Effects of Plasma Ion Nitriding Temperatures on Cavitation-Erosion Resistance of STS 304 in Seawater
S.O. Chonga, S.J. Kimb
aDNV GL, Division of Maritime, Busan, 46971, Rep. of Korea
bMokpo Maritime University, Division of Marine Engineering, Mokpo, 58628, Rep. of Korea
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Plasma ion nitridation was performed on stainless steel at various temperature parameters to characterize cavitation-erosion resistance under seawater conditions. Plasma ion nitriding was carried out at a relatively low temperature of 400 to 500° for 10 h at a gas ratio of 25% N2 + 75% H2 and a chamber pressure of 250 Pa in consideration of corrosion resistance by chlorine ions. Cavitation-erosion experiments were conducted for 10 h in compliance with modified ASTM G-32. The cavitation-erosion test for 10 h showed the lowest surface damage, weight loss, and depth of damage at 450°, where the γN phase was most deeply formed. On the other hand, at 500°, the cavitation-erosion damage tended to increase with increasing γ'-Fe4N phase and CrN.

DOI:10.12693/APhysPolA.135.968
topics: plasma, stainless steel, cavitation-erosion, seawater, corrosion resistance