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Titolo:
The thermodynamics aspects of hydrogen induced embrittlement
Autore:
Wang, JS;
Indirizzi:
Harvard Univ, Div Appl Sci & Engn, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 l Sci & Engn, Cambridge, MA 02138 USA Northwestern Univ, Adv Coating Technol Grp, Mat Technol Lab, Evanston, IL 60201 USA Northwestern Univ Evanston IL USA 60201 chnol Lab, Evanston, IL 60201 USA
Titolo Testata:
ENGINEERING FRACTURE MECHANICS
fascicolo: 6, volume: 68, anno: 2001,
pagine: 647 - 669
SICI:
0013-7944(200104)68:6<647:TTAOHI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRAIN-BOUNDARY SEGREGATION; NI-SINGLE CRYSTALS; CRACK TIPS; DISLOCATION NUCLEATION; INTERGRANULAR FRACTURE; CLEAVAGE FRACTURE; PLASTIC-FLOW; IRON; NICKEL; SURFACE;
Keywords:
hydrogen embrittlement; ductile to brittle transition; micromechanics; steels;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
93
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, JS Northwestern Univ, Adv Coating Technol Grp, Mat Technol Lab, Evanston, IL 60201 USA Northwestern Univ Evanston IL USA 60201 , Evanston, IL 60201 USA
Citazione:
J.S. Wang, "The thermodynamics aspects of hydrogen induced embrittlement", ENG FRACT M, 68(6), 2001, pp. 647-669

Abstract

The present work provides a detailed analysis of the segregation induced hydrogen embrittlement in metals. Based on the assumption that the ductile versus brittle transition is controlled by the competition between dislocation emission and interfacial decohesion, hydrogen-induced embrittlement (HIE) is believed to occur due to the reduction of cohesion induced by segregation of hydrogen. A thermodynamic-kinetic model for the change in cohesion induced by segregation is proposed. In particular, the mobility related characteristics of HIE is addressed. It is shown that a "mobile" normal segregant reduces the cohesion greater than an "immobile" segregant does. For HIE in steels, a transient behavior occurs at room temperature because of the high diffusivity of hydrogen in iron. The model predictions are supported byexperimental results for Fe-3%Si alloys and nickel. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 25/11/20 alle ore 01:10:06