Fatigue Properties of Notched Specimens of Ti-6Al-4V Alloy.

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  • Ｔｉ‐６Ａｌ‐４Ｖ合金切欠き材の疲労特性
  • Ti-6Al-4V ゴウキン キリカキ ザイ ノ ヒロウ トクセイ

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In this study, rotating bending fatigue tests have been carried out to investigate the fatigue strength of plain and circumferentially notched specimens of Ti-6 Al 4 V alloy. The purpose of this work is to evaluate fatigue strength and notch sensitivity under various kdnds of stress concentrations. The notch radius of specimens varies from ∞ (plain specimen) to 2.5, 2.0, 1.5, 1.3, 1.0, 0.5, 0.4, 0.2, and 0.1 mm. According to the experiment results, it is found that the notch sensitivity of Ti-6Al-4V alloy for blunt notch is remarkably lower than that of sharper notch. The cause of this phenomenon is considered that slip system is limited fairly due to the crystal structure (hcp) of this kind of material. Considering to the influence of the stress gradient there is a clear difference between blunt notch and sharp notch for the surface state of tested portion. The non propagating microcracks at the specimen surface could not be observed for all notched specimens including plain specimen subjected under the stress amplitude of fatigue limit by N=107 cycles.

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