Fatigue behaviour of M2 and M42 high speed steel up to the gigacycle regime
- Author(s)
- Christian Sohar, Agnieszka Betzwar-Kotas, Christian Gierl, Brigitte Weiss, Herbert Danninger
- Abstract
The fatigue behaviour of two ingot metallurgy high speed steels - M2 and M42/Bohler S600 and S500, respectively - was investigated up to N(max) = 10(10) loading cycles employing an ultrasonic frequency resonance testing system in fully reversed tension-compression mode. Testing was done parallel to the rolling direction. Fatigue failure in the tested cycle number range of 10(5) to 10(10) cycles occurred at stress amplitudes between 900 and 500 MPa, respectively. Failure was initiated at internal carbide clusters, internal and subsurface non-metallic inclusions, and at primary carbides/carbide clusters located at/near the specimen surface, the latter of which represented the dominant failure mode. The obtained S-N curves revealed a continuous downward slope without any indication for a plateau region, and hardly any difference was observed between the two steels. In case of internal and subsurface failures the fracture surfaces revealed so-called fish-eye patterns formed around the crack origins. For at/near surface failures, half of fish-eye could be observed. In the vicinity of the crack nucleation site a granular area was detected followed by a fracture surface zone showing rather low surface roughness, thus appearing dark in the scanning electron micrographs.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Technische Universität Wien
- Journal
- Kovove Materialy - Metallic Materials
- Volume
- 47
- Pages
- 147-158
- No. of pages
- 12
- ISSN
- 0023-432X
- Publication date
- 2009
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103023 Polymer physics, 210006 Nanotechnology, 103018 Materials physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/56c70ccd-0174-45af-82d5-c429f54ee69d