Microscopic Mechanism of Hydrogen Embrittlement in Fatigue and Fracture

Yukitaka Murakami; Junichiro Yamabe; Hisao Matsunaga

doi:10.4028/www.scientific.net/KEM.592-593.3

Paper Titles

Preface

Microscopic Mechanism of Hydrogen Embrittlement in Fatigue and Fracture
p.3

3D Studies of Indentation by Combined X-Ray Tomography and Digital Volume Correlation
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Influence of Microstructure, Environment and Temperature on Fatigue Crack Propagation in 2XXX Aluminium Alloys
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Analysis of Fatigue Damage Accumulation in TiAl Intermetallics
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Atomistic Model Analysis of Local and Global Instabilities in Crystals at Finite Temperature
p.39

Stress Analysis of Highly Constrained Copper Strips with through Crack Shaped Voids Using Molecular Dynamics
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Dynamic Stability of Ni FCC Crystal under Isotropic Tension
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Structural Transformation in Nanowires CuAu I with Superstructure of L10 of Tetragonal Symmetry at Uni-Axial Tension Deformation
p.51

HomeKey Engineering MaterialsKey Engineering Materials Vols. 592-593Microscopic Mechanism of Hydrogen Embrittlement in...

Microscopic Mechanism of Hydrogen Embrittlement in Fatigue and Fracture

Abstract:

The microscope mechanism of hydrogen embrittlement (HE) is overviewed from the viewpoint of Mechanics-Microstructure-Environment Interactions. The plastic deformation (Mechanics) at crack tip for low strength steel is controlled by hydrogen concentration (Environment) to crack tip, eventually resulting in very strong time dependent phenomenon in static fracture and fatigue crack growth. Various typical phenomena in low strength steels which can be understood from the viewpoint of Mechanics-Environment Interactions will be presented. Fracture and fatigue of high strength steels (Microstructure) are strongly influenced by hydrogen. Especially, fatigue crack growth is remarkably accelerated by hydrogen-induced deformation twins. The HE phenomemon of the high-strength steels was applied to a newly inclusion rating method. Hydrogen trapped by nonmetalliec inclusions causes the elimination of fatigue limit at very high cycle fatigue. The values of threshold stress intensity factor K_TH in hydrogen for small cracks are much smaller than those for long cracks measured by the standard WOL or CT specimens, which are eventually unconservative for the design of hydrogen components. This phenomenon is similar to the small crack problem in fatigue.

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Key Engineering Materials (Volumes 592-593)

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3-13

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.592-593.3

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Online since:

November 2013

Authors:

Yukitaka Murakami, Junichiro Yamabe, Hisao Matsunaga

Keywords:

Fatigue, Fatigue Crack Growth (FCG), Fracture, Fracture Toughness, Hydrogen Embrittlement, Small Crack

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