Phase equilibria in the Fe–Cr–V system at 900°C

The phase equilibria in the Fe–Cr–V ternary system at 900°C (1173 K) were studied using XRD, metallography and EPMA. The main attention was focused on the character of propagation of the σ phase from the Fe–V edge into the ternary system. As show n by the present data, at 900°C the field of the σ phase is directed from the Fe–V side towards the composition of the σ phase of the Fe–Cr binary edge (which is virtual at that temperature). The solubility of Cr in the σ phase at 900°C reaches about 40 at.%.