Crystallographic-orientation-dependent tensile behaviours of stainless steel 316L fabricated by laser powder bed fusion

Wang, Xianglong; Muñiz-Lerma, José Alberto; Shandiz, M. Attarian; Sánchez-Mata, Oscar; Brochu, Mathieu

doi:10.1016/j.msea.2019.138395

Cited by 136 publications

(52 citation statements)

References 83 publications

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“…This is why the tensile properties of the samples along the X-axis are better than those along the Z-axis shown in Figure 11. Similar phenomenon was also found by Wang et al 32 and Hitzler et al 33 The grains in Figure 12(b) show a strengthening of the red (001) orientation and a weakening of the green (101) and blue (111) orientations. It is well known that GH536 has a face-centered cubic (FCC) crystal structure with a preferred growth direction of (001).…”

Section: Resultssupporting

confidence: 87%

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Ren

Lü

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser powder bed fusion additive manufacturing of superalloys has received increasing attention in these years. In this article, the influence of parameters of laser powder bed fusion on mechanical properties and microstructures of nickel-based superalloy GH536 was investigated. Influence of laser power, scanning speed, hatch space and building direction on mechanical properties was discussed, and the optimal parameters were obtained. The relative density of samples fabricated by laser powder bed fusion could be as high as 99.5%. The processing window of laser energy density with 8.56 × 104–1.15 × 105 J/cm3 should be employed to make sure that the relative density is higher than 98%. The ultimate tensile strength and yield stress of GH536 sample made by laser powder bed fusion were 950 and 606 MPa, respectively, which were superior to samples with the tensile strength of 767 MPa and yield strength of 379 MPa prepared by traditional hot forging method. The hardness of the sample could reach 316.8 HV.

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Section: Resultssupporting

confidence: 87%

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Ren

Lü

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…It is well established that the thermal gradient along the melt pool walls during the solidification influences the grain orientation. 33,34 Sun et al 35 reported that an increase in the heat input, resulting in lower thermal gradient and lower cooling rate, can change the grain orientation of LB-PBF 316L from <001> to <110>, similar to the results obtained for P150 condition in this study. Therefore, preheating the build platform resembles the condition where the process parameters are attuned to obtain a higher heat input for reaching a lower cooling/solidification rate during AM processes.…”

Section: Microstructure Characterizationsupporting

confidence: 87%

“…In addition, grains are oriented along the direction of the easy slip system for FCC structure in P150 condition; thus, dislocations can cross slip and glide easier, which could have also assisted with the increased ductility and elongation in P150 specimens. Similarly, Wang et al 33 reported an increase in ductility of LB-PBF 316L SS as a result of containing oriented grains as compared with the condition with <100>oriented grains, whereas the yield strength remained unchanged.…”

Section: Quasi-static Tensile Behaviourmentioning

confidence: 79%

Enhancing ductility and fatigue strength of additively manufactured metallic materials by preheating the build platform

Nezhadfar

Phan

2020

Fatigue Fract Eng Mat Struct

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The effect of preheating the build platform (process) on the microstructure/ defect structure (structure) as well as the tensile and fatigue behaviour (property) of the laser beam powder bed fused (LB-PBF) 316L stainless steel (SS) is investigated. Preheating the build platform to 150 C (P150) affects the thermal gradient and cooling rate resulting in the reduction of the volumetric defects (i.e., gas-entrapped pores and lack of fusion (LoF)) as compared with the condition where the build platform is non-preheated (NP). The ductility of P150 LB-PBF 316L SS is improved as compared with the NP counterpart, resulting from the less volumetric defects as well as the change in the crystallographic orientation of the grains in P150 condition. In addition, preheating the build platform is found to enhance the fatigue resistance of LB-PBF 316L SS specimens. This is associated with fewer and smaller volumetric defects in P150 specimens as compared with the NP ones.

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“…There are many reports on the SLM fabrication of 316L SS; 22) however, to the best of the authors' knowledge, there are no reports of the creation of distinguished different textures. We have realized crystallographic texture control over a wide range: a single crystalline-like texture with {001} orientation in the build direction, that with {011} orientation in the build direction, 13) a CLM texture in which two kinds of grains with different orientations were alternately stacked in a periodicity of 80 μm, and polycrystalline.…”

Section: Resultsmentioning

confidence: 99%

Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

Ishimoto

Ito

et al. 2020

ISIJ Int.

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Crystallographic-orientation-dependent tensile behaviours of stainless steel 316L fabricated by laser powder bed fusion

Cited by 136 publications

References 83 publications

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Enhancing ductility and fatigue strength of additively manufactured metallic materials by preheating the build platform

Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

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