Fatigue Strength of Conventionally Cast Tool Steels and its Dependence of Carbide Microstructure
2012 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 1, 83-90 p.Article in journal (Refereed) Published
The axial fatigue strength at two million cycles was experimentally determined for two conventionally cast tool steels and successfully compared with results from a fatigue limit model. Specimens were tested both in the rolling and transverse direction and showed large differences in fatigue properties due to the segregated carbide microstructure. Rolling direction specimens experienced higher fatigue strength than the transverse direction specimens. This is due to smaller carbides present in the load affected cross section of the rolling direction fatigue test bars compared to the cross section of the transverse direction fatigue test bars. Fractographic analysis of failed specimens showed that large carbides had caused fatigue failure, which was also predicted by the model. Measured size distributions of carbides and inclusions were used as input data in the model. The probability that at least one particle will be present in the material volume having a size larger than the threshold value for crack propagation was calculated.
Place, publisher, year, edition, pages
Wiley-Blackwell, 2012. Vol. 83, no 1, 83-90 p.
Tool steel, fatigue, carbide microstructure, size distribution, model
Metallurgy and Metallic Materials
Research subject SRA - Production
IdentifiersURN: urn:nbn:se:kth:diva-7942DOI: 10.1002/srin.201100219ISI: 000298743000008ScopusID: 2-s2.0-84855384146OAI: oai:DiVA.org:kth-7942DiVA: diva2:13126
FunderXPRES - Initiative for excellence in production research
QC 201202062008-01-312008-01-312016-04-26Bibliographically approved