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 |