Improvement of corrosion and cavitation-erosion resistance of stainless steels using plasma ion nitriding for high-speed rotating components

2019 ◽  
Vol 43 (1) ◽  
pp. 18-23
Author(s):  
Sang-Ok Chong ◽  
Seong-Jong Kim
Keyword(s):  
Stainless Steels ◽  
High Speed ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Ion Nitriding ◽  
Cavitation Erosion Resistance

Influence of Glow-Discharge Nitrided Temperatures of Cast Stainless Steel for Cavitation-Erosion Enhancement in Seawater

2021 ◽  
Vol 21 (9) ◽  
pp. 4758-4762
Author(s):  
Sang-Ok Chong ◽  
Seong-Jong Kim
Keyword(s):  
Corrosion Resistance ◽  
High Speed ◽  
Cavitation Erosion ◽  
Sea Water ◽  
Ion Nitriding ◽  
Seawater Environment ◽  
Scherrer Formula ◽  
Xrd Patterns ◽  
Cavitation Erosion Resistance ◽  
Cast Stainless Steel

In this work, corrosion resistance and cavitation-erosion characteristics were investigated by applying plasma ion nitriding technique to cast stainless steels used as materials of high speed rotors under seawater environment. Plasma ion nitriding was performed for 10 h at various temperature parameters with 25% N2 and 75% H2 gas ratio. The cavitation-erosion experiment was carried out under vibration amplitude of 30 °C and sea water temperature of 25 °C according to modified ASTM G32-92. The yN phase that improves corrosion resistance and mechanical properties was formed at the all of experimnetal temperatures after plasma ion nitriding treatment. The crystallite size of phases was calculated through the XRD patterns according to Scherrer formula and obtained smallest nano size of yN phase at 450 °C. Cavitation-erosion resistance was enhanced up to 450 °C but was deteriorated at 500 °C.

Cavitation Erosion Mechanisms of Solution Treated X5CrNi18-10 Stainless Steels

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
I. Bordeaşu ◽  
I. Mitelea ◽  
L. Sălcianu ◽  
C. M. Crăciunescu
Keyword(s):  
Grain Size ◽  
Stainless Steels ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Cavitation Resistance ◽  
Technological Parameters ◽  
Chemical Homogeneity ◽  
Solution Treated ◽  
Erosion Mechanisms ◽  
Cavitation Erosion Resistance

The cavitation erosion resistance of an X5CrNi18-10 stainless steel, solution treated at temperatures in the range of 1000–1100 °C for 5–50 mins, was investigated using a piezoceramic vibrating system. The variation of the technological parameters led to changes in the degree of the chemical homogeneity and the grain size of the austenite. Heating at 1050 °C for 25 mins, followed by water quenching, led to an increase in the cavitation erosion resistance of about 2.45 times compared to the samples heated for 50 mins. A significant improvement of the cavitation resistance was obtained for the sample maintained at 1050 °C compared to the samples annealed at 1000 and 1100 °C. It was found that the associated cavitation erosion resistance is improved for finer granulation and for higher degree of chemical homogeneity of the austenite.

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