Hydrogen-assisted crack propagation in 304L/308L and 21Cr-6Ni-9Mn/308L austenitic stainless steel fusion welds

被引：52

作者：

Jackson, H. F. ^{[1
]}

Nibur, K. A. ^{[2
]}

Marchi, C. San ^{[1
]}

Puskar, J. D. ^{[3
]}

Somerday, B. P. ^{[1
]}

机构：

[1] Sandia Natl Labs, Livermore, CA 94550 USA

[2] Hyperformance Mat Testing, Bend, OR 97701 USA

[3] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

CORROSION SCIENCE | 2012年 / 60卷

关键词：

Stainless steel; SEM; Hydrogen embrittlement; STACKING-FAULT ENERGY; PLASTIC-DEFORMATION; FRACTURE; EMBRITTLEMENT; TRANSPORT; SUSCEPTIBILITY; MARTENSITE; LOCALIZATION; PERMEATION; MECHANISM;

D O I：

10.1016/j.corsci.2012.03.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Elastic-plastic fracture mechanics methods were used to characterize hydrogen-assisted crack propagation in two austenitic stainless steel gas tungsten arc (GTA) welds. Thermally precharged hydrogen (140 wppm) degraded fracture initiation toughness and crack growth toughness and altered fracture mechanisms. Fracture initiation toughness in hydrogen-precharged welds represented a reduction of >67% from the estimated toughness of non-charged welds. In hydrogen-precharged welds, microcracks initiated at ferrite, and dendritic microstructure promoted crack propagation along ferrite. Deformation twinning in austenite interacts with ferrite, facilitating microcrack formation. While hydrogen altered fracture mechanisms similarly for both welds, the amount of ferrite governed the severity of hydrogen-assisted crack propagation. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：136 / 144

页数：9

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