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Titolo:
Microstructural analysis of carbonitrided austenitic steels
Autore:
Ford, SI; Munroe, PR; Young, DJ;
Indirizzi:
Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia Univ NewS Wales Sydney NSW Australia 2052 n, Sydney, NSW 2052, Australia
Titolo Testata:
MICRON
fascicolo: 8, volume: 32, anno: 2001,
pagine: 817 - 824
SICI:
0968-4328(200112)32:8<817:MAOCAS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSMISSION ELECTRON-MICROSCOPY; HIGH-TEMPERATURE CORROSION; ENVIRONMENTS; ALLOYS;
Keywords:
internal oxidation; carbonitridation; focused ion beam miller; lamellar carbide; TEM; carbide transformations austenite; heat resisting steel; stainless steel;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Young, DJ Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia Univ New S Wales Sydney NSW Australia 2052 NSW 2052, Australia
Citazione:
S.I. Ford et al., "Microstructural analysis of carbonitrided austenitic steels", MICRON, 32(8), 2001, pp. 817-824

Abstract

An austenitic heat resisting steel containing 25% Cr and 19% Ni was internally carbonitrided in an atmosphere of 0.5% C3H6, 9.5% H-2 and 90% N-2. Immediately below the alloy surface, globular precipitates were observed. At greater depth, two zones of lamellar morphology precipitates were observed to form. M7C3 was found directly beneath the surface and M23C6 was found closer to the reaction front. The lamellar carbide morphology is more typically characteristic of the precipitates formed during nitriding rather than carburising, suggesting that nitrogen plays some role in the precipitation process. A focused ion beam (FIB) miller was used to create thin, electron transparent locations at specific regions in the precipitation zone in order to characterise, via transmission electron microscopy, the crystallography and composition of the phases present. In this study, thin areas were produced in the lamellar region at the transition between the M23C6 and M7C3 regions. The composition, crystal structure, and orientation relationships arereported and compared to those found previously at both the internal precipitation front and the sample surface. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:30:29