Abstract
The present work suggests the existence of crystallographic degeneracies in the FCC-BCC transformation and it has been shown that it is possible to understand the tent-like relief associated with some Widmanstätten ferrite plates in terms of the formation of back-to-back mutually accomodating variants. It should be noted that the general arguments presented in this paper should also be applicable to the bainite and martensite transformations in low alloy steels. The crystallographic analysis and other considerations indicate that the surface relief of Widmanstätten ferrite can be understood in terms of a displacive transformation mechanism. This hypothesis has been discussed in terms of previous work.
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