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

被引：117
作者：
Fan, Y. H. [1 ,2 ]
Zhang, B. [1 ]
Yi, H. L. [3 ]
Hao, G. S. [3 ]
Sun, Y. Y. [3 ]
Wang, J. Q. [1 ]
Han, E. -H. [1 ]
Ke, W. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
[3] Shenyang Blower Works Grp Corp, Shenyang 110869, Liaoning, Peoples R China
来源：
ACTA MATERIALIA | 2017年 / 139卷
基金：
中国国家自然科学基金;
关键词：
Reversed austenite; Hydrogen embrittlement; 3DAP; FIB; TEM; HIGH-STRENGTH STEEL; ENVIRONMENTALLY ASSISTED CRACKING; STACKING-FAULT ENERGY; RETAINED AUSTENITE; LATH MARTENSITE; TRAPPING SITES; INTERGRANULAR FRACTURE; FERRITIC STEEL; HEAT-TREATMENT; MICROSTRUCTURE;
D O I：
10.1016/j.actamat.2017.08.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
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.
引用
收藏
页码：188 / 195
页数：8
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