Low temperature creep in a high strength roller bearing steel
2016 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 100, 109-125 p.Article in journal (Refereed) Published
Noticeable low temperature creep was established for a bainitic and a martensitic microstructure of the 100CrMnMo8 high strength roller bearing steel. The response revealed primary creep that differed between the microstructures, following a power law for martensite and the logarithmic description for bainite. The detected creep was pressure sensitive, higher in tension than in compression for the same stress level, following the strength differential effect (SDE) at material yielding. Two models were proposed where the stress variable for the pressure effect was based on the Drucker-Prager yield function and deviatoric creep strains were derived from a non-associated von Mises potential. Model parameters were determined from experimental series on the respective microstructure. When the models were evaluated against the experiments the accuracy was of the same order as the effects of different heat treatment batches and different load application rates. The importance of different material parameters in the descriptions was discussed.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 100, 109-125 p.
Low temperature creep, Strength differential effect, High strength steel, Power law creep, Logarithmic creep
IdentifiersURN: urn:nbn:se:kth:diva-192718DOI: 10.1016/j.mechmat.2016.06.010ISI: 000381953800010ScopusID: 2-s2.0-84976292741OAI: oai:DiVA.org:kth-192718DiVA: diva2:974244
QC 201609262016-09-262016-09-202016-09-26Bibliographically approved