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Pitting And Crevice Corrosion Resistance Of A Direct Metal Laser Sintered (DMLS) 316L Stainless Steel In Artificial Seawater

Picture for Pitting And Crevice Corrosion Resistance Of A Direct Metal Laser Sintered (DMLS) 316L Stainless Steel In Artificial Seawater
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Product Number: 51321-17006-SG
Author: Claudia Prieto; Marc Singer; David Young
Publication Date: 2021
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The use of 2%-Mo containing austenitic stainless steels is a common practice for marine applications, such as for the fabrication of fuel nozzles and impellers. Such geometrically complex parts can be manufactured more efficiently using additive manufacturing techniques, such as the direct metal laser sintering process (DMLS). However, research has revealed that 316-type stainless steels are not entirely exempt from undergoing
localized attack. Environmental factors, such as chloride content, temperature and oxygen levels are key governing factors limiting the application of 2%-Mo containing austenitic stainless steels. Moreover, the susceptibility to localized attack for additively manufactured products, such as 316L DMLS, has been postulated to significantly increase due to residual porosity, surface asperity and microstructural defects inherent to the additive manufacturing process. Since the additive manufacturing of geometrically complex parts confers advantages in terms of design, it is essential to determine if their performance against corrosion would compromise their real-world applicability. By using aerated artificial seawater per ASTM D1141 and cyclic potentiodynamic polarization (CPP), the metastable pitting characteristics of a 316L stainless steel manufactured by the DMLS process was characterized. Moreover, the effect of an argon quenched heat
treatment was explored. A cold-rolled 316L stainless steel, as-received and heat-treated, was used as a reference for this study. Results indicated that the heat treatment increased the resistance to pitting initiation of the 316L stainless steel made by DMLS as inherent microstructural defects were healed.

The use of 2%-Mo containing austenitic stainless steels is a common practice for marine applications, such as for the fabrication of fuel nozzles and impellers. Such geometrically complex parts can be manufactured more efficiently using additive manufacturing techniques, such as the direct metal laser sintering process (DMLS). However, research has revealed that 316-type stainless steels are not entirely exempt from undergoing
localized attack. Environmental factors, such as chloride content, temperature and oxygen levels are key governing factors limiting the application of 2%-Mo containing austenitic stainless steels. Moreover, the susceptibility to localized attack for additively manufactured products, such as 316L DMLS, has been postulated to significantly increase due to residual porosity, surface asperity and microstructural defects inherent to the additive manufacturing process. Since the additive manufacturing of geometrically complex parts confers advantages in terms of design, it is essential to determine if their performance against corrosion would compromise their real-world applicability. By using aerated artificial seawater per ASTM D1141 and cyclic potentiodynamic polarization (CPP), the metastable pitting characteristics of a 316L stainless steel manufactured by the DMLS process was characterized. Moreover, the effect of an argon quenched heat
treatment was explored. A cold-rolled 316L stainless steel, as-received and heat-treated, was used as a reference for this study. Results indicated that the heat treatment increased the resistance to pitting initiation of the 316L stainless steel made by DMLS as inherent microstructural defects were healed.

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