Crystallographic Texture and Intervening Transformations

Saurabh Kundu and H. K. D. H. Bhadeshia


We examine here the case that in deformed austenitic stainless steels, the transformation texture should be calculated in two-stages. The first involves the transformation of austenite into ε-martensite, which then changes into body-centred cubic martensite. The procedure requires two fitting parameters, connected with the extent of variant selection. Our analysis shows that it may not be necessary to follow this procedure, with the texture adequately calculated by considering direct transformation into body-centred cubic martensite. Some comments are also made about the calculation of the interaction energy between the applied stress and martensite.

Scripta Materialia, 57 (2007) 869-872.

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A short audio interview of Harry Bhadeshia by Mathew Peet, on the content of the paper.

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MAP_STEEL_TEXTURE PROGRAM: Calculation of the crystallographic texture obtained when austenite transforms into martensite. The austenite itself can be textured.
MAP_STEEL_TEXTURE2 PROGRAM:To produce a non-random, crystallographically textured distribution of austenite grains.
MAP_STEEL_TEXTURE3 PROGRAM:Calculation of habit plane, shape deformation and orientation relationship between austenite and martensite or bainite, as a function of the correspondence matrix and the lattice invariant deformation.
MAP_STEEL_DIFFRACT_FERRITE PROGRAM:Calculation of Debye X-ray diffraction rings due to stress-induced transformation of polycrystalline austenite. The sample may be textured.
MAP_STEEL_DIFFRACT_AUSTENITE PROGRAM:Calculation of Debye X-ray diffraction rings for polycrystalline austenite. The sample may be textured.
MAP_STEEL_TRANS_PLASTICITY PROGRAM:Calculation of transformation strain and crystallographic orientation of the 24 variants of martensite or bainite that form in a singel grain of austenite in an arbitrary orientation.

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