Thermomechanical fatigue of ductile cast iron and its life prediction

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DOIResolve DOI: http://doi.org/10.1007/s11661-015-2873-9
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TypeArticle
Journal titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
ISSN1073-5623
SubjectCreep; Fatigue damage; Fatigue of materials; Finite element method; Hysteresis; Iron; Iron compounds; Stress analysis; Damage accumulation; Ductile cast irons; Hysteresis behavior; Intergranular embrittlement; Low cycle fatigues; Physical mechanism; Temperature range; Thermo mechanical fatigues (TMF); Cast iron
AbstractThermomechanical fatigue (TMF) behaviors of ductile cast iron (DCI) were investigated under out-of-phase (OP), in-phase (IP), and constrained strain-control conditions with temperature hold in various temperature ranges: 573 K to 1073 K, 723 K to 1073 K, and 433 K to 873 K (300 °C to 800 °C, 450 °C to 800 °C, and 160 °C to 600 °C). The integrated creep-fatigue theory (ICFT) model was incorporated into the finite element method to simulate the hysteresis behavior and predict the TMF life of DCI under those test conditions. With the consideration of four deformation/damage mechanisms: (i) plasticity-induced fatigue, (ii) intergranular embrittlement, (iii) creep, and (iv) oxidation, as revealed from the previous study on low cycle fatigue of the material, the model delineates the contributions of these physical mechanisms in the asymmetrical hysteresis behavior and the damage accumulation process leading to final TMF failure. This study shows that the ICFT model can simulate the stress–strain response and life of DCI under complex TMF loading profiles (OP and IP, and constrained with temperature hold).
Publication date
PublisherSpringer International Publishing
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21275824
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Record identifier9b4d58a3-ec83-4be9-bc32-af81a92b227d
Record created2015-07-14
Record modified2016-05-09
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