Studies on the occurrence, morphology and identity of nitride precipitates in iron and steel
Although γ'-Fe4N iron nitride precipitates formed in a solid iron matrix were extensively examined as long ago as 1934 (1), their detailed structure was not elucidated until 1948 when Jack (2) performed an X-ray diffraction examination of nitrided iron powders. The occurrence of a second type of iron nitride precipitate, a low temperature form, was first reported by Dijkstra (3) and Wert (4). In further investigations with nitrided iron powders, Jack (5) determined the structure of this phase, which he termed α''-Fe16N2 iron nitride. Several investigators (6) have observed two types of plate-like precipitate in nitrided iron specimens and assumed these to be the γ' and α'' phases, but no proof of identification was given.
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