Thermal stability and microstructural evolution of additively manufactured 316L stainless steel by laser powder bed fusion at 500–800 ℃

Yin, Houshang; Song, Miao; Deng, Pu; Li, Lin; Prorok, Barton C.; Lou, Xiaoyuan

doi:10.1016/j.addma.2021.101981

Cited by 23 publications

(18 citation statements)

References 48 publications

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“…On the basis of available AM literature, Fayazfar et al [10] reviewed powder-based additive technologies for the processing of steels and showed that the vast body of research has concentrated on the laser powder bed (LPB) processing of austenitic 316LSS [11][12][13][14]. The review by Baja et al [11] on the microstructure and properties of steels processed by AM covered the research and challenges over the last decade to develop process windows for 316LSS using LPB technologies.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking of 316L Stainless Steel Manufactured by a Hybrid Additive/Subtractive Technology

Sarafan

Wanjara

Gholipour

et al. 2022

JMMP

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This research study investigated the hybrid processing of 316L stainless steel using laser powder bed (LPB) processing with high-speed machining in the same build envelope. Benchmarking at four laser powers (160 W, 240 W, 320 W, and 380 W) was undertaken by building additively with machining passes integrated sequentially after every ten deposited layers, followed by the final finishing of select surfaces. The final geometry was inspected against the computer-aided design (CAD) model and showed deviations smaller than 280 µm for the as-built and machined surfaces, which demonstrate the good efficacy of hybrid processing for the net-shape manufacturing of stainless steel products. The arithmetic average roughness values for the printed surfaces, Ra (linear) and Sa (surface), were 11.4 um and 14.9 um, respectively. On the other hand, the vertical and horizontal machined surfaces had considerably lower roughness, with Ra and Sa values ranging between 0.33 µm and 0.70 µm. The 160 W coupon contained layered, interconnected lack of fusion defects which affected the density (7.84 g·cm−3), yield strength (494 MPa), ultimate tensile strength (604 MPa), Young’s modulus (175 GPa), and elongation at break (17.3%). By contrast, at higher laser powers, near-full density was obtained for the 240 W (7.96 g·cm−3), 320 W (7.94 g·cm−3), and 380 W (7.92 g·cm−3) conditions. This, combined with the isolated nature of the small pores, led to the tensile properties surpassing the requirements stipulated in ASTM F3184—16 for 316L stainless steel.

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Section: Introductionmentioning

confidence: 99%

Benchmarking of 316L Stainless Steel Manufactured by a Hybrid Additive/Subtractive Technology

Sarafan

Wanjara

Gholipour

et al. 2022

JMMP

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show abstract

“…It is worth mentioning that cellular structure associated with chemical segregation at cellular boundary was widely observed in laser-assisted manufacturing and processing processes [ 98 , 99 , 100 ]. With the “right” chemical segregation, the amorphous shell can form [ 100 , 101 ].…”

Section: Characteristic Microstructuresmentioning

confidence: 99%

Crystalline–Amorphous Nanostructures: Microstructure, Property and Modelling

et al. 2023

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Crystalline metals generally exhibit good deformability but low strength and poor irradiation tolerance. Amorphous materials in general display poor deformability but high strength and good irradiation tolerance. Interestingly, refining characteristic size can enhance the flow strength of crystalline metals and the deformability of amorphous materials. Thus, crystalline–amorphous nanostructures can exhibit an enhanced strength and an improved plastic flow stability. In addition, high-density interfaces can trap radiation-induced defects and accommodate free volume fluctuation. In this article, we review crystalline–amorphous nanocomposites with characteristic microstructures including nanolaminates, core–shell microstructures, and crystalline/amorphous-based dual-phase nanocomposites. The focus is put on synthesis of characteristic microstructures, deformation behaviors, and multiscale materials modelling.

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“…6d, the proportion of low angle grain boundaries (LAGBs, <15 ) was measured to be 68.2% in the as-LPBFed alloy. The LAGBs might play a role in facilitating the local nucleation and the growth of precipitated phases [41], resulting in the enhancement in strength. In Fig.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructure and mechanical properties of pseudo binary eutectic Al–Mg2Si alloy processed by laser powder bed fusion

Yang¹,

Wen²,

Ai³

et al. 2023

Journal of Materials Research and Technology

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Thermal stability and microstructural evolution of additively manufactured 316L stainless steel by laser powder bed fusion at 500–800 ℃

Cited by 23 publications

References 48 publications

Benchmarking of 316L Stainless Steel Manufactured by a Hybrid Additive/Subtractive Technology

Benchmarking of 316L Stainless Steel Manufactured by a Hybrid Additive/Subtractive Technology

Crystalline–Amorphous Nanostructures: Microstructure, Property and Modelling

Microstructure and mechanical properties of pseudo binary eutectic Al–Mg2Si alloy processed by laser powder bed fusion

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