Abstract
Phosphorus surface segregation was measured by Auger Electron Spectroscopy on a 17-4 PH martensitic stainless steel at 450, 550 and 600 °C. Surface segregation was shown to be much faster than expected which was attributed to a high contribution of phosphorus diffusion along the former austenitic grain boundaries. A model of surface segregation was developed following the Darken–du Plessis approach and taking account of both bulk and grain boundary solute diffusion. The phosphorus grain boundary diffusion coefficient in 17-4 PH was estimated: D GB < = 6.2 10 4 exp(− 157 kJ mol − 1 /RT)cm 2 s − 1 . It is found to be more than three orders of magnitude higher in 17-4 PH steel than in α-iron.
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