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Titolo:
THE STRUCTURE OF THE HEAT-AFFECTED ZONE IN WELDS OF A NI-29 WT-PERCENT MO COMMERCIAL ALLOY (HASTELLOY-B2)
Autore:
CAO S; BROOKS CR; WHITTAKER G;
Indirizzi:
UNIV TENNESSEE,DEPT MAT SCI & ENGN KNOXVILLE TN 37996 UNIV TENNESSEE,CTR MAT PROC KNOXVILLE TN 37996 TENNESSEE EASTMAN CO KINGSPORT TN 37662
Titolo Testata:
Materials characterization
fascicolo: 1, volume: 33, anno: 1994,
pagine: 21 - 32
SICI:
1044-5803(1994)33:1<21:TSOTHZ>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
B2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
S. Cao et al., "THE STRUCTURE OF THE HEAT-AFFECTED ZONE IN WELDS OF A NI-29 WT-PERCENT MO COMMERCIAL ALLOY (HASTELLOY-B2)", Materials characterization, 33(1), 1994, pp. 21-32

Abstract

The microstructure of a welded pipe of Hastelloy B2 removed from a coal gasification plant was examined. Although this alloy is susceptibleto severe embrittlement if ordering occurs, no significant ordering was found in the heat-affected zone (HAZ) or the weld, and the materialwas ductile. However, intergranular corrosion was found in the HAZ, and fine (e.g., 0.1mm) particles of Mo-rich M12C carbide and the intermetallic compound NiMo were found in the grain boundaries. These are apparently depleting the adjacent matrix of Mo, rendering the grain boundary region susceptible to corrosion. A single- and a double-pass autogeneous weld made on the base-plate material were examined. No ordering was detected in the HAZ, which is consistent with the measured temperature-time curves of regions adjacent to the weld and with the known ordering kinetics. In the HAZ, fine grain boundary particles of M12C carbide were detected, and NiMo may also be present.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 13:31:31