Abstract
This paper presents the results of comparative corrosion resistance studies of stainless steels manufactured by selective laser melting (SLM) in the initial state with subsequent heat treatment and machining. Pitting corrosion tests are carried out, according to ASTM G48 method A in 10% FeCl3·6H2O solution at elevated temperature and exposure time for 5h. The studies were performed on the AISI 321 and AISI 316L stainless steels manufactured by SLM. It was obtained that laser scanning speed decrease led to density rise by other SLM parameters being equal. Porosity affected to the stainless steel corrosion behaviour significant. Metal density decrease resulted to corrosion rate rise. Microstructure examination showed that pitting corrosion development depended on surface steel condition.
Highlights
This paper presents the results of comparative corrosion resistance studies of stainless steels manufactured by selective laser melting (SLM) in the initial state with subsequent heat treatment and machining
It should be noticed treatment has a different influence on corrosion resistance of AISI 321 and AISI 316L
Surface machining of SL-melted AISI 316L obtained by 800 mm/s results to corrosion loss increasing by 3%
Summary
This paper presents the results of comparative corrosion resistance studies of stainless steels manufactured by selective laser melting (SLM) in the initial state with subsequent heat treatment and machining. It is necessary to ensure high corrosion resistance with the complex of mechanical properties of the SLM-materials for these applications It is well-known that stainless steels are susceptible to pitting corrosion in chloride solutions like sea water. There is a number of standards to evaluate corrosion behavior including cyclic potentiodynamic polarization measurements, immersion-test in various corrosion environment (3,5% or 5% NaCl, 10% FeCl3·6H2O) at different temperature and time exposition, 5% aqueous NaCl salt spray testing. These test methods allow to ranking corrosion resistance level of cast and wrought stainless steels. The aim of this research was to evaluate pitting corrosion resistance of SL-melted stainless steel using microstructure examination with 3D corrosion damage study
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