Paper Title:

A New Approach to Calculate the γ Orientation Maps in Steels

Periodical Solid State Phenomena (Volume 160)
Main Theme Texture and Anisotropy of Polycrystals III
Edited by H. Klein and R.A. Schwarzer
Pages 203-210
DOI 10.4028/www.scientific.net/SSP.160.203
Citation Pierre Blaineau et al., 2010, Solid State Phenomena, 160, 203
Online since February, 2010
Authors Pierre Blaineau, Lionel Germain, Michel Humbert, Nathalie Gey
Keywords Electron Backscatter Diffraction (EBSD), Orientation Relationship, Parent Microtexture, Phase Transformation, Steel
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We propose a new approach to automatically reconstruct the  orientation map from the ’ map inherited by the bainitic or martensitic ’ phase transformation. Our model comprises two main steps (1) identification of reliable fractions of parent grains – each  fraction orientation is determined from neighbouring variants related to a unique  orientation with a low tolerance angle; (2) expansion of these fractions by collecting adjacent variants being in orientation relation (OR) with the  orientation of the initial fraction - using now a higher tolerance around the strict OR. The code was tested on ’ maps we built from reference  maps to control some characteristics of the transformation, i.e. the type of OR used, the spread around OR, the number of inherited variants. The results show that even with a large spread around OR, the shape and orientation of most of the  grains are accurately calculated.

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