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An in‐situ Mössbauer Study of the Formation of Cementite, Fe 3 C
Author(s) -
Kniep B.,
Constantinescu A.,
Niemeier D.,
Becker K. D.
Publication year - 2003
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300136
Subject(s) - cementite , mössbauer spectroscopy , kinetics , in situ , materials science , kinetic energy , crystallography , analytical chemistry (journal) , chemistry , metallurgy , microstructure , physics , austenite , organic chemistry , chromatography , quantum mechanics
The formation of cementite, Fe 3 C, from thin iron foils has been studied at 550 and 650 °C by means of in‐situ Mössbauer spectroscopy. At 550 °C, the kinetics of the reaction have been determined from time‐resolved experiments performed at different carbon activities. The product formation follows a two‐step process exhibiting two different kinetic regimes. The slow initial stages of the reaction as well as its rapid final part can be described by an Avrami‐type kinetics with a characteristic parameter of n = 3/2.