Abstract
Equilibrium segregation of phosphorus at the grain boundaries of austenite has been studied in Fe-P-, Fe-0.16%C-P- and Fe-0.35% C-P-alloys. The samples were equilibrated at temperatures of 850–1200 ° C and analysed after rapid quenching using Auger-Electron Spectroscopy. The results in Fe-P-alloys may be evaluated according to the Langmuir-McLean equation. The following expression for the free energy of P-segregation in austenite was obtained: -gDGpo= −21300 −25.8* T (J/mole). For the Fe-P-C-alloys the carbon concentration increases at the grain boundaries with increasing carbon concentration in the bulk and phosphorus segregation decreases. The observed carbon segregation does not show any dependence on austenitising temperature and the temperature dependence on P-segregation is also insignificant. Reasons for this behaviour are discussed.
Published Version
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