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ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01889-5
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three-dimensional atom probed; iron-niobium alloy; interstitial elements; primary recrystallisation
The effect of nitrogen and carbon on the early stage of static recrystallisation of hot-deformed austenite in a binary Fe-Nb alloy was investigated using a three-dimensional atom probe (3DAP). Double compression tests reveal that the onset of the recrystallisation is retarded by the addition of nitrogen or carbon to the Fe-Nb binary alloy. with nitrogen having a much stronger effect. Nb-interstitial complexes were desorbed from the matrix of the Fe-Nb-N alloy in the form of NbN2+ and NbN3+. FeN ion complexes were also desorbed from the Fe-Nb-N alloy kept for it longer holding time after deformation. In contrast, no NbC and FeC complexes were desorbed from the Fe-Nb-C alloy. A combination of transmission electron microscopy and AP analysis shows that the retardation of the early stage of the recrystallisation can be caused by solute interstitial atoms and small substitutional-interstitial atomic clusters, not by finely dispersed niobium carbonitrides. (C) 2002 Elsevier Science B.V. All rights reserved.
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