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Creep-fatigue properties of austenitic cast iron D5S with tension and compression dwell: A dislocation density-based crystal plasticity study
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-3281-6835
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-9509-2811
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-1102-4342
2022 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 860, p. 144212-, article id 144212Article in journal (Refereed) Published
Abstract [en]

To predict and better understand the creep-fatigue behaviour of austenitic cast iron D5S under tension and compression dwell at 800 degrees C, a physics-based crystal plasticity model that describes the complex rate-and temperature-dependent deformation of the material as a function of the dislocation density is implemented. In addition to the tension and compression dwell direction, the effect of three different dwell times (30, 180 and 600 s) on the creep-fatigue properties is investigated. The dislocation density-based crystal plasticity simulations are compared to experimental tests from a prior work. While relaxation tests and low-cycle fatigue (LCF) tests without dwell assist in systematically identifying the material parameters, creep-fatigue (CF) data is used to validate the predictions. The virtual testing is performed on a large-scale representation of the actual test specimen with a polycrystalline structure. To analyse the fatigue damage mechanism, small-scale predictions are also conducted using a micromechanical unit cell approach. Here, a single graphite nodule frequently found in the material is embedded into the austenitic matrix. In the present work, a close agreement is achieved between the predicted CF behaviour and the experimental results. Consistent with the experimental findings, the simulation results show that the addition of compression dwell leads to an uplift of the overall tensile stress level, which significantly reduces the fatigue life of the material. The unit cell studies demonstrate that during this uplift, a strong localisation of stresses and strains arises at the graphite/matrix interface, triggering the nucleation and growth of cavities and/or debonding.

Place, publisher, year, edition, pages
Elsevier BV , 2022. Vol. 860, p. 144212-, article id 144212
Keywords [en]
Creep-fatigue, Dwell-fatigue, Ductile cast iron, Crystal plasticity, Dislocation density
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-323017DOI: 10.1016/j.msea.2022.144212ISI: 000894180200002Scopus ID: 2-s2.0-85142157705OAI: oai:DiVA.org:kth-323017DiVA, id: diva2:1725965
Note

QC 20230112

Available from: 2023-01-12 Created: 2023-01-12 Last updated: 2023-12-07Bibliographically approved

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Fischer, TimXiang, ShengmeiDahlberg, Carl F. O.Hedström, Peter

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