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Titolo:
Fatigue crack propagation in 2.25 Cr-1.0Mo steel weldments in air and hydrogen
Autore:
Tsay, LW; Liu, CC; Chao, YH; Shieh, YH;
Indirizzi:
Natl Taiwan Ocean Univ, Inst Mat Engn, Keelung 202, Taiwan Natl Taiwan Ocean Univ Keelung Taiwan 202 Mat Engn, Keelung 202, Taiwan Natl Taiwan Ocean Univ, Dept Mech & Marine Engn, Keelung 202, Taiwan Natl Taiwan Ocean Univ Keelung Taiwan 202 rine Engn, Keelung 202, Taiwan Taiwan Power Co, Power Res Inst, Taipei, Taiwan Taiwan Power Co Taipei Taiwan Power Co, Power Res Inst, Taipei, Taiwan
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 299, anno: 2001,
pagine: 16 - 26
SICI:
0921-5093(20010215)299:1-2<16:FCPI2C>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRESS-CORROSION CRACKING; RESIDUAL-STRESS; GROWTH BEHAVIOR; MARAGING-STEEL; EMBRITTLEMENT; WELDS;
Keywords:
fatigue crack growth rates; weld metal; heat-affected zone; fracture feature; impact toughness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Tsay, LW Natl Taiwan Ocean Univ, Inst Mat Engn, Keelung 202, Taiwan Natl Taiwan Ocean Univ Keelung Taiwan 202 , Keelung 202, Taiwan
Citazione:
L.W. Tsay et al., "Fatigue crack propagation in 2.25 Cr-1.0Mo steel weldments in air and hydrogen", MAT SCI E A, 299(1-2), 2001, pp. 16-26

Abstract

Fatigue crack growth (FCG) behaviour of 2.25Cr-1.0Mo steel plate and weldstested in air and gaseous hydrogen was investigated. Microstructural observations indicated that both the weld metal GYM) and heat-affected zone (HAZ) were composed of mainly bainitic microstructure. A ferrite matrix with uniformly dispersed carbides was found in the annealed base metal. The changein microstructures of WM and HAZ between the as-welded and tempered welds was limited. The as-welded WM had the lowest impact toughness among the specimens, however, the impact toughness was improved after postweld heat treatment at 700 degreesC/1 h. Regardless of the testing environments, the as-welded WM exhibited a higher resistance to crack growth than the steel plateas the crack propagated transversely to the welding direction, especially in the low DeltaK range. However, higher fatigue crack growth rates in the as-welded HAZ than those of the steel plate were found. As the crack grew along the fine-grained heat-affected zone in the as-welded condition, significant retardation of crack growth as compared with that of the steel plate was obtained when tested in air or gaseous hydrogen. In various regions of the weld, the FCG behaviour of tempered welds was similar to that of the steel plate in air. The results also indicated that the tempered bainitic microstructure present in WM or HAZ was more resistant to unstable crack growth than the annealed steel plate tested in gaseous hydrogen. Environmentallyinduced acceleration of FCG in various regions of the weld was usually exhibited a change of fracture features. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 26/09/20 alle ore 05:35:45