Effect of low temperature on hydrogen-assisted crack propagation in 304L/308L austenitic stainless steel fusion welds

[Display omitted] •Measured crack growth resistance of welds at 223K with 140wppm H (gas charged).•H reduced fracture initiation toughness by >59% and altered fracture mode.•223K altered fracture mode but had no effect on JIC of precharged welds.•At 293K, microcracks initiate at δ-ferrite, and fe...

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Bibliographic Details
Published in:Corrosion science 2013-12, Vol.77, p.210-221
Main Authors: Jackson, H.F., San Marchi, C., Balch, D.K., Somerday, B.P.
Format: Article
Language:English
Subjects:
A. Stainless steel
Applied sciences
Austenite
Austenitic stainless steels
B. SEM
C. Hydrogen embrittlement
Corrosion
Corrosion environments
Crack initiation
Crack propagation
Deformation
Exact sciences and technology
Fracture mechanics
Fractures
Fusion welding
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Phase boundaries
Welding
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Summary:[Display omitted] •Measured crack growth resistance of welds at 223K with 140wppm H (gas charged).•H reduced fracture initiation toughness by >59% and altered fracture mode.•223K altered fracture mode but had no effect on JIC of precharged welds.•At 293K, microcracks initiate at δ-ferrite, and ferrite governed crack path.•At 223K, microvoids form at γ deformation band intersections near phase boundaries. Effects of low temperature on hydrogen-assisted cracking in 304L/308L austenitic stainless steel welds were investigated using elastic–plastic fracture mechanics methods. Thermally precharged hydrogen (140wppm) decreased fracture toughness and altered fracture mechanisms at 293 and 223K relative to hydrogen-free welds. At 293K, hydrogen increased planar deformation in austenite, and microcracking of δ-ferrite governed crack paths. At 223K, low temperature enabled hydrogen to exacerbate localized deformation, and microvoid formation, at austenite deformation band intersections near phase boundaries, dominated damage initiation; microcracking of ferrite did not contribute to crack growth.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2013.08.004