微小切欠きを有する非調質鋼の疲れ強さ (自動車材料<特集>)

概要

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Although microalloyed steel has been widely applied to automobile parts, fatigue properties of actual forged parts with slight notches on their surfaces have not been fully investigated. This study has been performed to clarify the effect of microstructure on the fatigue properties of microalloyed steels. The results obtained are as follows.(1) Fatigue properties with smooth specimens are in good relationship with the mean ferrite size which is defined as the average diameter of hypothetical ferrite particles having the same area as that of actual proeutectoid ferrite.(2) In case of small notch-fatigue specimen, notch sensitivity decreases with increase in the heating temperature. This phenomenon is clearly explained by effective grain size. When the effective grain size is the same as or larger than a half of notch depth, no notch sensitivity is observed.
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