On the pitting behaviour of laser powder bed fusion prepared 316L stainless steel upon post-processing heat treatments

Ke Wang; Qi Chao; Murugesan Annasamy; Peter D. Hodgson; Sebastian Thomas; Nick Birbilis; Daniel Fabijanic

doi:10.1016/j.corsci.2021.110060

On the pitting behaviour of laser powder bed fusion prepared 316L stainless steel upon post-processing heat treatments

Ke Wang
, Qi Chao^*
, Murugesan Annasamy
, Peter D. Hodgson
, Sebastian Thomas
, Nick Birbilis
, Daniel Fabijanic

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

Abstract

Type 316L stainless steel manufactured by laser powder bed fusion (LPBF) in conjunction with appropriate post-treatment has been demonstrated to offer superior pitting resistance and a distinct pitting mechanism compared to wrought 316L. This work examines the effect of post-processing annealing time, temperature and microstructural changes on the pitting behaviour of LPBF 316L using potentiodynamic and potentiostatic polarisation in 0.6 M NaCl. Preferential pitting at melt pool boundaries was observed, due to heterogeneity of micro-strain or lattice imperfection. High temperature annealing resulted in the transformation of amorphous oxides with associated Cr-depletion, leading to a reduction of E_pit and E_rp.

Original language	English
Article number	110060
Journal	Corrosion Science
Volume	197
DOIs	https://doi.org/10.1016/j.corsci.2021.110060
Publication status	Published - 1 Apr 2022

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10.1016/j.corsci.2021.110060

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title = "On the pitting behaviour of laser powder bed fusion prepared 316L stainless steel upon post-processing heat treatments",

abstract = "Type 316L stainless steel manufactured by laser powder bed fusion (LPBF) in conjunction with appropriate post-treatment has been demonstrated to offer superior pitting resistance and a distinct pitting mechanism compared to wrought 316L. This work examines the effect of post-processing annealing time, temperature and microstructural changes on the pitting behaviour of LPBF 316L using potentiodynamic and potentiostatic polarisation in 0.6 M NaCl. Preferential pitting at melt pool boundaries was observed, due to heterogeneity of micro-strain or lattice imperfection. High temperature annealing resulted in the transformation of amorphous oxides with associated Cr-depletion, leading to a reduction of Epit and Erp.",

keywords = "Pitting corrosion, Polarisation, Potentiostatic, Repassivation, Stainless steel",

author = "Ke Wang and Qi Chao and Murugesan Annasamy and Hodgson, \{Peter D.\} and Sebastian Thomas and Nick Birbilis and Daniel Fabijanic",

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doi = "10.1016/j.corsci.2021.110060",

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T1 - On the pitting behaviour of laser powder bed fusion prepared 316L stainless steel upon post-processing heat treatments

AU - Wang, Ke

AU - Chao, Qi

AU - Annasamy, Murugesan

AU - Hodgson, Peter D.

AU - Thomas, Sebastian

AU - Birbilis, Nick

AU - Fabijanic, Daniel

PY - 2022/4/1

Y1 - 2022/4/1

N2 - Type 316L stainless steel manufactured by laser powder bed fusion (LPBF) in conjunction with appropriate post-treatment has been demonstrated to offer superior pitting resistance and a distinct pitting mechanism compared to wrought 316L. This work examines the effect of post-processing annealing time, temperature and microstructural changes on the pitting behaviour of LPBF 316L using potentiodynamic and potentiostatic polarisation in 0.6 M NaCl. Preferential pitting at melt pool boundaries was observed, due to heterogeneity of micro-strain or lattice imperfection. High temperature annealing resulted in the transformation of amorphous oxides with associated Cr-depletion, leading to a reduction of Epit and Erp.

AB - Type 316L stainless steel manufactured by laser powder bed fusion (LPBF) in conjunction with appropriate post-treatment has been demonstrated to offer superior pitting resistance and a distinct pitting mechanism compared to wrought 316L. This work examines the effect of post-processing annealing time, temperature and microstructural changes on the pitting behaviour of LPBF 316L using potentiodynamic and potentiostatic polarisation in 0.6 M NaCl. Preferential pitting at melt pool boundaries was observed, due to heterogeneity of micro-strain or lattice imperfection. High temperature annealing resulted in the transformation of amorphous oxides with associated Cr-depletion, leading to a reduction of Epit and Erp.

KW - Pitting corrosion

KW - Polarisation

KW - Potentiostatic

KW - Repassivation

KW - Stainless steel

UR - https://www.scopus.com/pages/publications/85122109620

U2 - 10.1016/j.corsci.2021.110060

DO - 10.1016/j.corsci.2021.110060

M3 - Article

SN - 0010-938X

VL - 197

JO - Corrosion Science

JF - Corrosion Science

M1 - 110060

ER -

On the pitting behaviour of laser powder bed fusion prepared 316L stainless steel upon post-processing heat treatments

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