Abstract
CSL/DSC and O-lattice calculations have been carried out for the case of M 2C secondary carbides precipitated in ferrite during tempering of high speed steel. The simultaneous occurrence of both the Pitsch-Schrader orientation relationship and another recently identified orientation relationship defined by (0001) M 2C //(021) α (1̄100) M 2C //(012̄) α (112̄0) M 2C //(100) α is explained quantitatively by the O-lattice and reduced O-lattice calculations. Possible secondary dislocation networks which accommodate the mismatch at the interface between the two phases are derived through calculation of the CSL/DSC and the secondary O-lattices. The results suggest that the length of the rod-like precipitates in the optimum tempered condition is determined by the length at which coherency between the two lattices breaks down.
Published Version
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