Lattice defects dominating hydrogen-related failure of metals

被引：296

作者：

Takai, K. ^{[1
]}

Shoda, H.

Suzuki, H. ^{[1
]}

Nagumo, M. ^{[2
]}

机构：

[1] Sophia Univ, Dept Engn & Appl Sci, Chiyoda Ku, Tokyo 1028554, Japan

[2] Waseda Univ, Chiba 2720827, Japan

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 18期

关键词：

Hydrogen embrittlement; Lattice defects; Vacancies; Iron; Nickel alloys;

D O I：

10.1016/j.actamat.2008.06.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The factor that plays the essential role in hydrogen-related failure has been examined for Inconel 625 and iron by means of tensile testing with interposed unloading and reloading with/without hydrogen charging. Aging at 30 degrees C or annealing at 200 degrees C was conducted during the unloaded stage in order to diffuse out hydrogen or to anneal out strain-induced defects. Hydrogen thermal desorption analysis was used to evaluate strain-induced defects that act as trapping sites of hydrogen. Fracture strain decreased in the initially hydrogencharged specimens even though hydrogen was absent at the late stage of straining. Annealing at 200 degrees C at the unloaded stage almost completely recovered the decrease in fracture strain. Enhancement of strain-induced defects by hydrogen and their involvement in degradation were revealed by means of hydrogen thermal desorption analysis. The results provide direct evidence of the primary role of vacancies rather than hydrogen itself in hydrogen degradation, and agree well with the hydrogen-enhanced strain-induced vacancy model with respect to the mechanism of hydrogen-related failure. (C) 2008 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页码：5158 / 5167

页数：10

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