Carbide reactions and phase equilibria in low alloy Cr-Mo-V steels tempered at 773--993 K. Part 1: Experimental measurements

Journal Article · Fri Dec 19 04:00:00 EST 1997 · Acta Materialia

OSTI ID:585919

Vyrostkova, A; Janovec, J ^[1]; Kroupa, A; Svoboda, M ^[2]

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1. Slovak Academy of Sciences, Kosice (Slovakia). Inst. of Materials Research
2. 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, Journal Name: Acta Materialia Journal Issue: 1 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
LOW ALLOY STEELS
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
PHASE STUDIES
VANADIUM ADDITIONS