Abstract
Shot peening improves the fatigue strength of parts with a simple technique. Therefore, it is in applications such as automotive transmission gears. Recently, the demand for automobile fuel efficiency. Thus, the automotive parts are needed to do more intense. Gear fatigue strength that is required is a bending fatigue strength and contact fatigue strength . Contact fatigue strength is sensitive to surface roughness. Therefore, the surface roughness after shot peening must be reduced. To meet this demand in recent years has developed a fine shot of a diameter of 100pm or less. In this section, we report the effects of fine particle shot peenig on carburized parts.
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