Abstract
Different experimental measurements show that transformations of martensite occur from very low temperature, often below 77K. In order to understand the redistribution of interstitial atoms which is studied by Mossbauer spectrosopy near room temperature the previous low temperature changes are briely discussed. The Mossbauer data related to cubic γ, γ', α' and a'' Fe-N alloys are presented. It is shown that the interstitial atom distribution and redistribution of interstitial atoms is partially inherited from austenite and that γ' Fe 4 N nuclei corresponds in γ and α' to N-Fe-N chains oriented along in γ and along in α'
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