Carbide reactions and phase equilibria in low alloy Cr-Mo-V steels tempered at 773--993 K. Part 1: Experimental measurements
- Slovak Academy of Sciences, Kosice (Slovakia). Inst. of Materials Research
- Academy of Sciences of Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
Carbide reactions and phase equilibria of 2.4Cr-0.7Mo, 2.6Cr-0.7Mo-0.14V, 2.6Cr-0.7Mo-0.3V, and 2.6Cr-1.0Mo-0.3V (wt%) steels tempered at 773--933 K for a maximum of 1,000 h were investigated. Carbide particles extracted in carbon replica were analyzed by means of electron diffraction and energy-dispersive X-ray spectroscopy. Thermodynamic calculations were used to complement and make accurate the experimental results. The time-temperature diagrams of carbide phase stability were constructed for all investigated steels. Here the M{sub 3}C, M{sub 2}C, M{sub 7}C{sub 3} and MC carbides in various combinations are lined up in sequences, the carbides M{sub 23}C{sub 6} and M{sub 6}C form separate areas. The shape of the M{sub 6}C area is similar to that of the Laves phase in medium alloy steels. In the investigated steels three types of phase equilibria were found: ferrite + M{sub 7}C{sub 3}, ferrite + M{sub 7}C{sub 3} + MC and ferrite + M{sub 7}C{sub 3} + M{sub 6}C + MC.
- OSTI ID:
- 585919
- Journal Information:
- Acta Materialia, Vol. 46, Issue 1; Other Information: PBD: 19 Dec 1997
- Country of Publication:
- United States
- Language:
- English
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