[Suivi de grains individuels lors de transformations de phases à lʼétat solide par microscopie 3DXRD]
Les propriétés mécaniques des métaux dépendent fortement de leur microstructure, qui est formée lors de leur production et procédés. La compréhension des mécanismes complexes sous-jacents aux cinétiques de germination et croissance lors de transformations de phases à lʼétat solide dans les aciers est dʼune importance vitale pour contrôler leurs microstructures. La cinétique de formation de grains individuels dans le volume dʼun acier peut être mesurée in situ grâce à la microscopie tri-dimensionnelle à diffraction de rayons X (3DXRD) au synchrotron européen ESRF. Cette technique permet de mesurer simultanément la fraction transformée, le taux de germination et la vitesse de croissance de grains individuels. Nous présentons dans cet article des mesures uniques de taux de germination et de croissance de grains individuels dʼausténite et de ferrite.
The mechanical properties of metals strongly depend on the microstructure, which is formed during their production and processing. Understanding the underlying mechanisms of the nucleation and growth kinetics during solid-state phase transformations in steel is of vital importance to control its microstructure. The kinetics of individual grains in the bulk of steel can be measured in situ with the three-dimensional X-ray diffraction microscopy (3DXRD) at the European synchrotron radiation facility (ESRF). Simultaneously the fraction transformed, the nucleation rate, and the growth rate of individual grains can be measured. Unique in situ measurements of nucleation and growth rates of individual austenite and ferrite grains are presented.
Mot clés : 3DXRD, Microstructure, ESRF
S. Eric Offerman 1 ; Hemant Sharma 1
@article{CRPHYS_2012__13_3_268_0,
author = {S. Eric Offerman and Hemant Sharma},
title = {Following individual grains during solid-state phase transformations with {3DXRD} microscopy},
journal = {Comptes Rendus. Physique},
pages = {268--279},
publisher = {Elsevier},
volume = {13},
number = {3},
year = {2012},
doi = {10.1016/j.crhy.2011.12.002},
language = {en},
}
TY - JOUR AU - S. Eric Offerman AU - Hemant Sharma TI - Following individual grains during solid-state phase transformations with 3DXRD microscopy JO - Comptes Rendus. Physique PY - 2012 SP - 268 EP - 279 VL - 13 IS - 3 PB - Elsevier DO - 10.1016/j.crhy.2011.12.002 LA - en ID - CRPHYS_2012__13_3_268_0 ER -
S. Eric Offerman; Hemant Sharma. Following individual grains during solid-state phase transformations with 3DXRD microscopy. Comptes Rendus. Physique, Volume 13 (2012) no. 3, pp. 268-279. doi : 10.1016/j.crhy.2011.12.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2011.12.002/
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