Abstract
Cold-sprayed AISI 316L stainless steel coatings are treated to form an austenite phase with excessive dissolved nitrogen (known as the S-phase) by plasma nitriding at temperatures below 450 °C. The S-phase is a hard and wear-resistant layer with high corrosion resistance. However, the S-phase layer formed after only nitriding is thin and the hardness abruptly decreases at a certain depth; it lacks mechanical reliability. We examined two types of combined low-temperature plasma treatment to enhance the mechanical reliability of the S-phase layer: (i) sequential and (ii) simultaneous. In the sequential plasma treatment, the carburizing step was followed by nitriding. In the simultaneous treatment, the nitriding and carburizing steps were conducted at the same time. Both combined plasma treatments succeeded in thickening the S-phase layers and changed the hardness depth profiles to decrease smoothly. In addition, anodic polarization measurements indicated that sequential treatment involving carburizing followed by nitriding for 2 h each resulted in high corrosion resistance.
Highlights
Conventional nitriding and carburizing for austenitic stainless steel plates at treatment temperatures over 500 ◦ C improve the surface hardness, but reduce the corrosion resistance due to the formation of chromium nitride or carbide
Anodic polarization measurements indicated that sequential treatment involving carburizing followed by nitriding for 2 h each resulted in high corrosion resistance
450 ◦ C for austenitic stainless steel plates can result in the formation of an austenite phase with excessive dissolved nitrogen known as the S-phase
Summary
Conventional nitriding and carburizing for austenitic stainless steel plates at treatment temperatures over 500 ◦ C improve the surface hardness, but reduce the corrosion resistance due to the formation of chromium nitride or carbide. Low-temperature nitriding and carburizing could be applied to austenitic stainless steel plates used under severe friction conditions. These treatments restrict the formation of chromium nitride or carbide, maintaining the corrosion resistance [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
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