S0305-5-3 ショットピーニング処理を施したマグネシウム合金AZ80押出し材の超高サイクル疲労特性([S0305-5]超長寿命)

概要

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In order to investigate the effect of shot peening (SP) on fatigue strength of extruded magnesium alloys, cantilever-type rotating bending fatigue test was performed in laboratory air at room temperature using hourglass shaped specimens of AZ80 extruded (F-specimen) and treated by an artificial aging after extrusion (T5-specimen), which were treated with two SP conditions. From the results, surface roughness induced by SP was sensitive to the fatigue strength of this material. The specimen slightly removed surface roughness showed the improvement of fatigue strength in high-stress amplitude level but not in low-stress amplitude level. Fatigue crack initiation site was changed from surface to subsurface depending on applied stress amplitude by the effect both of compressive residual stress and high hardness on surface layer.
2010-09-04