Imaging-based fatigue mechanism investigation of additively manufactured TI-6AL-4V

Jie Chen, Changyu Meng, Yongming Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The fatigue characterization of additively manufactured Ti-6Al-4V plays a vital role in ensuring the structural safety. This study focuses on image based surface characterization and the fatigue mechanical property investigation of as-built additively manufactured Ti-6Al-4V. Three sets of processing parameters (the absorbed laser power, scan velocity, building orientation) are adopted corresponding to the EOS nominal settings, lack-of-fusion and keyhole regimes. Before the fatigue testing, the specimens are scanned using X-ray micro-computed tomography (microCT) and the complete surface morphology is obtained. During fatigue testing, the specimen is scanned using microCT after certain numbers of loading cycles to capture the fatigue crack initiation locations and trace the crack growth trajectories. After the fatigue testing is completed, the fractured specimen is scanned by both microCT and scanning electron microscope (SEM). Based on the experimental investigation, vertically built specimens have lower average surface roughness than angled specimens along the transverse direction. Along longitudinal direction, the average surface roughness does not very significantly among all specimens. The fatigue crack may initiate from near surface pores or external rough surface. Cracks initiating from different locations at the similar height coalesce while propagating. Fracture surfaces present tortuous or tearing features, which corresponds to shorter and longer fatigue lives under the same fatigue loading, respectively.

Original languageEnglish (US)
Title of host publicationAdvanced Materials
Subtitle of host publicationDesign, Processing, Characterization, and Applications
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791885574
StatePublished - 2021
EventASME 2021 International Mechanical Engineering Congress and Exposition, IMECE 2021 - Virtual, Online
Duration: Nov 1 2021Nov 5 2021

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)


ConferenceASME 2021 International Mechanical Engineering Congress and Exposition, IMECE 2021
CityVirtual, Online


  • Additive manufacturing
  • Fatigue
  • Image
  • Surface
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Mechanical Engineering


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