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Abstract
Tempered martensitic and tempered bainitic samples of a commercial 3·5Ni–Cr–Mo–V rotor steel containing either 0·2 or 0·7 wt-%Mn, were embrittled at 475, 500, and 525°C for different periods. The materials were subsequently fractured in ultrahigh vacuum and their grain-boundary compositions determined by Auger electron spectroscopy. It was shown that Mn modifies the kinetics of P segregation (P being the most significant embrittling agent present) in accordance with the results of Gruzin and Mural for the bulk diffusion of P in Fe.