Fatigue resistance of low pressure nitrided Cr-Mo low alloy steels
METALLURGIA ITALIANA(2022)
摘要
Fatigue resistance of steel parts can be improved by nitriding, the more the deeper is the layer affected by nitrogen diffusion, as stated by the Lessells-Firrao law. Low-pressure nitriding has been applied to wheel's hubs fabricated with a quenched and tempered Cr-Mo low alloy steel. N diffusion depths have been compared to similar results obtained with the same type of automotive parts subjected to classical gas nitriding. 12 h total low-pressure treatment time provided an almost 100% increase of hardened depth over 40 h gas nitrided parts. Both treatments allowed reaching an adequate fatigue life, whereas induction hardened parts did not. X-ray diffraction analysis provided phase constitution of top converted layers in both nitriding cases. A rationale based on the effect of early treatment stage top layer formation has been developed.
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关键词
NITRIDING,LOW PRESSURE NITRIDING,FATIGUE RESISTANCE,X-RAY DIFFRACTION,DIFFUSION DEPTHS
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