The use of various peening methods to improve the fatigue strength of titanium alloy Ti6Al4V manufactured by electron beam melting

Hitoshi Soyama, Yuya Okura

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Additive manufacturing (AM) of metals is one of the foremost methods used for making medical implants and components for aviation. However, the fatigue strength of AM metals is weaker than that of the bulk equivalent. Mechanically treating the surface, such as by shot peening, can improve the fatigue strength, and novel peening methods without shot have also been proposed. In this paper, in order to demonstrate the improvements made in AM metals by various peening methods, specimens made of titanium alloy Ti6Al4V manufactured by electron beam melting (EBM) were treated by shot peening, laser peening and cavitation peening, then assessed by a plate bending fatigue test. In the case of shot peening, the shots were accelerated by a water jet to mitigate the incidence of dust during the process. For laser peening, the specimen was placed in water, and the effect of the impact produced at the target due to collapsing bubbles, which developed after laser ablation of the surface, was greater than the effect due to the laser ablation itself. For cavitation peening, the cavitation was generated by injecting a high speed water jet into water. In each case improvements in the fatigue strength of the Ti6Al4V were made. Improvements of 104% by laser peening, 84% by cavitation peening and 68% by shot peening compared with a non-peened specimen were achieved.

Original languageEnglish
Pages (from-to)1000-1015
Number of pages16
JournalAIMS Materials Science
Volume5
Issue number5
DOIs
Publication statusPublished - 2018

Keywords

  • Additive manufacturing
  • Cavitation peening
  • Electron beam melting
  • Fatigue strength
  • Laser peening
  • Mechanical surface treatment
  • Medical implant
  • Shot peening
  • Titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'The use of various peening methods to improve the fatigue strength of titanium alloy Ti6Al4V manufactured by electron beam melting'. Together they form a unique fingerprint.

Cite this