Abstract
In view of the great interest in HSLA steels with small additions of titanium, niobium and/or vanadium, the solubility products of nitrides, carbides and carbonitrides in austenite have been investigated both theoretically and experimentally by many researchers. Nordberg and Aronsson first derived the solubility product for a complex carbonitride of a single microalloying element such as niobium, on which Hudd et al made some modifications. More recently, the complex addition of microalloying elements in HSLA steels has also received more attention. Clearly, the equilibrium composition of the precipitates depends on the composition of the steel and on the temperature. Some theoretical method have been derived to give this information, but none of them deal with the solubility product of complex carbonitrides containing more than one microalloying element (e.g. niobium and titanium). In the present paper, a general solubility product expression is derived for all kinds of complex carbonitrides with multicomponent microalloying additions.
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