Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition

Fire–resistant properties of Mo-/Nb-added structural steels were evaluated using hot tension tests and constant-load tests. Hot tension tests showed that an increase in the Mo and Nb contents led to a slow decrease in the strength as the holding time increased at a high temperature (600 °C), enhanci...

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Autores principales:	Joonoh Moon, Sung-Dae Kim, Chang-Hoon Lee, Hyo-Haeng Jo, Hyun-Uk Hong, Jun-Ho Chung, Bong Ho Lee
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Fire-resistant steel Constant-load test High-temperature strength Dislocation annihilation Strengthening mechanism Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/fe38781d6ad141b7a75ae89bbcc3f194
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spelling	oai:doaj.org-article:fe38781d6ad141b7a75ae89bbcc3f1942021-11-12T04:36:00ZStrengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition2238-785410.1016/j.jmrt.2021.10.132https://doaj.org/article/fe38781d6ad141b7a75ae89bbcc3f1942021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421012692https://doaj.org/toc/2238-7854Fire–resistant properties of Mo-/Nb-added structural steels were evaluated using hot tension tests and constant-load tests. Hot tension tests showed that an increase in the Mo and Nb contents led to a slow decrease in the strength as the holding time increased at a high temperature (600 °C), enhancing the fire resistance. Transmission electron microscopy (TEM) and atom probe tomography analyses revealed that this improved fire resistance stemmed from the annihilation of dislocations at high temperatures, which was suppressed by the solid solution of Mo atoms and fine precipitation of Ti/Nb-enriched MC carbides. Meanwhile, an increase in Ti content decreased fire resistance via precipitation of coarse TiC particles, i.e., in-situ TEM observations showed that dislocations moved easily along the surface of coarse particles by climb, indicating that coarse particles did not play a role in disturbing dislocation movement during deformation at high temperatures. Next, constant-load tests were carried out with a constant load of 50% of the yield strength, while the temperature was increased linearly until failure. The results were in good agreement with the results of the hot tension tests; i.e., the failure temperature increased with an increase in the Mo and Nb contents, indicating improvement in fire resistance.Joonoh MoonSung-Dae KimChang-Hoon LeeHyo-Haeng JoHyun-Uk HongJun-Ho ChungBong Ho LeeElsevierarticleFire-resistant steelConstant-load testHigh-temperature strengthDislocation annihilationStrengthening mechanismMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5095-5105 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fire-resistant steel Constant-load test High-temperature strength Dislocation annihilation Strengthening mechanism Mining engineering. Metallurgy TN1-997
spellingShingle	Fire-resistant steel Constant-load test High-temperature strength Dislocation annihilation Strengthening mechanism Mining engineering. Metallurgy TN1-997 Joonoh Moon Sung-Dae Kim Chang-Hoon Lee Hyo-Haeng Jo Hyun-Uk Hong Jun-Ho Chung Bong Ho Lee Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
description	Fire–resistant properties of Mo-/Nb-added structural steels were evaluated using hot tension tests and constant-load tests. Hot tension tests showed that an increase in the Mo and Nb contents led to a slow decrease in the strength as the holding time increased at a high temperature (600 °C), enhancing the fire resistance. Transmission electron microscopy (TEM) and atom probe tomography analyses revealed that this improved fire resistance stemmed from the annihilation of dislocations at high temperatures, which was suppressed by the solid solution of Mo atoms and fine precipitation of Ti/Nb-enriched MC carbides. Meanwhile, an increase in Ti content decreased fire resistance via precipitation of coarse TiC particles, i.e., in-situ TEM observations showed that dislocations moved easily along the surface of coarse particles by climb, indicating that coarse particles did not play a role in disturbing dislocation movement during deformation at high temperatures. Next, constant-load tests were carried out with a constant load of 50% of the yield strength, while the temperature was increased linearly until failure. The results were in good agreement with the results of the hot tension tests; i.e., the failure temperature increased with an increase in the Mo and Nb contents, indicating improvement in fire resistance.
format	article
author	Joonoh Moon Sung-Dae Kim Chang-Hoon Lee Hyo-Haeng Jo Hyun-Uk Hong Jun-Ho Chung Bong Ho Lee
author_facet	Joonoh Moon Sung-Dae Kim Chang-Hoon Lee Hyo-Haeng Jo Hyun-Uk Hong Jun-Ho Chung Bong Ho Lee
author_sort	Joonoh Moon
title	Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
title_short	Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
title_full	Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
title_fullStr	Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
title_full_unstemmed	Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition
title_sort	strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of mo and nb addition
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/fe38781d6ad141b7a75ae89bbcc3f194
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Strengthening mechanisms of solid solution and precipitation at elevated temperature in fire-resistant steels and the effects of Mo and Nb addition

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