Abstract
The age-hardenable austenitic Fe-Mn-Al-C alloys have been extensively investigated by many researchers as a high strength material for structural applications and as a sideband alloy that decomposes into a [100] modulated structure on aging at lower temperatures. Little is known about the precipitation of Nb(C,N) carbo-nitride in Nb-containing austenitic Fe-Mn-Al-C alloys, and occurrence of general matrix precipitation in those alloys has not been reported. On the other hand, there have been many studies of the precipitation of NbC from Nb,C-containing austenitic Fe-Cr-Ni steels. In particular, it has been documented in detail that rapid solidification could facilitate a dense precipitation of NbC carbide in the alloy matrix. Inspired by these earlier works, a study was undertaken to investigate precipitation reactions, especially of Nb(C,N), in Nb-containing austenitic Fe-Mn-Al-C alloys prepared by the melt-spinning process. In this brief paper, the authors present some results of the work, demonstrating that fine precipitates of Nb(C,N) carbo-nitride can be produced in the matrix of an austenitic Fe-Mn-Al-C alloy. Also, a discussion as to the observed mode of the matrix Nb(C,N) precipitation is presented.
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