Abstract
The paper presents the results of interfacial studies of 19Cr-13Ni austenitic stainless steel doped with 0.26 mass % phosphorus after annealing at 700 and 800 °C for 100 and 1000 h by means of high resolution Auger electron spectroscopy (HRAES). After annealing for 100 h the lower than equilibrium concentration of phosphorus at grain boundaries was revealed. The P-S site competition effect was considered as a possible reason of this phenomenon. The local increase of phosphorus grain boundary concentration above the equilibrium level after annealing for 1000 h at both temperatures was attributed to the presence of Cr, P-rich particles (probably chromium phosphides).

Key words
austenitic steel, grain boundary segregation, phosphorus, sulfur, High Resolution Auger Electron Spectroscopy (HRAES)

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