Abstract
Measurements of habit planes and orientation relationships are reported for (225) F martensite plates in an Fe-6%Mn-0.9%C alloy previously used for shape strain determinations. The measurements confirm that the closepacked lines [11̄0] F and [111̄] B are not exactly parallel. No differences in habit plane or orientation relationship were detected between plates formed at a free surface and interior plates. By considering the complementary strain of the phenomenological theory of martensitic transformations to be composed of a shear on the martensite twinning elements and an unknown “supplementary” strain, the orientation measurements are used to determine the displacement of lines in the (225) F habit plane by this supplementary strain. It is shown that although reliable information can be obtained about the displacement of [11̄0] F, more accurate measurements would be needed to determine the displacement of the line in the habit plane at right angles to [11̄0] F.
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