熱処理用トレー材SCH13の熱疲労強度 : 第2報-熱処理の影響

概要

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In order to improve tray life, we have already reported about the effect of maximum temperature, grain size, chemical composition, structure change and casting defects on the thermal fatigue characteristic of SCH13.The first investigation was made about the effect on the thermal fatigue according to annealing condition recommended by ACI.Secondly, an investigation was also made about the influence upon thermal fatigue strength after solution treatment of eutectic carbides and changed the distribution of secondary carbide largely.The results obtained are as follows:(1) The annealing condition recommended by ACI is not favorable because of δ-ferrite. Accordingly, the adjustment of chemical composition which causes nil δ-ferrite formation is effective to improve the thermal fatigue of SCH13.(2) Cracks propagate along the δ-ferrite, even when heat treatment is done.(3) The improvement of thermal fatigue for stable austenite results from the precipitation of secondary carbide after solution treatment of eutectic carbide.
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