Effect of microshot peening on fatigue strength of spring steel

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  • ばね鋼の疲労強度に及ぼすマイクロショットピーニングの影響
  • バネ コウ ノ ヒロウ キョウド ニ オヨボス マイクロショットピーニング ノ エイキョウ

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Abstract

The effects of microshot peening on the surface characteristics and fatigue strength of spring steel were investigated. An air-type machine was used. The microshots used consisted of high-carbon cast steel and cemented carbide with an average diameter of 0.1 mm. Air pressure was 0.6 MPa and peening time was in the range of 10 – 100s. As the peening time increased, surface roughness of the peened workpiece decreased. The use of microshot was a very effective means of reducing surface defects. The microshot peening process was very efficient in improving the fatigue life of spring steel, especially at a high number of cycles. The use of hard microshot was found to cause a significantly enhanced peening effect for spring steel.

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