Gigacycle fatigue of ultra high density sintered alloy steels
- Author(s)
- Herbert Danninger, C. Xu, Golta Khatibi, Brigitte Weiss, Björn Lindqvist
- Abstract
Sintered steel specimens with density levels of up to 7·6 g cm−3
have been prepared from Cr–Mo and Mo prealloyed powders. The fatigue
response has been studied using an ultrasonic resonance testing device
that enabled testing up to 109 cycles. It showed that the
fatigue endurance strength can be drastically increased by raising the
density and that the sintering conditions are effective, though less
than the density. The existence of a true fatigue limit was disproved up
to 109 cycles for all materials tested, with sintered steels
thus being similar to wrought ones. Cr–Mo steels was shown to be
superior to Mo alloyed grades due to the markedly finer as sintered
microstructure and higher sintering activity. Fatigue crack initiation
was found to originate from pores at first at multiple sites, with
microstructural orientation being dominant compared to the direction of
stress; with progressive loading, some cracks join to form a propagating
macrocrack from which the final failure then starts.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Technische Universität Wien, Höganäs AB
- Journal
- Powder Metallurgy
- Volume
- 55
- Pages
- 378-387
- No. of pages
- 10
- ISSN
- 0032-5899
- DOI
- https://doi.org/10.1179/1743290112Y.0000000001
- Publication date
- 2012
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 210006 Nanotechnology, 103018 Materials physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/gigacycle-fatigue-of-ultra-high-density-sintered-alloy-steels(317efaca-c2b7-45fb-bb89-f5a3beba3a47).html