In low-density steels, why Fe3C is not formed and only Kappa phase is formed ?

15 April 2021 1 8K Report

In low-density steels which are based on Al, Mn and C alloying elements. why Fe3C is not formed and only Fe3AlC or (Fe,Mn)3AlC is formed.

Is (Fe,Mn)3AlC is more bulky and harder than Fe3AlC .

Atef S. Hamada

Because of the Al and Mn additions, κ-phase is promoted in the structure. The Al addition promotes the precipitation of the nano‐sized κ‐phase (Fe, Mn)3AlC from the austenite matrix in the Fe–Mn–Al–C austenitic alloys. the κ‐phase is strongly influenced by the aging time and aging temperature, as well as the actual alloy composition. the κ‐phase has higher thermodynamic stability and driving force than that the Fe3C in Fe-Mn-Al-C alloys.

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