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

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 prop...

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Auteurs principaux:	Xingdong Peng, Peng Zhang, Ke Hu, Ling Yan, Guanglong Li
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	offshore structural steel TMCP EH36 mechanical properties Mining engineering. Metallurgy TN1-997
Accès en ligne:	https://doaj.org/article/f58e0a1b07d24ec2bb7b42fb486c1d63
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spelling	oai:doaj.org-article:f58e0a1b07d24ec2bb7b42fb486c1d632021-11-25T18:22:37ZSimultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying10.3390/met111118802075-4701https://doaj.org/article/f58e0a1b07d24ec2bb7b42fb486c1d632021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1880https://doaj.org/toc/2075-4701Improving 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.Xingdong PengPeng ZhangKe HuLing YanGuanglong LiMDPI AGarticleoffshore structural steelTMCPEH36mechanical propertiesMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1880, p 1880 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	offshore structural steel TMCP EH36 mechanical properties Mining engineering. Metallurgy TN1-997
spellingShingle	offshore structural steel TMCP EH36 mechanical properties Mining engineering. Metallurgy TN1-997 Xingdong Peng Peng Zhang Ke Hu Ling Yan Guanglong Li Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
description	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.
format	article
author	Xingdong Peng Peng Zhang Ke Hu Ling Yan Guanglong Li
author_facet	Xingdong Peng Peng Zhang Ke Hu Ling Yan Guanglong Li
author_sort	Xingdong Peng
title	Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
title_short	Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
title_full	Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
title_fullStr	Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
title_full_unstemmed	Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
title_sort	simultaneous improvement in mechanical properties and fatigue crack propagation resistance of low carbon offshore structural steel eh36 by cu–cr microalloying
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f58e0a1b07d24ec2bb7b42fb486c1d63
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_version_	1718411295524388864

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

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