Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

Ni, Xiaoqing; Kong, Decheng; Wen, Ying; Zhang, Liang; Wu, Wenheng; He, Beibei; Lü, Lin; Zhu, Dexiang

doi:10.1007/s12613-019-1740-x

Cited by 68 publications

(25 citation statements)

References 46 publications

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“…8,[181][182][183] In the SLMed 316L stainless steel, there were many dislocation cells inside the grain, which led to a higher hardness and strength in comparison to the wrought counterpart. 36,[184][185][186][187] Moreover, nanoscale inclusions (diameter ranging from 100 to 200 nm) were extensive in the SLMed 316L substrate and were enriched with Si, Al, Mn and O as displayed in Fig. 10b, c, which was also confirmed by other reports.…”

Section: Al-based Alloyssupporting

confidence: 87%

“…3d, e, which should be attributed to the large interfacial stress and micro-voids at the MPBs. 92,93 Surface roughness The surface roughness of the parts fabricated by SLM is usually higher (range from 10 μm to 30 μm) than that in parts manufactured by other methods, such as milling (~1 μm). 94 There are two main reasons for the rough surface in the SLM process, one is caused by evaporation and the Marangoni force existed during the powder melting.…”

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

“…3 a Scanning electron morphology of the MPBs in a SLMed sample, 53 cross-sectional corroded morphologies of b wrought and c SLMed AlSi10Mg alloy in NaCl solution, 206 surface corroded morphologies of d wrought and e SLMed 316L stainless steel in ferric chloride solution. 92 (a adapted with permission from ref. 53 , copyright Elsevier 2014) (b and c adapted with permission from ref.…”

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

“…206 , copyright Elsevier 2016) (d and e adapted with permission from ref. 92 , copyright Springer 2019) roughness of stainless steels. A similar trend has also been reported for other metals, such as copper [111][112][113] and magnesium alloys.…”

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

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Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

186

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Additive manufacturing is an emerging technology that challenges traditional manufacturing methods. However, the corrosion behaviour of additively manufactured parts must be considered if additive techniques are to find widespread application. In this paper, we review relationships between the unique microstructures and the corresponding corrosion behaviour of several metallic alloys fabricated by selective laser melting, one of the most popular powder-bed additive technologies for metals and alloys. Common issues related to corrosion in selective laser melted parts, such as pores, molten pool boundaries, surface roughness and anisotropy, are discussed. Widely printed alloys, including Ti-based, Al-based and Fe-based alloys, are selected to illustrate these relationships, and the corrosion properties of alloys produced by selective laser melting are summarised and compared to their conventionally processed counterparts.

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Section: Al-based Alloyssupporting

confidence: 87%

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

Section: Molten Pool Boundaries (Mpbs)mentioning

confidence: 99%

See 2 more Smart Citations

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

186

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“…Depending on the G/R ratio, the dendrites are either columnar or equiaxed/cellular [12][13]. The dendritic structure coincides with a high dislocation density at the cell boundaries [14][15][16][17]. Thus, the as-built condition is strengthened by the high dislocation density and the fine microstructure, which leads to the dislocation and Hall-Petch hardening mechanism [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the heat treatment of additively manufactured Ni-base superalloy IN718

Diepold

Vorlaufer

Neumeier

et al. 2020

Int J Miner Metall Mater

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Additive manufacturing (AM) of Ni-base superalloy components can lead to a significant reduction of weight in aerospace applications. AM of IN718 by selective laser melting results in a very fine dendritic microstructure with a high dislocation density due to the fast solidification process. The complex phase composition of this alloy, with three different types of precipitates and high residual stresses, necessitates adjustment of the conventional heat treatment for AM parts. To find an optimized heat treatment, the microstructures and mechanical properties of differently solution heat-treated samples were investigated by transmission and scanning electron microscopy, including electron backscatter diffraction, and compression tests. After a solution heat treatment (SHT), the Nb-rich Laves phase dissolves and the dislocation density is reduced, which eliminates the dendritic substructure. SHT at 930 or 954°C leads to the precipitation of the δ-phase, which reduces the volume fraction of the strengthening γ′-and γ′′-phases formed during the subsequent two stage aging treatment. With a higher SHT temperature of 1000°C, where no δ-phase is precipitated, higher γ′ and γ′′ volume fractions are achieved, which results in the optimum strength of all of the solution heat treated conditions.

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Mechanical characterization and properties of laser-based powder bed–fused lattice structures: a review

Riva

Ginestra

Ceretti

2021

Int J Adv Manuf Technol

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The increasing demand for a wider access to additive manufacturing technologies is driving the production of metal lattice structure with powder bed fusion techniques, especially laser-based powder bed fusion. Lattice structures are porous structures formed by a controlled repetition in space of a designed base unit cell. The tailored porosity, the low weight, and the tunable mechanical properties make the lattice structures suitable for applications in fields like aerospace, automotive, and biomedicine. Due to their wide-spectrum applications, the mechanical characterization of lattice structures is mostly carried out under compression tests, but recently, tensile, bending, and fatigue tests have been carried out demonstrating the increasing interest in these structures developed by academy and industry. Although their physical and mechanical properties have been extensively studied in recent years, there still are no specific standards for their characterization. In the absence of definite standards, this work aims to collect the parameters used by recent researches for the mechanical characterization of metal lattice structures. By doing so, it provides a comparison guide within tests already carried out, allowing the choice of optimal parameters to researchers before testing lattice samples. For every mechanical test, a detailed review of the process design, test parameters, and output is given, suggesting that a specific standard would enhance the collaboration between all the stakeholders and enable an acceleration of the translation process.

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Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

Cited by 68 publications

References 46 publications

Corrosion of metallic materials fabricated by selective laser melting

Corrosion of metallic materials fabricated by selective laser melting

Optimization of the heat treatment of additively manufactured Ni-base superalloy IN718

Mechanical characterization and properties of laser-based powder bed–fused lattice structures: a review

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