Surface finishing techniques for SLM manufactured stainless steel 316L components

Morton, Wayne; Green, Sarah; Rennie, Allan; Abram, Thomas

doi:10.1201/b11341-82

Cited by 8 publications

(3 citation statements)

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“…Apart from the time to build, the major disadvantage of the process is the roughness of the surface finish produced which is of a size order dependent on the powder particle size used. This can be improved by a surface remelting process as shown by Yasa et al [12] or also by mechanical finishing methods [13]. No tooling or jigging is needed to fabricate the part, but dependent on exact build configuration and geometry, support structures may be required that may also act as anchors for components on the build platen.…”

Section: Selective Laser Melting (Slm)mentioning

confidence: 98%

An investigation into the use of additive manufacture for the production of metallic bipolar plates for polymer electrolyte fuel cell stacks

et al. 2015

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The bipolar plate is of critical importance to the efficient and long lasting operation of a polymer electrolyte fuel cell (PEMFC) stack. With advances in membrane electrode assembly design, greater attention has been focused on the bipolar plate and the important role it plays. Although carbon composite plates are a likely candidate for the mass introduction of fuel cells, it is metallic plates made from thin strip materials which could deliver significant advantages in terms of part cost, electrical performance and size. However, there are some disadvantages. Firstly, interfacial stability of the metal interconnect is difficult to achieve. Secondly, and the issue addressed here, is the difficultly and cost in developing new plate designs when there are very significant tooling costs associated with manufacture. The use of selective laser melting (SLM: an additive manufacturing technique) was explored to produce metallic bipolar plates for PEMFC as a route to inexpensively test several plate designs without committing to tooling. Crucial to this was proving that, electrically, bipolar plates fabricated by SLM behave similarly to those produced by conventional manufacturing techniques. This research presents the development of a small stack to compare the short term performance of metallic plates made by machining against those made by SLM. Experimental results demonstrate that the cell performance in this case was unaffected by the manufacturing method used and it is therefore concluded that additive manufacturing could be a very useful tool to aid the rapid development of metallic bipolar plate designs.

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Section: Selective Laser Melting (Slm)mentioning

confidence: 98%

An investigation into the use of additive manufacture for the production of metallic bipolar plates for polymer electrolyte fuel cell stacks

et al. 2015

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“…130) These techniques create GS materials, i.e., they are HSMs and do not require any posterior heat-treatments. Several GS materials have been developed by surface nanostructuring techniques like peening-based processes, [131][132][133][134][135][136][137][138][139][140][141][142][143] surface mechanical attrition treatment (SMAT), blasting, [172][173][174][175][176][177][178][179][180] ultrasonic surface deformation-based processes, 132,140,142,[181][182][183][184][185][186][187][188][189][190][191][192][193][194][195][196][197][198] and surface mechanical rolling treatment. [199][200][201] From all the above, the most widely reported are SMAT and shot peen...…”

Section: Surface Nanostructuringmentioning

confidence: 99%

Heterostructured Materials by Severe Plastic Deformation: Overview and Perspectives

Romero-Resendiz,

Naeem,

Zhu

2023

Mater. Trans.

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Heterostructured materials (HSMs) constitute heterogeneously distributed soft and hard zones with a mismatch in mechanical or physical properties of at least 100% between them. A synergistic effect resulting from the interactive coupling between the heterogeneous zones surpasses the properties predicted by the rule of mixtures. Therefore, the mechanical or physical properties of HSMs are not achievable by their homogeneous counterparts. HSM production commonly requires plastic deformation to refine the microstructure and subsequent partial recrystallization heat-treatments to obtain heterogeneous distributions of grain size, texture, or defect density. Other routes are by applying surface plastic deformation or by stacking layers with a high property mismatch between them. All of those routes can be achieved by severe plastic deformation (SPD) techniques. This overview focuses on describing the fundamentals of HSMs produced by SPD. A critical description of the physics of SPD and HSMs, as well as the factors influencing their microstructural evolution, perspectives, and outstanding issues, are included. A critical comparison of the strength-ductility relationship in HSMs produced by different SPD techniques is also included to guide upcoming research. This overview is intended to serve as a basis for understanding and designing future HSMs produced by SPD.

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“…For this purpose, several mechanical processes can be applied, among which the wire electrical discharge machining (Wire EDM) stands out. In addition, with the aim to improve various quality aspects of the parts (Lesyk et al, 2020), other mechanical post-processes can be applied, such as dry mechanical-electromechanical (Bai et al, 2020), tumbling finishing (Morton et al, 2012), ultrasonic excitation (Tilita et al, 2017), surface rolling (Wang et al, 2017), both external (Avanzini et al, 2019) and internal (Han et al, 2020) abrasive processes, laser polishing (Basha et al, 2020) and different peening processes as laser peening (Hackel et al, 2018), ultrasonic peening (Gale and Achuhan, 2017), shot-peening (AlMangour and Yang, 2016). Overall, this improvement is aimed at achieving a better surface finish not attainable in the as-built state.…”

Section: Introductionmentioning

confidence: 99%

Analysis of post-processing influence on the geometrical and dimensional accuracy of selective laser melting parts

Cuesta

Álvarez

Zapico

et al. 2020

RPJ

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Purpose This study aims to analyze the effect of the different common post-processes on the geometrical and dimensional accuracy of selective laser melting (SLM) parts. Design/methodology/approach An artefact has been designed including cubic features formed by planar surfaces orientated according to the machine axes, covering all the X-Y area of the working space. The artefact has been analyzed both geometrically (flatness, parallelism) and dimensionally (sizes, distances) from coordinate measuring machine measurement results at three stages, namely, as-built, after sand-blasting and after stress-relieving heat treatment. Findings Results from the SLM machine used in this study lead to smaller parts than the nominal ones. This effect depends on the direction of the evaluated dimension of the parts, i.e. X, Y or Z direction and is differently affected by the sandblasting post-process (average erosion ratio of 68, 54 and 9 µm, respectively), being practically unaltered by the HT applied after. Originality/value This paper shows the influence, from a geometric and dimensional point of view, of two of the most common post-processes used after producing SLM parts, such as sand-blasting and stress-relieving heat treatment, that have not been considered in previous research.

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Surface finishing techniques for SLM manufactured stainless steel 316L components

Cited by 8 publications

References 0 publications

An investigation into the use of additive manufacture for the production of metallic bipolar plates for polymer electrolyte fuel cell stacks

An investigation into the use of additive manufacture for the production of metallic bipolar plates for polymer electrolyte fuel cell stacks

Heterostructured Materials by Severe Plastic Deformation: Overview and Perspectives

Analysis of post-processing influence on the geometrical and dimensional accuracy of selective laser melting parts

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