Gigacycle fatigue behavior of a high chromium alloyed cold work tool steel

Author(s)
Christian Sohar, Agnieszka Betzwar-Kotas, Christian Gierl, Brigitte Weiss, Herbert Danninger
Abstract

The influence of carbides and the effect of surface residual stresses (RS), resulting from heat treatment or from the grinding/polishing process, on the fatigue behavior in the gigacycle regime of ingot metallurgy produced D2 type tool steel was examined. RS were found to be responsible for the occurrence of two failure modes: Internal cracks initiating at large primary carbides (clusters) were observed in the cycle number range of 10(5)-10(6), while in the gigacycle regime near-surface cracks originating at primary carbides caused failure, which was related to degradation of the RS by cyclic loading. Simple models were employed estimating the RS degradation process and the local fatigue strength along the specimen cross section as a function of active RS. In absence of considerable RS predominantly near-surface crack initiation was obtained.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Technische Universität Wien
Journal
International Journal of Fatigue
Volume
30
Pages
1137-1149
No. of pages
13
ISSN
0142-1123
DOI
https://doi.org/10.1016/j.ijfatigue.2007.09.012
Publication date
2008
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/gigacycle-fatigue-behavior-of-a-high-chromium-alloyed-cold-work-tool-steel(50c6fb67-f143-4031-bdda-3be8cc43daaf).html