フェムト秒レーザピーニング処理によるA2024共材FSW継手の平面曲げ疲労特性改善

抄録

In order to improve the fatigue properties of similar butt friction stir welded joint of A2024 Aluminum alloys, laser peening which was laser peening treatment with femtosecond pulse laser equipment was applied. This femtosecond laser peening does not need water in the peeing processing. And fatigue tests were conducted at stress ratio R= -1, road frequency 23Hz with plane bending fatigue condition. As the results, fatigue property was improved by femtosecond laser peening. Residual stress distribution, Vickers hardness distribution and surface roughness were investigated and the relation between fracture position of specimen and these were investigated.