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Bruzy, N., Coret, M., Huneau, B., Kermouche, G., Mondon, M., Bertrand, E. & Stainier, L. (2019) Mesoscopic Strain Fields Measurement During the Allotropic alpha - gamma Transformation in High Purity Iron. Experimental Mechanics, 59 1145–1157.
Added by: Richard Baschera (2019-10-17 10:07:07) Last edited by: Richard Baschera (2019-10-17 10:08:15) |
| Type de référence: Article DOI: 10.1007/s11340-019-00525-z Clé BibTeX: Bruzy2019 Voir tous les détails bibliographiques  |
Catégories: ID2M Créateurs: Bertrand, Bruzy, Coret, Huneau, Kermouche, Mondon, Stainier Collection: Experimental Mechanics |
Consultations : 1/428
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| Résumé |
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The allotropic phase change from ferrite to austenite represents a moment of massive interplay between the microstructural and mechanical states of iron. The difference of compacity between the two phases induces a microplastic accommodation in the material at grain scale. However, mechanical heterogeneities resulting from the transformation process remain challenging to characterise due to the high temperature conditions it is associated with. We developed experimental equipment for in situ observation of alpha - gamma and gamma - alpha transformations. Images of the surface of an iron sample taken by an optical camera were used as input for a Digital Image Correlation (DIC) routine. Special care was taken to maximize image resolution to capture sub-grain phenomena. Observations show that, at the mesoscopic scale, shear strain fields exhibit strong localisations that are evidence of transformations that are occurring.
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