Degradation models for hydrogen embrittlement

M. Dadfarnia; P. Sofronis; B. P. Somerday; D. K. Balch; P. Schembri

doi:10.1016/B978-0-85709-536-7.50011-8

Degradation models for hydrogen embrittlement

M. Dadfarnia, P. Sofronis, B. P. Somerday, D. K. Balch, P. Schembri

Research output: Chapter in Book/Report/Conference proceeding › Chapter

Abstract

In this chapter, we present a solid mechanics modeling and simulation effort to elucidate the linking of the macroscopic embrittlement phenomenology to the features of the microstructural degradation mechanisms ahead of a crack tip in the austenitic Fe-Ni-Co alloy IN903. In general, we find that the deformation and hydrogen fields in the fracture process depend strongly on the initial and boundary conditions, thus reflecting the variety of fracture modes. In particular, for intergranular crack growth in wedge opening load specimens in hydrogen gas we predict fracture process zones that are large in comparison to the typical characteristic diffusion distances. For ductile cracking in gaseous environments, we find that the process is controlled by the average spacing of the carbides.

Original language	English (US)
Title of host publication	Gaseous Hydrogen Embrittlement of Materials in Energy Technologies
Subtitle of host publication	Mechanisms, Modelling and Future Developments
Publisher	Elsevier Inc.
Pages	326-377
Number of pages	52
ISBN (Print)	9780857095367
DOIs	https://doi.org/10.1016/B978-0-85709-536-7.50011-8
State	Published - Jan 2012

Keywords

Ductile fracture
Grain boundary decohesion
Hydrogen embrittlement
Intergranular cracking
Subcritical cracking
Void growth

ASJC Scopus subject areas

General Engineering

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10.1016/B978-0-85709-536-7.50011-8

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title = "Degradation models for hydrogen embrittlement",

abstract = "In this chapter, we present a solid mechanics modeling and simulation effort to elucidate the linking of the macroscopic embrittlement phenomenology to the features of the microstructural degradation mechanisms ahead of a crack tip in the austenitic Fe-Ni-Co alloy IN903. In general, we find that the deformation and hydrogen fields in the fracture process depend strongly on the initial and boundary conditions, thus reflecting the variety of fracture modes. In particular, for intergranular crack growth in wedge opening load specimens in hydrogen gas we predict fracture process zones that are large in comparison to the typical characteristic diffusion distances. For ductile cracking in gaseous environments, we find that the process is controlled by the average spacing of the carbides.",

keywords = "Ductile fracture, Grain boundary decohesion, Hydrogen embrittlement, Intergranular cracking, Subcritical cracking, Void growth",

author = "M. Dadfarnia and P. Sofronis and Somerday, {B. P.} and Balch, {D. K.} and P. Schembri",

note = "Funding Information: The authors gratefully acknowledge support from the Los Alamos National Laboratory under US Department of Energy Contract No. LANL 62568-00108 and from the US Department of Energy under Grant G015045.",

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T1 - Degradation models for hydrogen embrittlement

AU - Dadfarnia, M.

AU - Sofronis, P.

AU - Somerday, B. P.

AU - Balch, D. K.

AU - Schembri, P.

N1 - Funding Information: The authors gratefully acknowledge support from the Los Alamos National Laboratory under US Department of Energy Contract No. LANL 62568-00108 and from the US Department of Energy under Grant G015045.

PY - 2012/1

Y1 - 2012/1

N2 - In this chapter, we present a solid mechanics modeling and simulation effort to elucidate the linking of the macroscopic embrittlement phenomenology to the features of the microstructural degradation mechanisms ahead of a crack tip in the austenitic Fe-Ni-Co alloy IN903. In general, we find that the deformation and hydrogen fields in the fracture process depend strongly on the initial and boundary conditions, thus reflecting the variety of fracture modes. In particular, for intergranular crack growth in wedge opening load specimens in hydrogen gas we predict fracture process zones that are large in comparison to the typical characteristic diffusion distances. For ductile cracking in gaseous environments, we find that the process is controlled by the average spacing of the carbides.

AB - In this chapter, we present a solid mechanics modeling and simulation effort to elucidate the linking of the macroscopic embrittlement phenomenology to the features of the microstructural degradation mechanisms ahead of a crack tip in the austenitic Fe-Ni-Co alloy IN903. In general, we find that the deformation and hydrogen fields in the fracture process depend strongly on the initial and boundary conditions, thus reflecting the variety of fracture modes. In particular, for intergranular crack growth in wedge opening load specimens in hydrogen gas we predict fracture process zones that are large in comparison to the typical characteristic diffusion distances. For ductile cracking in gaseous environments, we find that the process is controlled by the average spacing of the carbides.

KW - Ductile fracture

KW - Grain boundary decohesion

KW - Hydrogen embrittlement

KW - Intergranular cracking

KW - Subcritical cracking

KW - Void growth

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M3 - Chapter

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SN - 9780857095367

SP - 326

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BT - Gaseous Hydrogen Embrittlement of Materials in Energy Technologies

PB - Elsevier Inc.

ER -

Degradation models for hydrogen embrittlement

Abstract

Keywords

ASJC Scopus subject areas

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