The role of reversed austenite in hydrogen embrittlement fracture of S41500 martensitic stainless steel

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	The role of reversed austenite in hydrogen embrittlement fracture of S41500 martensitic stainless steel
	Fan, Y. H.; Zhang, B.; Yi, H. L.; Hao, G. S.; Sun, Y. Y.; Wang, J. Q.; Han, E. -H.; Ke, W.; Zhang, B (reprint author), 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China.
刊名	PERGAMON-ELSEVIER SCIENCE LTD
	2017-10-15
卷号	139 页码:188-195
关键词	Reversed Austenite Hydrogen Embrittlement 3dap Fib Tem
ISSN号	1359-6454
英文摘要	Up to now, the precise role of reversed austenite (RA) in hydrogen embrittlement (HE) of steel is still not fully understood. This work presents new observations and interpretation of fracture surface features immediately beneath the fracture surface for 541500 martensitic stainless steels (MSS) with aim to reveal the role of RA in HE resistance. The MSS were tensile tested with slow strain rate under electrochemical hydrogen charging condition. Steel containing more RA was found to have less hydrogen embrittlement susceptibility. Focused ion beam (FIB) was used to prepare sample for TEM observation of fracture path after HE fracture. It clearly shows that RA near the fracture surface has transformed to the newly formed martensite (NFM) and cracking occurs along both the tempered martensite/NFM boundaries and the lath boundaries. Three dimension atom probe (3DAP) confirms that RA is the H trapping site. Thus the beneficial role of RA is that it can act as a stable hydrogen trapping site which can increase the HE resistance by reducing hydrogen content at lath and grain boundaries. But its beneficial effect should not be overestimated since cracking along tempered martensite/NFM boundaries can occur after martensitic transformation as a result of hydrogen redistribution. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Up to now, the precise role of reversed austenite (RA) in hydrogen embrittlement (HE) of steel is still not fully understood. This work presents new observations and interpretation of fracture surface features immediately beneath the fracture surface for 541500 martensitic stainless steels (MSS) with aim to reveal the role of RA in HE resistance. The MSS were tensile tested with slow strain rate under electrochemical hydrogen charging condition. Steel containing more RA was found to have less hydrogen embrittlement susceptibility. Focused ion beam (FIB) was used to prepare sample for TEM observation of fracture path after HE fracture. It clearly shows that RA near the fracture surface has transformed to the newly formed martensite (NFM) and cracking occurs along both the tempered martensite/NFM boundaries and the lath boundaries. Three dimension atom probe (3DAP) confirms that RA is the H trapping site. Thus the beneficial role of RA is that it can act as a stable hydrogen trapping site which can increase the HE resistance by reducing hydrogen content at lath and grain boundaries. But its beneficial effect should not be overestimated since cracking along tempered martensite/NFM boundaries can occur after martensitic transformation as a result of hydrogen redistribution. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [U1608257]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79043]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, B (reprint author), 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Fan, Y. H.,Zhang, B.,Yi, H. L.,et al. The role of reversed austenite in hydrogen embrittlement fracture of S41500 martensitic stainless steel[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,139:188-195.
APA	Fan, Y. H..,Zhang, B..,Yi, H. L..,Hao, G. S..,Sun, Y. Y..,...&Zhang, B .(2017).The role of reversed austenite in hydrogen embrittlement fracture of S41500 martensitic stainless steel.PERGAMON-ELSEVIER SCIENCE LTD,139,188-195.
MLA	Fan, Y. H.,et al."The role of reversed austenite in hydrogen embrittlement fracture of S41500 martensitic stainless steel".PERGAMON-ELSEVIER SCIENCE LTD 139(2017):188-195.