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Titolo:
CARBIDE REACTIONS AND PHASE-EQUILIBRIA IN LOW-ALLOY CR-MO-V STEELS TEMPERED AT 773-993 K - PART II - THEORETICAL CALCULATIONS
Autore:
KROUPA A; VYROSTKOVA A; SVOBODA M; JANOVEC J;
Indirizzi:
ACAD SCI CZECH REPUBL,INST PHYS MAT,ZIZKOVA 22 BRNO 61662 CZECH REPUBLIC SLOVAK ACAD SCI,INST MAT RES KOSICE 04353 SLOVAKIA
Titolo Testata:
Acta materialia
fascicolo: 1, volume: 46, anno: 1997,
pagine: 39 - 49
SICI:
1359-6454(1997)46:1<39:CRAPIL>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMODYNAMIC EVALUATION; SYSTEM; MODEL;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
A. Kroupa et al., "CARBIDE REACTIONS AND PHASE-EQUILIBRIA IN LOW-ALLOY CR-MO-V STEELS TEMPERED AT 773-993 K - PART II - THEORETICAL CALCULATIONS", Acta materialia, 46(1), 1997, pp. 39-49

Abstract

The coexistence of carbide phases in thermodynamic equilibrium was studied by means of theoretical calculations and compared with experimental results. The study was carried out for systems corresponding to experimentally used low alloy Cr steel (approx. 2.5 wt%) with different Mo (0.70-1.0 wt%) and V (0.02-0.32 wt%) contents. The carbon content in experimental materials was about 0.1 wt%. Theoretical calculations were realized by the PD-pp software and the modelling of thermodynamic equilibria in the Fe-Cr-Mo-V-C system for the concentration corresponding to the experimental materials based on the Hillert-Staffansson sublattice model was carried out. The equilibrium phase coexistence of carbidic phases with b.c.c. ferrite was calculated in dependence on temperature. It was found that M23C6 carbide is thermodynamically stable for low temperatures (up to 800-850 K) and then gradually replaced by M7C3 for higher temperatures. M6C is stable up to 890-950 K and dissolves completely. MC carbide was found to be thermodynamically stable forall temperatures for systems with vanadium content above 0.1 wt%. Good qualitative agreement between the theoretical and experimental results was reached. (C) 1997 Acta Metallurgica Inc.

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Documento generato il 26/11/20 alle ore 09:54:42