Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel

The influence of inclusion size and number density on high-temperature urea corrosion (HTUC) behavior of ferritic stainless steels was investigated in a simulated working environment of selective catalytic reduction (SCR) system in commercial vehicles. There is a positive correlation between the con...

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Autores principales:	Xuelin Wang, Qingsong Lu, Wei Zhang, Zhenjia Xie, Chengjia Shang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ferritic stainless steel corrosion inclusion Cr-rich precipitates interfaces Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/f75e79bbade54423a169e03dd214b392
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spelling	oai:doaj.org-article:f75e79bbade54423a169e03dd214b3922021-11-25T18:22:13ZInvestigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel10.3390/met111118232075-4701https://doaj.org/article/f75e79bbade54423a169e03dd214b3922021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1823https://doaj.org/toc/2075-4701The influence of inclusion size and number density on high-temperature urea corrosion (HTUC) behavior of ferritic stainless steels was investigated in a simulated working environment of selective catalytic reduction (SCR) system in commercial vehicles. There is a positive correlation between the control level of inclusions and the resistance of HTUC. By slightly increasing the content of Nb in ferritic stainless steels, the inclusions, especially TiN, were significantly refined, and thus displayed an improvement in HTUC resistance. The interface between inclusions and the matrix becomes a fast channel for chromium precipitation during high-temperature nitriding induced by the decomposition of urea. Chromium nitrides will precipitate around the inclusions and wrap the inclusions, which will decrease the chromium equivalent of the matrix and reduce the resistance of ferritic stainless steels to HTUC. In addition, the high-temperature oxidation accompanied with thermal fatigue also makes the inclusions more likely to become the crack nucleation source, which can accelerate the material thinning and reduce its service life.Xuelin WangQingsong LuWei ZhangZhenjia XieChengjia ShangMDPI AGarticleferritic stainless steelcorrosioninclusionCr-rich precipitatesinterfacesMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1823, p 1823 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ferritic stainless steel corrosion inclusion Cr-rich precipitates interfaces Mining engineering. Metallurgy TN1-997
spellingShingle	ferritic stainless steel corrosion inclusion Cr-rich precipitates interfaces Mining engineering. Metallurgy TN1-997 Xuelin Wang Qingsong Lu Wei Zhang Zhenjia Xie Chengjia Shang Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
description	The influence of inclusion size and number density on high-temperature urea corrosion (HTUC) behavior of ferritic stainless steels was investigated in a simulated working environment of selective catalytic reduction (SCR) system in commercial vehicles. There is a positive correlation between the control level of inclusions and the resistance of HTUC. By slightly increasing the content of Nb in ferritic stainless steels, the inclusions, especially TiN, were significantly refined, and thus displayed an improvement in HTUC resistance. The interface between inclusions and the matrix becomes a fast channel for chromium precipitation during high-temperature nitriding induced by the decomposition of urea. Chromium nitrides will precipitate around the inclusions and wrap the inclusions, which will decrease the chromium equivalent of the matrix and reduce the resistance of ferritic stainless steels to HTUC. In addition, the high-temperature oxidation accompanied with thermal fatigue also makes the inclusions more likely to become the crack nucleation source, which can accelerate the material thinning and reduce its service life.
format	article
author	Xuelin Wang Qingsong Lu Wei Zhang Zhenjia Xie Chengjia Shang
author_facet	Xuelin Wang Qingsong Lu Wei Zhang Zhenjia Xie Chengjia Shang
author_sort	Xuelin Wang
title	Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
title_short	Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
title_full	Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
title_fullStr	Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
title_full_unstemmed	Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
title_sort	investigation on the correlation between inclusions and high temperature urea corrosion behavior in ferritic stainless steel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f75e79bbade54423a169e03dd214b392
work_keys_str_mv	AT xuelinwang investigationonthecorrelationbetweeninclusionsandhightemperatureureacorrosionbehaviorinferriticstainlesssteel AT qingsonglu investigationonthecorrelationbetweeninclusionsandhightemperatureureacorrosionbehaviorinferriticstainlesssteel AT weizhang investigationonthecorrelationbetweeninclusionsandhightemperatureureacorrosionbehaviorinferriticstainlesssteel AT zhenjiaxie investigationonthecorrelationbetweeninclusionsandhightemperatureureacorrosionbehaviorinferriticstainlesssteel AT chengjiashang investigationonthecorrelationbetweeninclusionsandhightemperatureureacorrosionbehaviorinferriticstainlesssteel
_version_	1718411296550944768

Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel

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