NDLI: Hydrogen Dragging by Moving Dislocation and Enhanced Lattice Defect Formation in 316L and 304 Stainless Steels

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Takai, Kenichi Kitamura, Megumi
Copyright Year	2013
Abstract	Little is known about an enhanced lattice defect formation due to an interaction between hydrogen and dislocation in face-centered cubic (fcc) metals such as stainless steels. In the present study, hydrogen spectra evolved from Type 316L and 304 stainless steels during elastic and plastic deformation were detected using a quadrupole mass spectrometer. The amount of lattice defect enhanced by hydrogen and strain was measured using thermal desorption analysis. For 316L stainless steel, hydrogen desorption increased rapidly when plastic deformation began, since the dislocation dragged hydrogen to the surface of the specimen. In contrast, hydrogen desorption increased with applying strain for 304 stainless steel, because of phase transformation from austenite into martensite with larger hydrogen diffusivity. And the amount of desorbed hydrogen increased with decreasing strain rate. These results indicate that dislocation can drag and transport large amounts of hydrogen when the dislocation velocity approaches the hydrogen diffusion rate. The amount of lattice defects in stainless steels was enhanced by hydrogen and applied strain. The most probable reason for the increase in the amount of lattice defects can be ascribed to the increase in the amount of vacancy clusters. These findings lead to the conclusion that the interaction between dislocation and hydrogen enhances the formation of vacancy clusters, as a result, causes hydrogen embrittlement.
Sponsorship	Pressure Vessels and Piping Division Nondestructive Evaluation Engineering Division
File Format	PDF
ISBN	9780791855713
DOI	10.1115/PVP2013-97231
Volume Number	Volume 6B: Materials and Fabrication
Conference Proceedings	ASME 2013 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2013-07-14
Publisher Place	Paris, France
Access Restriction	Subscribed
Subject Keyword	Deformation Hydrogen Metals Desorption Thermal desorption Drag (fluid dynamics) Diffusion (physics) Phase transitions Dislocations Mass spectrometers Spectra (spectroscopy) Stainless steel Hydrogen embrittlement
Content Type	Text
Resource Type	Article

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