The new orientation relationship is:(022)Z‖(111 A[100]Z‖[112]A[011]Z‖[110]A.In terms of this variant of orientation relationship, the experimentally determined habit plane is (015)Z 1.1° from (201)A.
The experimental data exhibit a preference for specific variants of this orientation relationship: those variants corresponding to relatively low cementite ferrite misfit-strain energy are favoured.
Variants of these orientation relationships have been frequently observed.
However, a close look at Fig. 6 reveals that many potential quadrilaterals may be derived from groups of connected interceptions that resemble the remaining patterns or their variants of different orientations in Fig. 7.
These crystallographic features often result in a single variant of austenite orientation at a grain boundary.
It is based on the accommodation of coherency strain achieved by spatial rearrangement of orientation variants of the precipitate phase in an optimal pattern.
Moreover most misorientations between these dominant orientations are of low-order ∑ 3n-type (n = 1, 2), and the 4 sub-dominant orientations are twinning variants of the first-dominant orientation in most cases.
It is shown that the chessboard-like microstructure is produced by strain-driven, self-assembling of orientation variants of the precipitate phase, faceted by the planes normal to the elastically soft directions.
The development of the transformation through nucleation, growth and coarsening of orientation variants is simulated for both single crystal and polycrystalline materials.
The development of the martensitic transformation through nucleation, growth and coarsening of orientation variants is simulated at different levels of the applied stress.
