Abstract
In view of the recent thin film work which has shown that at least some plates of martensite are twinned on a fine scale, the possible twinning modes of the martensite structure are examined in detail. These reduce to fourteen different shear modes, which are used as initial data for a current theory of martensite crystallography. It is shown that only six of these modes can in fact result in twinned martensite plates and a comparison of the corresponding predictions and the observed crystallographic features indicates that only one type of twinned martensite is likely to occur in practice. This type has been observed in several steels. Further developments of the theory which appear to be necessary in order to explain all the observed features are also discussed.
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