An experimental and theoretical analysis of the phase equilibria in the Fe-Cr-V-C system

Abstract

New experimental phase equilibria information about the Fe-Cr-V-C system are presented and used to modify the thermodynamic description of the system. The main interest was focused on the composition of the MC and M 7 C 3 carbides and the necessary adjustment of the Cr and V distribution between carbides and matrix. A new set of thermodynamic parameter values describing the Gibbs energy of different phases was obtained. A number of calculated sections of the Cr-C, Cr-V-C, Fe-Cr-C, and the Fe-Cr-V-C systems are presented and compared against both new and old experimental information. Calculations on commercial alloys to verify the improvements in multicomponent systems are also presented. The present calculation using the Thermo-Calc software shows much better agreement with the new experimental results than previous assessments.

Phase Transformations in High Alloy Cold Work Tool Steel

“…The obtained results extend the data obtained by others authors related to ledeburitic tool steels [1], [11], [16], [17], [23], [27], [31] and [32]. The results may be useful for the next thermodynamic analysis of phase transitions using the Thermo-Calc and Dictra software.…”

“…High alloy tool steels of ledeburitic type produced by powder metallurgy (PM) contain a high amount of carbon and alloying elements (mainly V, Cr, Mo) that form carbides [1] to [3]. Conventional methods preparation of ledeburitic type tool steels (mould casting and forming) was influenced by the liquation and segregation processes, which lead to anisotropy of microstructure and properties of high alloy tool steels with high carbon content.…”

Fe–Cr–V ferritic steels for possible nuclear applications

“…Then, by adding 5, 10, and 15% vanadium we expect to form alloys residing within the a phase, a plus (Cr, V), and a plus r phase region as indicated by the circles in Finally, for the case of 10% Cr and 10% V carbon has been added with concentrations of 0.2% and 0.4%. This should lead to pronounced carbide formation as investigated and described in [4] and might result in a further increase in hardening. The resulting five different Fe-Cr-V alloys/steels are listed in Table 1.…”

Melting Separation Behavior and Mechanism of High-chromium Vanadium–bearing Titanomagnetite Metallized Pellet Got from Gas-based Direct Reduction

“…22) While the vanadium and chromium is strong carbide-forming elements. In the binary system of Fe-C, 23,24) the austenite with face-centered cubic structure (γ (FCC)) occurs in the Fe-rich regions at around 1 200°C. 25) And the newly-formed carbides are then dissolved in the metallic iron forming γ (FCC) phase, which may result in the increases of the recoveries.…”