Evolution of secondary phases in Cr-V low-alloy steels during aging

The influence of both bulk vanadium content and aging conditions on the evolution of secondary phases in Cr-V low-alloy steels was studied. Three 0.1C-0.9Cr-V steels with different vanadium contents (0, 0.258, and 0.512 wt pct) were aged for 100 to 5,000 hours at 773, 853, 953, and 993 K. In the inv...

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Veröffentlicht in:	Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2004-03, Vol.35 (3), p.751-759
Hauptverfasser:	JANOVEC, J, VYROSTKOVA, A, SVOBODA, M, KROUPA, A, GRABKE, H. J
Format:	Artikel
Sprache:	eng
Schlagworte:	Carbides Casting Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Metallurgy Metals Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Precipitation Solid solution hardening, precipitation hardening, and dispersion hardening aging Solid solution, precipitation, and dispersion hardening aging Solid-phase precipitation Steel alloys Thermodynamics Transmission electron microscopy Treatment of materials and its effects on microstructure and properties
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Zusammenfassung:	The influence of both bulk vanadium content and aging conditions on the evolution of secondary phases in Cr-V low-alloy steels was studied. Three 0.1C-0.9Cr-V steels with different vanadium contents (0, 0.258, and 0.512 wt pct) were aged for 100 to 5,000 hours at 773, 853, 953, and 993 K. In the investigation, a limited experimental program (transmission electron microscopy (TEM)) was combined with credible thermodynamic predictions (ThermoCalc). Going out from the good agreement between the predicted and experimental results, behavior of the iron-rich M^sub 7^C^sub 3^ carbide in time-temperature scale was characterized. The influence of bulk vanadium content was determined on appearance of the M^sub 3^C carbide in equilibrium, temperature of the M^sub 7^C^sub 3^ carbide precipitation, metal compositions of M^sub 3^C or M^sub 7^C^sub 3^ carbides, and vanadium portion in the metallic part of the MX phase. [PUBLICATION ABSTRACT]
ISSN:	1073-5623 1543-1940
DOI:	10.1007/s11661-004-0003-1