オーステナイト系焼結ステンレス鋼の耐食性について

概要

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A study of the effects of compacting, sintering, coining and resintering on densification and corrosion resistance of sintered austenitic stainless steel was made using “Daido” 316L stainless steel powder.Results are summarized as follows:(1) The corrosion resistance against strong acid solutions is generally improved with decreasing of porosity, but at the same density level, better corrosion resistance can be obtained if the sintering temperature is higher. It is presumed that this tendency is due to the shape of pore.(2) Coining operation lowers the corrosion resistance while it remarkably improves the density. It is presumed that this is due to the flat pore and crack at grain boundary of powder particle by coining.(3) Along with the coining pressure increases, the corrosion resistance of coined compacts against nitric acid is improved, while it becomes lower against sulfuric acid. It is presumed that these tendencies are due to the strain-hardening of sintered stainless steel by coining.
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