Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment

The effect of δ-ferrite on the stress corrosion cracking (SCC) of CF8A austenitic stainless steels in a simulated pressurised water reactor environment is investigated from the viewpoint of oxidation. In constant-displacement tensile tests, a large number of entangled dislocations are formed in δ-fe...

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Main Authors:	Youwei Xu, Hongyang Jing, Lianyong Xu, Yongdian Han, Lei Zhao
Format:	Article
Language:	English
Published:	Elsevier 2019-11-01
Series:	Journal of Materials Research and Technology
Online Access:	http://www.sciencedirect.com/science/article/pii/S2238785419310634

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spelling	doaj-8a886b95f1b24731a4db4caf7f6e4bc92020-11-25T03:42:10ZengElsevierJournal of Materials Research and Technology2238-78542019-11-018664206426Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environmentYouwei Xu0Hongyang Jing1Lianyong Xu2Yongdian Han3Lei Zhao4School of Materials Science and Engineering, Tianjin University, Tianjin 300050, PR China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300050, PR ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin 300050, PR China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300050, PR ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin 300050, PR China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300050, PR China; State Key Laboratory of Engines, Tianjin University, Tianjin 300050, PR China; Corresponding author.School of Materials Science and Engineering, Tianjin University, Tianjin 300050, PR China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300050, PR ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin 300050, PR China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300050, PR ChinaThe effect of δ-ferrite on the stress corrosion cracking (SCC) of CF8A austenitic stainless steels in a simulated pressurised water reactor environment is investigated from the viewpoint of oxidation. In constant-displacement tensile tests, a large number of entangled dislocations are formed in δ-ferrite due to the incompatibility of the slip system between the austenite and δ-ferrite. The activity of the metal atoms in dislocation-entangled nodules is much higher than that in other regions. Therefore, many Fe and Ni atoms break through the barrier of the inner Cr2O3 oxide films and diffuse to react with the Cr2O3 to form non-stoichiometric (Ni,Fe)(Fe,Cr)2O4 spinel-structure oxides, and denser outer Fe3O4 granular oxides. In addition, δ-ferrite–austenite grain boundaries are oxidised preferentially due to the accumulation of a high level of interfacial energy and plastic damage. However, SCC retardation is clearly observed because the presence of δ-ferrite changes the direction of SCC propagation and increases the length of the SCC propagation pathways. Keywords: Austenitic stainless steel, δ-ferrite, Oxidation, Stress corrosion crackinghttp://www.sciencedirect.com/science/article/pii/S2238785419310634
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Youwei Xu Hongyang Jing Lianyong Xu Yongdian Han Lei Zhao
spellingShingle	Youwei Xu Hongyang Jing Lianyong Xu Yongdian Han Lei Zhao Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment Journal of Materials Research and Technology
author_facet	Youwei Xu Hongyang Jing Lianyong Xu Yongdian Han Lei Zhao
author_sort	Youwei Xu
title	Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment
title_short	Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment
title_full	Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment
title_fullStr	Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment
title_full_unstemmed	Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment
title_sort	effect of δ-ferrite on stress corrosion cracking of cf8a austenitic stainless steels in a simulated pressurised water reactor environment
publisher	Elsevier
series	Journal of Materials Research and Technology
issn	2238-7854
publishDate	2019-11-01
description	The effect of δ-ferrite on the stress corrosion cracking (SCC) of CF8A austenitic stainless steels in a simulated pressurised water reactor environment is investigated from the viewpoint of oxidation. In constant-displacement tensile tests, a large number of entangled dislocations are formed in δ-ferrite due to the incompatibility of the slip system between the austenite and δ-ferrite. The activity of the metal atoms in dislocation-entangled nodules is much higher than that in other regions. Therefore, many Fe and Ni atoms break through the barrier of the inner Cr2O3 oxide films and diffuse to react with the Cr2O3 to form non-stoichiometric (Ni,Fe)(Fe,Cr)2O4 spinel-structure oxides, and denser outer Fe3O4 granular oxides. In addition, δ-ferrite–austenite grain boundaries are oxidised preferentially due to the accumulation of a high level of interfacial energy and plastic damage. However, SCC retardation is clearly observed because the presence of δ-ferrite changes the direction of SCC propagation and increases the length of the SCC propagation pathways. Keywords: Austenitic stainless steel, δ-ferrite, Oxidation, Stress corrosion cracking
url	http://www.sciencedirect.com/science/article/pii/S2238785419310634
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Effect of δ-ferrite on stress corrosion cracking of CF8A austenitic stainless steels in a simulated pressurised water reactor environment

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