Comparison of the effects of submerged laser peening,cavitation peening and shot peening on the improvement of the fatigue strength of magnesium alloy AZ31  

作　　者：Hitoshi Soyama Chieko Kuji Yiliang Liao 

机构地区：[1]Department of Finemechanics,Tohoku University,6-6-01 Aoba,Aramaki,Aoba-ku,Sendai 980-8579,Japan [2]Department of Industrial and Manufacturing Systems Engineering,Iowa State University,2529 Union Dr.,Ames,IA 50011,United States of America

出　　处：《Journal of Magnesium and Alloys》2023年第5期1592-1607,共16页镁合金学报（英文）

基　　金：This work was partly supported by JSPS KAKENHI,Grant Numbers 20H02021 and 22KK0050.

摘　　要：To investigate the improvement in the fatigue strength of magnesium alloy by peening methods,magnesium alloy AZ31 was treated by submerged laser peening(SLP),cavitation peening(CP),and shot peening(SP),and the fatigue properties were evaluated by a plane bending fatigue test.In the case of SLP,both the impact induced by laser ablation(LA)and that caused by laser cavitation(LC),which developed after LA,were used.In the present study,the fatigue life at a constant bending stress was examined to determine the suitable coverage.It was found that the fatigue strengths at N=10^(7)for the SLP,CP,and SP specimens treated by each optimum condition were 56%,18%,and 16%higher,respectively,than that of the non-peened(NP)specimen,which was 97 MPa.The key factors in the improvement of fatigue strength by peening methods were work hardening and the introduction of compressive residual stress.

关 键 词：Magnesium alloy Fatigue strength Laser peening Cavitation peening Shot peening 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG668[金属学及工艺—金属材料]