熱間型用鋼の疲労強度に及ぼす軟窒化処理の影響 : 熱間金型への軟窒化処理の適用第2報

概要

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It was recognized in the previous work that low temperature gas nitrocarburizing (LTGNC) was effective to prolong the lives of hot-work dies, such as aluminum extrusion dies, die-casting dies and press-forging dies. One of the reasons of this effect was found to be the improvement of wear resistance of die surface due to LTGNC. In this study, the effect of LTGNC on rotating beam fatigue life of a hot-work die steel (JIS SKD61, AISI H13) at room and elevated temperatures, and on thermal fatigue life was investigated. As a result, it was found that LTGNC was effective to improve the endurance limit of a hot-work die steel at room and elevated temperatures. On the other hand, it was also found that LTGNC was detelious to fatigue life at high stress levels and to thermal fatigue life.
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