Abstract

The addition of stabilising elements such as Nb or Ti to ferritic stainless steel has gained in importance in recent years. These elements are added to the steel mainly to stabilise C and N, i.e. to remove C and N from the solid solution, owing to their strong tendency to form carbide and nitride precipitates. However, when added in excess, stabilising elements also provide different mechanical properties and corrosion behaviour to the steel. In order to understand the benefits of these additions, it is essential to know the fraction of these elements dissolved in the steel matrix. In this work, electron probe microanalysis (EPMA) results of different Ti-stabilised and Nb-stabilised ferritic stainless steel grades are reported, with the aim of determining the soluble fraction of Ti and Nb and elucidate its relationship with the bulk content of these elements.

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