Iron – Nitrogen – Vanadium

Pierre Perrot

Introduction

Vanadium has a strong affinity for N and forms fine nitrides and carbonitrides in steels which improve their strength and the toughness by pinning the grain growth to a considerable extent. Experimental investigations on phase equilibria and thermodynamics, mainly related to the nitrogen solubilities in liquid, α and γ phases are gathered in Table 1. Few experimental information exists in the ternary phase diagram [1978ElS] and Calphad assessments [1991Oht2] are useful to get an insight to the equilibria between phases. A review on the phase equilibria in the Fe-N-V system may be found in [1983Rag, 1984Rag, 1987Rag1, 1993Rag]. A Calphad assessment of the Fe-N-V system has been carried out by [1991Oht2...