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The effect of finish rolling temperature (FRT) on the austenite- ()to-bainite () phase transformation is quantitatively investigated inhigh-strength C-Mn steels. In particular, the present study aims to clarify therespective contributions of the conditioning during the hot rolling and thevariant selection (VS) during the phase transformation to the inheritedtexture. To this end, an alternative crystallographic reconstruction procedure,which can be directly applied to experimental electron backscatter diffraction(EBSD) mappings, is developed by combining the best features of the existingmodels: the orientation relationship (OR) refinement, the local pixel-by-pixelanalysis and the nuclei identification and spreading strategy. Theapplicability of this method is demonstrated on both quenching and partitioning(Q&P) and as-quenched lath-martensite steels. The results obtained on the C-Mnsteels confirm that the sample finish rolled at the lowest temperature(829{\deg}C) exhibits the sharpest transformation texture. It is shown thatthis sharp texture is exclusively due to a strong VS from parent brass{110}<1-12>, S {213}<-3-64> and Goss {110}<001> grains, whereas the VS from thecopper {112}<-1-11> grains is insensitive to the FRT. In addition, astatistical VS analysis proves that the habit planes of the selected variantsdo not systematically correspond to the predicted active slip planes using theTaylor model. In contrast, a correlation between the Bain group to which theselected variants belong and the FRT is clearly revealed, regardless of theparent orientation. These results are discussed in terms of polygranularaccommodation mechanisms, especially in view of the observed development in thehot-rolled samples of high-angle grain boundaries with misorientation axesbetween <111> and <110> .

metallurgical and materials transactions a

Crystallographic reconstruction study of the effects of finish rolling  temperature on the variant selection during bainite transformation in C-Mn  high-strength steels