Effects of laser shock peening on the ultra-high cycle fatigue performance of additively manufactured Ti6Al4V alloy

Jiang，Qinghong1,2; Li，Shuai1,3; Zhou，Cong1; Zhang，Bi1; Zhang，Yongkang4

2021-12-01

10.1016/j.optlastec.2021.107391

OPTICS AND LASER TECHNOLOGY   影响因子和分区

0030-3992

Although additive manufacturing (AM) allows to fabricate metallic parts with a high static strength comparable to their forged counterparts, the fatigue strength of an AM-ed part is generally inferior, restricting AM from many critical applications. In this study, laser shock peening (LSP) was applied to modify the surface properties of selective laser melting fabricated (SLM-ed) Ti6Al4V titanium alloy. This study performs systematic tests and analyses on the fabricated alloy specimens to characterize their microstructures and mechanical properties including residual stress, tensile strength, ultra-high cycle fatigue (UHCF) strength. The results reveal that LSP can refine microstructure, suppress residual stresses, and delay crack propagation in the affected area. However, the inherent defects in an SLM-ed part, such as unmelted powders, lack of fusion and clusters of α phase, dominate the fatigue failure of the specimens especially in the UHCF regime, resulting in their poor fatigue performance. Meanwhile, The LSP processed specimens showed a lower S-N curve than that of specimens without LSP processing especially in the UHCF regime, which not only results from the inherent defects, but also the increased surface roughness and non-uniform residual stresses.

Laser shock peening Metal additive manufacturing Selective laser melting Ti6Al4V titanium alloy Ultra-high cycle fatigue

EI

英语

第一 ; 通讯

20213510823185

Additives ; Aluminum alloys ; Melting ; Microstructure ; Residual stresses ; Selective laser melting ; Surface roughness ; Tensile strength ; Ternary alloys ; Titanium alloys

Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENGINEERING

2-s2.0-85113372259

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical Engineering,Hong Kong Polytechnic University,Hong Kong
3.School of Mechatronics Engineering,Harbin Institute of Technology,Harbin,150001,China
4.School of Mechanical and Electrical Engineering,Guangdong University of Technology,Guangdong,510006,China

Jiang，Qinghong,Li，Shuai,Zhou，Cong,et al. Effects of laser shock peening on the ultra-high cycle fatigue performance of additively manufactured Ti6Al4V alloy[J]. OPTICS AND LASER TECHNOLOGY,2021,144.

Jiang，Qinghong,Li，Shuai,Zhou，Cong,Zhang，Bi,&Zhang，Yongkang.(2021).Effects of laser shock peening on the ultra-high cycle fatigue performance of additively manufactured Ti6Al4V alloy.OPTICS AND LASER TECHNOLOGY,144.

Jiang，Qinghong,et al."Effects of laser shock peening on the ultra-high cycle fatigue performance of additively manufactured Ti6Al4V alloy".OPTICS AND LASER TECHNOLOGY 144(2021).