Microstructure and Deformation Behaviour of Iron-Rich Iron-Aluminium Alloys with Ternary Carbon and Silicon Additions

摘要

The microstructure, hardness, yield stress, fracture strain, and brittle-to-ductile transition temperature of Fe-Al alloys with Al contents of 12 - 18 at. percent Al, which are in the range of the so-called k-state with possible short-range ordering reactions, and with ternary additions of carbon and silicon were studied with respect to the effects of possible impurities on the hardening of Fe-Al alloys It was found that perovskite-type Fe_3AlC carbide particles precipitate even in alloys with low C and Si contents; they are controlled by prior heat treatments and strongly affect the deformation behaviour.