Stress corrosion cracking performance of LPBF-built 316L stainless steel post-processed with heat treatment and severe shot peening
Gundgire, Tejas; Santa-aho, Suvi; Rautio, Timo; Vippola, Minnamari (2024-09-21)
Taylor & Francis
21.09.2024
Gundgire, T., Santa-aho, S., Rautio, T., & Vippola, M. (2024). Stress corrosion cracking performance of LPBF-built 316L stainless steel post-processed with heat treatment and severe shot peening. Virtual and Physical Prototyping, 19(1). https://doi.org/10.1080/17452759.2024.2406414.
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202409306111
https://urn.fi/URN:NBN:fi:oulu-202409306111
Tiivistelmä
Abstract
This study investigated stress corrosion cracking (SCC) susceptibility in laser powder bed fusion (LPBF) printed 316L stainless steel under corrosive conditions. LPBF process inherently introduces residual stresses and surface defects that can compromise material integrity in aggressive environments. Post-processing techniques, specifically severe shot peening (SSP), heat treatments at 600°C and 900°C, and their combinations were employed to mitigate these issues. SCC testing in a boiling 25% NaCl solution assessed cracking over a period of five weeks. The results demonstrate that while SSP initially introduced compressive residual stresses potentially enhancing SCC resistance, subsequent mechanical deformation by U-bending diminished these benefits, leading to increased susceptibility to cracking. Tensile stresses induced by U-bending appeared to override the benefits of defect closure and reduced surface roughness, resulting in cracking. Notably, only specimens subjected to AB + SSP and HT600 + SSP conditions exhibited cracking during the testing period, highlighting the complex interplay between residual stresses, mechanical deformation, and SCC behaviour.
This study investigated stress corrosion cracking (SCC) susceptibility in laser powder bed fusion (LPBF) printed 316L stainless steel under corrosive conditions. LPBF process inherently introduces residual stresses and surface defects that can compromise material integrity in aggressive environments. Post-processing techniques, specifically severe shot peening (SSP), heat treatments at 600°C and 900°C, and their combinations were employed to mitigate these issues. SCC testing in a boiling 25% NaCl solution assessed cracking over a period of five weeks. The results demonstrate that while SSP initially introduced compressive residual stresses potentially enhancing SCC resistance, subsequent mechanical deformation by U-bending diminished these benefits, leading to increased susceptibility to cracking. Tensile stresses induced by U-bending appeared to override the benefits of defect closure and reduced surface roughness, resulting in cracking. Notably, only specimens subjected to AB + SSP and HT600 + SSP conditions exhibited cracking during the testing period, highlighting the complex interplay between residual stresses, mechanical deformation, and SCC behaviour.
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