Cyclic plastic behavior of additively manufactured Ti-6Al-4V under uniaxial and multiaxial non-proportional loading

Stefano Bressan, Fumio Ogawa, Takamoto Itoh, Filippo Berto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cyclic plastic behavior of additively manufactured Ti-6Al-4V titanium alloy was experimentally investigated under non-proportional multiaxial cyclic loading. Four cylindrical hollow specimen types were fabricated using laser powder bed fusion (L-PBF). The typology of each specimen was defined by the orientation of the layers and application of a stress-relief heat treatment post production. Then, the specimens’ microstructures were analyzed. Stress–strain cyclic testing in the specimens’ plastic region resulted in near-equivalent curves for each fabricated specimen type. Fatigue tests evidenced that the fatigue life was similar regardless of heat-treatment and layer orientation. Hysteresis loops showed a higher energy absorption for the heat-treated components. Drastic softening has been detected in the majority of the tests and cracks initiating from internal voids, internal defects and surface could be observed.

Original languageEnglish
Pages (from-to)155-164
Number of pages10
JournalInternational Journal of Fatigue
Volume126
DOIs
Publication statusPublished - 2019 Sep
Externally publishedYes

Keywords

  • Additive manufacturing
  • Low-cycle fatigue
  • Multiaxial fatigue
  • Non-proportional loading
  • Titanium alloys

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Cyclic plastic behavior of additively manufactured Ti-6Al-4V under uniaxial and multiaxial non-proportional loading'. Together they form a unique fingerprint.

  • Cite this