Abstract
Post-implantation annealing of N-implanted 304 stainless steel at 400 °C has been investigated by conversion electron Mossbauer spectroscopy, X-ray diffraction and Auger electron spectroscopy. After a 1 h anneal, the near complete dissolution of the as-implanted Fe2N-like nitride phase results in a 9 at.% N fcc solid-solution phase. After the final anneal (64 h), N has diffused to a depth of about 2 μm and remains in solid solution with an average content of 4 at.%. An average N diffusion coefficient at 400 °C is estimated to be ∼10-12-10-14 cm2/s, depending on anneal time, too small to explain the deep penetration observed in high-flux, high-dose N-implanted stainless steel. The present results provide additional evidence for beam controlled N migration where Cr plays an important role.
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