Abstract
This overview is an attempt to consolidate the understanding that can be obtained through the measurement of grain boundary segregation isotherms in terms of (a) the kinetics of segregation, (b) the interaction processes among trace and alloying elements, and (c) the influence of solute elements, heat treatment practice, and applied tensile stress on grain boundary segregation processes. The importance of understanding intergranular segregation behaviour is highlighted through discussion of relevant published work on engineering steels.