Abstract
In this study, plasma ion nitriding technology was applied to investigate the effect of plasma ion nitriding temperature and the surface roughness of SCM440 steel on the durability of SCM440 steel for gear material. The mechanical properties of the plasma ion nitrided specimens were examined using a comprehensive analysis of nitriding depth, phase change, microstructure and micro-Vickers hardness values. As a result, the durability of SCM440 steel was found to be more significantly affected by plasma ion nitriding temperature than surface roughness. As the plasma ion nitriding temperature increased, the composite phase of brittle γâ- Fe4N + ε-Fe2-3N was converted into a single phase of γâ-Fe4N, and the depth of the nitride layer increased, making it suitable for gear materials. Key words: Plasma ion nitriding, SCM440 steel, Durability, Gear
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