高Si硬引線の回転曲げ疲労強度に及ぼすショットピーニングの有無と微小ストレート切欠きの影響

概要

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In late years a study of advantageous high Si hard-drawn wire is pushed forward in comparison with oil tempered wires on a cost side. In this study, influence of the minute notch which gave it to rotary bending fatigue strength of the high Si hard-drawn wire and influence of the shot peening were investigated. The test bar which we gave shot peening treatment and notch to was prepared, and each hardness, residual stress, fatigue strength were investigated. A Nakamura-type rotary bending fatigue testing machine was used in fatigue test. SEM was used for fracture surface and organization evaluation. The fatigue limit of shot peening materials rose 45% in comparison with untreated material. When the linear notch of the 30 degrees〜90 degrees notch angle was given, in the case of notch angles less than 60 degrees, the fatigue limit of untreated material and the electrolytic grinding material became equal to smooth specimen. Influence of the wire drawing structure is considered as a reason.
2010-02-25