Abstract
A computer program was developed which takes experimental orientation analysis data from the transmission electron microscope and determines the corresponding best fit crystal orientation. This program was used to analyse the relative orientations between pearlitic ferrite and cementite in annealed and as-rolled eutectoid steel in terms of near-coincident site lattice (NCSL) solutions.The NCSL theory predicted not only the “standard” orientation relationships, i.e. Bagaryatskii and 2nd Petch, but also “non-standard” orientation relationships. Certain observed ferrite/cementite relative orientations showed significant deviations from any NCSL. The explanation of these deviations and of the non-observation of certain low-sigma solutions probably requires the consideration of inter-atomic forces, rather than only the near-coincidence of lattice points.
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