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Influence of grain size on internal oxidation behaviour at 1273K in dry air of Fe-20Mn-8Al-0.45C (wt.%) has been investigated. The measured weight gains are in parabolic relation to oxidation time and parabolic rate constant degrades with the reduction of grain size. Grain size affects compositions of oxides in the initial oxidation process and diffusion abilities of cations. Fine-grained alloy becomes...
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