To read this content please select one of the options below:

Effect of post-processing on microstructure and mechanical properties of Alloy 718 fabricated using powder bed fusion additive manufacturing processes

Sareh Götelid (Department of Material and Process Development, Swerim AB Stockholm, Stockholm, Sweden)
Taoran Ma (Department of Manufacturing, RISE IVF AB Mölndal Sweden)
Christophe Lyphout (Department of Manufacturing, RISE IVF AB Mölndal Sweden)
Jesper Vang (Department of Material and Process Development, Swerim AB Stockholm, Stockholm, Sweden)
Emil Stålnacke (Department of Production Technology, Swerim AB Stockholm, Stockholm, Sweden)
Jonas Holmberg (Department of Manufacturing, RISE IVF AB Mölndal Sweden)
Seyed Hosseini (Department of Manufacturing, RISE IVF AB Mölndal Sweden)
Annika Strondl (Department of Material and Process Develeopment, Swerim AB Stockholm, Stockholm, Sweden)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 17 September 2021

Issue publication date: 22 October 2021

273

Abstract

Purpose

This study aims to investigate additive manufacturing of nickel-based superalloy IN718 made by powder bed fusion processes: powder bed fusion laser beam (PBF-LB) and powder bed fusion electron beam (PBF-EB).

Design/methodology/approach

This work has focused on the influence of building methods and post-fabrication processes on the final part properties, including microstructure, surface quality, residual stresses and mechanical properties.

Findings

PBF-LB produced a much smoother surface. Blasting and shot peening (SP) reduced the roughness even more but did not affect the PBF-EB surface finish as much. As-printed PBF-EB parts have low residual stresses in all directions, whereas it was much higher for PBF-LB. However, heat treatment removed the stresses and SP created compressive stresses for samples from both PBF processes. The standard Arcam process parameter for PBF-EB for IN718 is not fully optimized, which leads to porosity and inferior mechanical properties. However, impact toughness after hot isostatic pressing was surprisingly high.

Originality/value

The two processes gave different results and also responses to post-treatments, which could be of advantage or disadvantage for different applications. Suggestions for improving the properties of parts produced by each method are presented.

Keywords

Citation

Götelid, S., Ma, T., Lyphout, C., Vang, J., Stålnacke, E., Holmberg, J., Hosseini, S. and Strondl, A. (2021), "Effect of post-processing on microstructure and mechanical properties of Alloy 718 fabricated using powder bed fusion additive manufacturing processes", Rapid Prototyping Journal, Vol. 27 No. 9, pp. 1617-1632. https://doi.org/10.1108/RPJ-12-2019-0310

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

Related articles