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The spatial variation in martensite tetragonality (c/a ratio) in Fe-0.77C(wt.%) alloy was investigated by means of pattern matching of electronbackscatter diffraction patterns combined with high angular resolution electronbackscatter diffraction analysis. It was found that the c/a ratio varies withina martensite block and between blocks. The c/a variation within a block isparticularly evident in the vicinity of grain boundaries and shear strains arealso present in addition to tetragonal distortion. The c/a variation betweenblocks is more apparent than that within a block. The lattice parameterfrequency profile predicted by our approach well matches with the X-raydiffraction profile from the same material by assuming reasonable residualstrain acting on a- and b-axes. The heterogeneities of the crystal distortionare brought by a decrease and scatter in solid solution carbon and in carbonordering as a result of the martensite transformation sequence as well asheterogeneous residual strain.

High resolution electron backscatter diffraction study on the  heterogeneities of tetragonal distortion in Fe-C martensite at the  microstructural scale