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- Title
Fatigue behavior of Ti‐6Al‐4 V alloy manufactured by cold metal fusion.
- Authors
Kaschube, Deborah; Pawlowitz, Tobias; Solterbeck, Claus‐Henning; Schloesser, Jana; Malekan, Mohammad; Bohlmann, Berend
- 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. Highlights: Fatigue performance of cold metal fusion (CMF) manufactured parts is comparable with laser engineered net shaping (LENS) manufactured parts.Numerous pores are present.Analysis of specimens tested under low strain reveals large surface defects to be the crack initiators.
- Subjects
COLD fusion; ALLOY fatigue; SURFACE defects; STRESS-strain curves; MANUFACTURING processes; FRACTOGRAPHY
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2024, Vol 47, Issue 3, p647
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14194