Influence of Microstructure on Low-Cycle and Extremely-Low-Cycle Fatigue Resistance of Low-Carbon Steels

Kyungmin Noh; Seyed Amir Arsalan Shams; Wooyeol Kim; Jae Nam Kim; Chong Soo Lee

doi:10.1007/s12540-020-00819-1

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자료유형: 학술저널

저자정보: Kyungmin Noh (Graduate Institute of Ferrous Technology Pohang University of Science and Technology) Seyed Amir Arsalan Shams (Graduate Institute of Ferrous Technology Pohang University of Science and Technology) Wooyeol Kim (Graduate Institute of Ferrous Technology Pohang University of Science and Technology) Jae Nam Kim (Graduate Institute of Ferrous Technology Pohang University of Science and Technology) Chong Soo Lee (Graduate Institute of Ferrous Technology Pohang University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10

발행연도: 2021.10

수록면: 3,862 - 3,874 (13page)

DOI: 10.1007/s12540-020-00819-1

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The goals of this study were to quantify and explain the effects of microstructure on the resistance of low-carbon steels tolow-cycle fatigue and to extremely low-cycle fatigue (ELCF). Three different microstructures (ferrite?pearlite, ferrite?martensite,and ferrite?bainite?martensite) were tested, and their fatigue properties were analyzed using the strain-based Coffin?Manson model and an energy-based model. According to the Coffin?Manson model, ferrite?pearlite showed the bestELCF resistance, whereas in the energy-based model that considers the effect of tensile strength ferrite?bainite?martensiterevealed the highest ELCF resistance. At similar tensile strength, ferrite?bainite?martensite had longer ELCF life than ferrite?martensite; the difference may be a result of the smaller strain incompatibility between bainite and ferrite than betweenferrite and martensite. In all three microstructures, cracks initiated at the surface and propagated into the interior; this resultindicates that fracture mode was not altered during cyclic loading at high strain amplitudes. Ferrite?martensite microstructuredeveloped many sub-cracks surrounding a main crack; they could facilitate propagation of a main crack, and thereby degradefatigue life at high strain amplitudes.

#Extremely low-cycle fatigue #Microstructure #Low carbon steel #Bainite #Martensite

참고문헌 (30)

참고문헌 신청

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