Abstract
Critical nitrogen hydrogen ratio in plasma nitriding was primarily investigated to get enhanced performance for 38CrMoAl steel. The modified surface layer was characterized by optical microscopy (OM), X-ray diffraction (XRD), micro-hardness tester and wear tester. The results showed that the critical nitrogen hydrogen ratio was 1:5 while plasma nitriding at 540℃ for 6h. Under this condition, no compound layer was formed, and more importantly, brittleness was significantly decreased, accompanied with high surface hardness, while the compound layer was formed accompanied with lower surface hardness and serious brittleness upon nitriding with nitrogen hydrogen ratio higher than the critical value.
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