Experimental investigation and thermodynamic modeling of molybdenum and vanadium-containing carbide hardened iron-based alloys

Elodie Cabrol (1) , Cédric Bellot (1, 2) , Pascal Lamesle (1) , Denis Delagnes (1) , E. Povoden-Karadeniz (3)

1 ICA - Institut Clément Ader
2 Aubert & Duval
3 TU Wien - Vienna University of Technology = Technische Universität Wien

A technique for the microstructural study of steels, based on the use of matrix dissolution to collect the very low number density precipitates formed in martensitic steels, has been considerably improved. This technique was applied to two different grades of alloy, characterized by high nickel and cobalt contents and varying chromium, molybdenum and vanadium contents. The technique was implemented at temperatures ranging between 900 degrees C and 1000 degrees C, in order to accurately determine experimental data including the crystallographic structure and chemical composition of the carbides, the carbide solvus temperatures, and variations in the chemical composition of the matrix. These experimental investigations reveal that the solubility of molybdenum in FCC carbides can be very high. These results have been compared with the behavior predicted by computational thermodynamics, and used to evaluate and improve the thermodynamic Matcalc steel database. This upgraded database has been validated on three other steels with different chemical compositions, characterized by the same Fe-Cr-Mo-V-C system.

Mots clés: X-ray diffraction; Metals and alloys; Precipitation; Phase diagrams

Domaines: Matériaux

Elodie Cabrol, Cédric Bellot, Pascal Lamesle, Denis Delagnes, E. Povoden-Karadeniz. Experimental investigation and thermodynamic modeling of molybdenum and vanadium-containing carbide hardened iron-based alloys. Journal of Alloys and Compounds, 2013, 556, pp.203-209. ⟨10.1016/j.jallcom.2012.12.119⟩. ⟨hal-01687317⟩