Abstract
The microstructure and phase transformations occurring ine-iron-carbonitrides have been studied by means of X-ray and electron diffraction, electron microscopy and Mossbauer spectrometry. Ordering of the interstitial atoms, N or C, results in a hexagonal unit cell for Fe3(C, N) with parametersa′=a√3 andc′=c wherea andc are the lattice parameters of the hexagonal close-packed (h c p) iron unit cell. Stacking faults on (0001)∈ planes and partial dislocations with Burgers vector b=1/3〈1 0 ¯1 0〉 are observed in quenchede-Fe4 (C, N). After quench-aging, the carbonitrides show a structural hardening due to the precipitation of a metastable phase. Slow cooling ofe-carbonitrides with less than 25 at% interstitials leads to the precipitation ofγ′-carbonitride and ferrite ine-phase grains which allows the orientation relationships between thee-,γ′- andα-phases to be defined and a model of thee-phase-γ′-phase transformation to be proposed.
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