K-0534 高炭素鋼の鍛造比と疲労限度の関係(S04-5 小型・薄板材の疲労と実機信頼性)(S04 金属材料の組織と疲労強度信頼性)

概要

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Statistical rotating bending fatigue tests were performed in order to clarify the relationship between forging ratio (FR) and fatigue limit with seven forging ratios. The FR value was ranged from 1.0 (as cast) to 5.0. The specimen was made of high-carbon steel. Fatigue strength rapidly increased with increase of the FR value, and then it was saturated at FR≧1.7. Although dispersion of the fatigue limit decreased once with increase of the FR value, the standard deviation of fatigue limit for FR=5.0 was larger than that for FR=4.0. Therefore, increase of FR does not always improve fatigue strength properties. Fatigue cracks were initiated from porosity, impurity particle, ferrite, etc. The evaluated fatigue limit, which is obtained by universal slope method, agreed well with the experimental value.
社団法人日本機械学会の論文
2001-08-22