Journal
MATERIALS
Volume 15, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/ma15207151
Keywords
additive manufacturing; laser powder bed fusion; stress corrosion cracking; lack of fusion porosity; localized corrosion; residual stress; machining
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Funding
- University of Padova, Department of Industrial Engineering
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The study investigated stress corrosion cracking (SCC) of laser powder bed fusion-fabricated 316L with different types of defects. Electrochemical polarization measurements were conducted to examine the effect of defect type on corrosion and SCC behavior. The results showed severe localized corrosion and SCC initiation in specimens with a lack of fusion pores, with different morphology of SCC depending on the type of defects.
Stress corrosion cracking (SCC) of laser powder bed fusion-fabricated 316L was studied under the variation in energy input density to emulate the existence of distinctive types of defects. Various electrochemical polarization measurements were performed in as-received polished and ground states, to elucidate the effect of defect type on corrosion and SCC behaviour in marine solution. The results revealed severe localized corrosion attack and SCC initiation for specimens with a lack of fusion pores (LOF). Moreover, the morphology of SCC was different, highlighting a more dominant effect of selective dissolution of the subgrain matrix for gas porosities and a more pronounced effect of brittle fracture at laser track boundaries for the specimens with LOF pores.
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