Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

Dazheng Zhang; Xiuhua Gao; Mingming Wang; Weijuan Li; Jing Guo; Yingxue Teng; Wanshun Zhang

doi:10.1088/2053-1591/ac7f12

Materials Research Express (Jan 2022)

Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

Dazheng Zhang,
Xiuhua Gao,
Mingming Wang,
Weijuan Li,
Jing Guo,
Yingxue Teng,
Wanshun Zhang

Affiliations

Dazheng Zhang: School of Materials and Metallurgy, University of Science and Technology Liaoning , Anshan 114051, People’s Republic of China
Xiuhua Gao: ORCiD; State Key Laboratory of Rolling and Automation, Northeastern University , Shenyang 110819, People’s Republic of China
Mingming Wang: State Key Laboratory of Rolling and Automation, Northeastern University , Shenyang 110819, People’s Republic of China
Weijuan Li: School of Materials and Metallurgy, University of Science and Technology Liaoning , Anshan 114051, People’s Republic of China
Jing Guo: School of Materials and Metallurgy, University of Science and Technology Liaoning , Anshan 114051, People’s Republic of China
Yingxue Teng: School of Materials and Metallurgy, University of Science and Technology Liaoning , Anshan 114051, People’s Republic of China
Wanshun Zhang: School of Materials and Metallurgy, University of Science and Technology Liaoning , Anshan 114051, People’s Republic of China

DOI: https://doi.org/10.1088/2053-1591/ac7f12
Journal volume & issue: Vol. 9, no. 7
p. 076507

Abstract

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The relationship between microstructure, stress ratio, and fatigue fracture behavior of high-strength steel for flexible marine risers was investigated by microstructure characterization and fatigue test. The microstructure characteristic, S-N curve, fatigue fracture morphology, and fatigue crack morphology after quenching and tempering treatment and cyclic heat treatment, respectively, were evaluated. The results revealed that after cyclic heat treatment, the microstructure was refined considerably, the grain boundary density and the content of high-angle grain boundary increased, which inhibited the fatigue crack propagation and improved the fatigue strength. The average stress increased by increasing the stress ratio, which promoted the crack initiation and propagation; consequently, the fatigue strength and fatigue life of the tested steel decreased.

Published in Materials Research Express

ISSN: 2053-1591 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Technology: Chemical technology
Website: https://iopscience.iop.org/journal/2053-1591

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