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Article

Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying

by 1,2, 2,*, 1,*, 2 and 2
1
School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
2
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114001, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Alexander Ivanovich Zaitsev
Metals 2021, 11(11), 1880; https://doi.org/10.3390/met11111880
Received: 12 October 2021 / Revised: 17 November 2021 / Accepted: 17 November 2021 / Published: 22 November 2021
Improving the mechanical performance of low-carbon offshore steel is of great significance in shipbuilding applications. In this paper, a new Cu-Cr microalloyed offshore structural steel (FH36) was developed based on EH36. The microstructure, mechanical properties, and fatigue crack propagation properties of rolled plates of FH36, EH36, and normalizing rolled EH36 plates (EH36N) manufactured by a thermo-mechanical control process (TMCP) were analyzed and compared (to simplify, the two rolled specimens are signified by FH36T and EH36T, respectively). FH36T showed an obvious advantage in elongation with the value of 29%, 52.2% higher than the EH36T plates. The normalizing process led to a relatively lower yield stress (338 MPa), but substantially increased the elongation (33%) and lessened the yield ratio from 0.77 to 0.67. Electron back-scattered diffraction (EBSD) analysis showed that SFs of the deformation texture of FH36T and EH36N along the transverse direction (TD) and normal direction (ND) were much higher than those of the EH36T plate, which enhanced the lateral movement ability in the width and thickness direction, enhancing the ductility. Moreover, FH36 plates showed a better fatigue crack propagation resistance than rolled EH36 plates. The formation of the jagged shape grain boundaries is believed to induce a decrease of effective stress intensity factor during the fatigue crack propagation process. View Full-Text
Keywords: offshore structural steel; TMCP; EH36; mechanical properties offshore structural steel; TMCP; EH36; mechanical properties
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MDPI and ACS Style

Peng, X.; Zhang, P.; Hu, K.; Yan, L.; Li, G. Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying. Metals 2021, 11, 1880. https://doi.org/10.3390/met11111880

AMA Style

Peng X, Zhang P, Hu K, Yan L, Li G. Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying. Metals. 2021; 11(11):1880. https://doi.org/10.3390/met11111880

Chicago/Turabian Style

Peng, Xingdong, Peng Zhang, Ke Hu, Ling Yan, and Guanglong Li. 2021. "Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying" Metals 11, no. 11: 1880. https://doi.org/10.3390/met11111880

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