Title: Influence of gas nitriding on fatigue resistance of maraging steel
Abstract: Marage-350 steel containing 12 and 24 vol% of retained austenite was subjected to gas nitriding at 450°C for 8 h in ≈35% dissociated NH3 gas atmosphere. The depth of the nitride layer decreased from 55 to 35 μm as the retained austenite content is doubled. The layer was predominantly composed of Fe4N phase. The surface hardness of the material containing 12 and 24 vol% of austenite after nitriding was improved from 536 to 753 Hv and 470 to 705 Hv, respectively. Fatigue tests were performed on smooth specimens at a stress ratio (R)=0.1. It was shown that nitriding played the principal role in the improvement of fatigue strength and sub-surface crack nucleation.
Publication Year: 1999
Publication Date: 1999-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 53
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