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Acier biphasé
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ISBN10: 6200757623
ISBN13: 9786200757623
Publisher: Editions Notre Savoir
Published: Jul 26 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786200757623
Publisher: Editions Notre Savoir
Published: Jul 26 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: French
Ce travail présente la caractérisation microstructurale et l'évaluation des propriétés mécaniques d'un acier présentant différentes microstructures biphasées, obtenues par trempe à partir d'un acier ferritique-perlitique de grade LNE 500. Sa région intercritique et les phases existantes, en fonction de la température, ont été déterminées à l'aide du logiciel THERMOCALC . À partir de ces résultats, des échantillons ont été trempés à différentes températures afin d'obtenir diverses fractions volumétriques de ferrite et de martensite. La caractérisation microstructurale a été réalisée à l'aide de métallographies qualitatives et quantitatives. Les propriétés mécaniques ont été déterminées à l'aide d'essais de dureté, d'impact et de traction uniaxiale, qui ont fourni des paramètres tels que la contrainte d'écoulement, la limite de résistance à la traction et l'allongement total et uniforme, ainsi que l'exposant d'écrouissage et le coefficient de résistance de l'acier traité. Les résultats ont montré que les traitements thermiques de trempe ont produit différentes microstructures. La présence accrue de la phase martensitique contribue à améliorer les propriétés mécaniques de l'acier trempé, telles que la dureté, l'énergie absorbée par impact et la résistance mécanique sans perte de ductilité.
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