The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel

Nb-V-Ti-Mo complex microalloyed high-strength fire-resistant steel was obtained through two-stage hot rolling and laminar cooling. The results showed that the microstructure of the steel included bainite ferrite and martensite-austenite constituent (i.e., MA) islands. The experimental steel displaye...

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Autores principales:	Xin Wang, Zhaodong Li, Shitong Zhou, Runnong Chen, Guangjie Da, Qilong Yong, Zhongmin Yang, Junchang Shen, Chengjia Shang, Qingyou Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	high-temperature property elastic modulus precipitation strengthening work hardening behavior Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/478ddfda7ece49b4ac1a02ab2563eb4a
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spelling	oai:doaj.org-article:478ddfda7ece49b4ac1a02ab2563eb4a2021-11-25T18:21:05ZThe Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel10.3390/met111116702075-4701https://doaj.org/article/478ddfda7ece49b4ac1a02ab2563eb4a2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1670https://doaj.org/toc/2075-4701Nb-V-Ti-Mo complex microalloyed high-strength fire-resistant steel was obtained through two-stage hot rolling and laminar cooling. The results showed that the microstructure of the steel included bainite ferrite and martensite-austenite constituent (i.e., MA) islands. The experimental steel displayed high strength at room temperature, with a yield strength (<i>YS</i>) of 617 MPa and tensile strength of 813 MPa (elongation = 18.5%). As the temperature increased to 700 °C, the high-temperature yield strength gradually decreased. Electron backscatter diffraction (EBSD) was used to analyze the experimental steels at different temperatures. The grain sizes did not grow significantly. A small number of nanoprecipitates with an average diameter of 29.2 nm were distributed in the matrix of the as-rolled specimen. Upon increasing the temperature, the number of fine nanoprecipitates gradually increased, resulting in a gradual decrease in their average diameter, reaching a minimum of 19.4 nm at 600 °C. The Orowan equation explained well the precipitation strengthening effect of the nanoprecipitates that formed at a high temperature. At both room temperature and 300 °C, the Ashby work hardening theoretical curves were consistent with the experimental true stress-strain curves. Dynamic recovery and recrystallization occurred at 600 °C, which caused the experimental true stress-strain curve to deviate from the calculated curve.Xin WangZhaodong LiShitong ZhouRunnong ChenGuangjie DaQilong YongZhongmin YangJunchang ShenChengjia ShangQingyou LiuMDPI AGarticlehigh-temperature propertyelastic modulusprecipitation strengtheningwork hardening behaviorMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1670, p 1670 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	high-temperature property elastic modulus precipitation strengthening work hardening behavior Mining engineering. Metallurgy TN1-997
spellingShingle	high-temperature property elastic modulus precipitation strengthening work hardening behavior Mining engineering. Metallurgy TN1-997 Xin Wang Zhaodong Li Shitong Zhou Runnong Chen Guangjie Da Qilong Yong Zhongmin Yang Junchang Shen Chengjia Shang Qingyou Liu The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
description	Nb-V-Ti-Mo complex microalloyed high-strength fire-resistant steel was obtained through two-stage hot rolling and laminar cooling. The results showed that the microstructure of the steel included bainite ferrite and martensite-austenite constituent (i.e., MA) islands. The experimental steel displayed high strength at room temperature, with a yield strength (<i>YS</i>) of 617 MPa and tensile strength of 813 MPa (elongation = 18.5%). As the temperature increased to 700 °C, the high-temperature yield strength gradually decreased. Electron backscatter diffraction (EBSD) was used to analyze the experimental steels at different temperatures. The grain sizes did not grow significantly. A small number of nanoprecipitates with an average diameter of 29.2 nm were distributed in the matrix of the as-rolled specimen. Upon increasing the temperature, the number of fine nanoprecipitates gradually increased, resulting in a gradual decrease in their average diameter, reaching a minimum of 19.4 nm at 600 °C. The Orowan equation explained well the precipitation strengthening effect of the nanoprecipitates that formed at a high temperature. At both room temperature and 300 °C, the Ashby work hardening theoretical curves were consistent with the experimental true stress-strain curves. Dynamic recovery and recrystallization occurred at 600 °C, which caused the experimental true stress-strain curve to deviate from the calculated curve.
format	article
author	Xin Wang Zhaodong Li Shitong Zhou Runnong Chen Guangjie Da Qilong Yong Zhongmin Yang Junchang Shen Chengjia Shang Qingyou Liu
author_facet	Xin Wang Zhaodong Li Shitong Zhou Runnong Chen Guangjie Da Qilong Yong Zhongmin Yang Junchang Shen Chengjia Shang Qingyou Liu
author_sort	Xin Wang
title	The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
title_short	The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
title_full	The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
title_fullStr	The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
title_full_unstemmed	The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
title_sort	influence of temperature on the microstructure and properties of nb-v-ti-mo complex microalloyed high-strength fire-resistant steel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/478ddfda7ece49b4ac1a02ab2563eb4a
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The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel

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