Abstract
Specimens of iron doped with 0.090 and 0.018 wt.% boron, respectively, were examined by Auger emission spectroscopy after each of a succession of treatments, viz. ion bombardment, heat treatment at increments of 100°C from 500°C to 900°C, inclusive, and then at 1050°C, and finally gas reaction in oxygen and in hydrogen at 750°C. Boron was observed as a trace on the surface at 500°C and 600°C, was measurable at 700°C, and saturated quickly at 800°C and above. There was no difference in the behaviour or the saturation level between the two concentrations. Other elements, and in particular sulphur, were also observed to segregate, sulphur so much so that it dominated the surface concentrations at 1050°C. Nitrogen was observed to behave in a manner identical to that of boron, even to the doubling in concentration seen after the gas reactions with oxygen, and then with hydrogen, had removed some of the sulphur.
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