due to the influence of microstructure and SLM process defects, the fatigue cracks of SLM-316L mainly emerged due to defects such as lack of fusion and pores, while the cracks of rolled 316L initiated at the inclusions near the surface of the specimen. After fatigue microcrack initiation of the SLM-316L specimen, due to the existence of shear stress and tear stress, the crack tip was passivated and Z-shaped propagation was formed. The existence of internal defects in SLM-316L made the microcrack initiation random and diverse. At the same time, the existence of defects affected the crack propagation in the form of bending, bifurcation and bridge, which made the main crack propagation deviate from the maximum load direction.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Fatigue Damage of 316L Stainless Steel Manufactured by Selective Laser Melting (SLM)

et al. 2021

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“…The 45° and 60° samples exhibited the maximum tensile strengths of 701 and 708 MPa, respectively. This tensile strength was significantly better than the SLM-formed 316L SS of Song Y.n. et al (2020) and Chao et al (2021) .…”

Section: Resultsmentioning

confidence: 77%

“…In order to alleviate this, some researchers have decreased defects in the SLM-processed 316L SS, such as cracks and pores, by optimizing the process parameters ( Liverani et al, 2017 ). Several studies have changed the laser-scanning strategy and increased the preheating temperature to improve the residual stress level and the microstructure anisotropy within the SLM-fabricated 316L SS ( Song Y.n. et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanism of Structure Angle on Microstructure and Properties of SLM-Fabricated 316L Stainless Steel

et al. 2021

Front. Bioeng. Biotechnol.

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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 <101> 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.

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“…9 Notable progress in manufacturing processes and experimental analysis based on strength parameters have been achieved for AM components. There are recently a flood of publications on L-PBF 316L in terms of many aspects: corrosion, [10][11][12][13][14] fatigue, [15][16][17][18] microstructure, [19][20][21][22][23][24][25] mechanical strength, [26][27][28][29][30] tribology, [31][32][33] and so on. On the one hand, existing researches indicate that this material shows a lot of differences compared to the conventionally fabricated ones; on the other hand, efforts are still required to better reveal the properties and performances as they are highly connected to the fabrication process.…”

Section: Introductionmentioning

confidence: 99%

Correlation between microstructure and cyclic behavior of 316L stainless steel obtained by Laser Powder Bed Fusion

Liang

Hor

Robert

et al. 2022

Fatigue Fract Eng Mat Struct

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In this work, stainless steel 316L obtained by Laser Powder Bed Fusion (L-PBF) has been produced and characterized. The experimental campaign focuses on the samples in the as-built state under cyclic tension-compression loadings. Low cycle fatigue (LCF) and high cycle fatigue (HCF) tests are carried out. Microstructure observations are performed before and after the loadings. As-built L-PBF 316L has a good LCF performance despite the presence of surface defects but a low fatigue limit in the HCF regime. Removing the surface roughness has a beneficial effect but does not improve the fatigue strength to that of machined wrought 316L. Observations on the microstructure of fatigue samples indicate that LCF is dominated by the local plastic deformation, which is mostly achieved by the slip in the studied material and is not sensitive to the defect. The lack-of-fusion defect impairs the fatigue resistance in the HCF regime.

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Effect of scanning strategies on the microstructure and mechanical behavior of 316L stainless steel fabricated by selective laser melting

Cited by 65 publications

References 26 publications

Microstructure and Fatigue Damage of 316L Stainless Steel Manufactured by Selective Laser Melting (SLM)

Microstructure and Fatigue Damage of 316L Stainless Steel Manufactured by Selective Laser Melting (SLM)

Study on Mechanism of Structure Angle on Microstructure and Properties of SLM-Fabricated 316L Stainless Steel

Correlation between microstructure and cyclic behavior of 316L stainless steel obtained by Laser Powder Bed Fusion

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