Fatigue behavior of Ti-6Al-4 V alloy manufactured by cold metal fusion

Deborah Kaschube*, Tobias Pawlowitz, Claus-Henning Solterbeck, Jana Schloesser, Mohammad Malekan, Berend Bohlmann

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This study investigates the fatigue behavior of small specimens of Ti-6Al-4 V produced using the additive manufacturing process cold metal fusion. As the process is still comparatively new, no data were available beforehand. Strain-controlled fatigue tests were carried out on small specimens under alternating loads. The results are presented in the form of a stress–strain diagram according to Ramberg–Osgood and a strain–life curve according to Coffin–Manson. Comparison with results reported for similar specimens fabricated via the laser engineered net shaping (LENS) additive method shows comparable fatigue behavior. Analysis of the fracture surfaces shows a very mixed fracture pattern with an often mountainous surface, especially for specimens tested under high strain. This made the detection of crack initiation very difficult for those specimens. The analysis of specimens tested under low strain reveals large surface defects to be the crack initiators. Smaller secondary cracks form at internal crack initiation facets.

Original languageEnglish
JournalFatigue & Fracture of Engineering Materials & Structures
Volume47
Issue number3
Pages (from-to)647-661
ISSN8756-758X
DOIs
Publication statusPublished - Mar 2024

Keywords

  • Coffin–Manson
  • Ramberg–Osgood
  • Ti6Al4V
  • cold metal fusion
  • low cycle fatigue

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