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Martensite transformation in the fatigue fracture surface of a high strength bearing steel
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6798-2385
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6896-1834
SKF Engn & Res Ctr, POB 2350, NL-3430 DT Nieuwegein, Netherlands..
2019 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 220, article id UNSP 106650Article in journal (Refereed) Published
Abstract [en]

Phase transformation of retained austenite (RA) to martensite was studied considering both stress and strain induced transformations during fatigue crack propagation. X-ray diffraction measurements, performed on the fatigue crack surface obtained through push-pull experiments, showed that almost all RA in the fatigue surface transformed to martensite. A material model that can simulate the phase change including nonlinear isotropic and kinematic hardening behaviors and nonlinear elasticity was used to simulate the fatigue crack growth. Numerical results showed that only a very small amount of RA remained in the crack surface, which agreed with the X-ray diffraction measurements. The effect of phase transformation on crack closure was studied and it was observed in the FE simulations that the crack faces close at an earlier stage when phase change has been taken into account than when it is absent.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 220, article id UNSP 106650
Keywords [en]
Fatigue, Transformation induced plasticity, Stress and strain induced phase transformation, Transformation induced crack closure
National Category
Materials Engineering
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-261936DOI: 10.1016/j.engfracmech.2019.106650ISI: 000487813100025Scopus ID: 2-s2.0-85071975359OAI: oai:DiVA.org:kth-261936DiVA, id: diva2:1361231
Note

QC 20191015

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-11-26Bibliographically approved

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Hazar, SelcukAlfredsson, Bo

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