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Titolo:
On methane generation and decarburization in low-alloy Cr-Mo steels duringhydrogen attack
Autore:
Schlogl, SM; Van Leeuwen, Y; Van der Giessen, E;
Indirizzi:
Delft Univ Technol, Koiter Inst, NL-2628 CD Delft, Netherlands Delft Univ Technol Delft Netherlands NL-2628 CD 28 CD Delft, Netherlands Delft Univ Technol, Mat Sci Lab, NL-2628 CD Delft, Netherlands Delft Univ Technol Delft Netherlands NL-2628 CD 28 CD Delft, Netherlands
Titolo Testata:
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
fascicolo: 1, volume: 31, anno: 2000,
pagine: 125 - 137
SICI:
1073-5623(200001)31:1<125:OMGADI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
REGULAR SOLUTION MODEL; THERMODYNAMIC EVALUATION; VOID GROWTH; SYSTEM; CREEP; CAVITATION; PHASES; CARBON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Schlogl, SM Delft Univ Technol, Koiter Inst, NL-2628 CD Delft, NetherlandsDelft Univ Technol Delft Netherlands NL-2628 CD Netherlands
Citazione:
S.M. Schlogl et al., "On methane generation and decarburization in low-alloy Cr-Mo steels duringhydrogen attack", MET MAT T A, 31(1), 2000, pp. 125-137

Abstract

Low-carbon, low-alloy Cr-Mo steels may fail by hydrogen attack when they are exposed to high hydrogen pressures at elevated temperatures. During,thisprocess, the dissolved hydrogen reacts with the carbides of the steel to form methane in grain:boundary cavities. The methane pressure inside these cavities depends on the microstructure of the used steel, which consists of a ferritic matrix and alloy carbides such as M7C3, M23C6, M6C, and M2C. Thedifferent phases in the multicomponent system Fe-Cr-Mo-V-C are modeled with the sublattice model. Their Gibbs energies are then used to calculate theequilibrium methane pressure as a function of the microstructure. Driven by the methane pressure, the cavities grow due to grain boundary diffusion and dislocation creep, which is described by analytical relations. This leads to progressive development of damage inside the material but, at the sametime, to a decrease of the carbon content in the steel. This reduction depends on, among other factors, the methane pressure and the damage state. Asthe carbon content also affects the creep parameters, this process of decarburization may accelerate the cavity growth. Model calculations are used to obtain insight into the influence of this decarburization process on damage evolution and the final lifetime.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:39:09