Publication Date:
2012-09-24
Description:
The kinetics of the γ′ phase dissolution have been studied at 1473 K and 1523 K (1200 °C and 1250 °C) for CMSX-4 ® alloy. Interrupted creep tests at 1323 K (1050 °C) and pure thermal aging at 1373 K (1100 °C) have been used to vary the initial γ′ morphology. Subsequent dissolution studies were conducted with or without an applied load. Differences in γ′ dissolution kinetics were observed between the dendrite cores and the interdendritic regions, resulting from the chemical microsegregations remaining after the standard heat treatments. It is shown that the initial γ′ morphology, the relaxation of the coherency stresses and the accumulated plastic strain are critical parameters controlling the dissolution kinetics. An increase of the accumulated plastic strain leads to an increase of the dissolution kinetics, whatever the location in the dendritic structure. In addition, once a given accumulated creep strain is reached prior to the dissolution tests ( i.e. , a given dislocations density), the dissolution kinetics are the same at 1473 K and 1523 K (1200 °C and 1250 °C). A modified equation of the recently developed Polystar model is proposed to incorporate the role of the accumulated plastic strain on the γ′ dissolution kinetics and to achieve a better predictability of the creep deformation under non-isothermal loading paths. Content Type Journal Article Pages 1-16 DOI 10.1007/s11661-012-1397-9 Authors Rémi Giraud, Turbomeca - SAFRAN Group, Département Matériaux, Procédés et Expertises, 64511 Bordes Cedex, France Zéline Hervier, Turbomeca - SAFRAN Group, Département Matériaux, Procédés et Expertises, 64511 Bordes Cedex, France Jonathan Cormier, Institut Pprime, CNRS—ENSMA—Université de Poitiers, UPR CNRS 3346, Département de Physique et Mécanique des Matériaux, ENSMA—Téléport 2, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope - Chasseneuil Cedex, France Gilles Saint-Martin, Turbomeca - SAFRAN Group, Département Matériaux, Procédés et Expertises, 64511 Bordes Cedex, France Florence Hamon, Institut Pprime, CNRS—ENSMA—Université de Poitiers, UPR CNRS 3346, Département de Physique et Mécanique des Matériaux, ENSMA—Téléport 2, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope - Chasseneuil Cedex, France Xavier Milhet, Institut Pprime, CNRS—ENSMA—Université de Poitiers, UPR CNRS 3346, Département de Physique et Mécanique des Matériaux, ENSMA—Téléport 2, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope - Chasseneuil Cedex, France José Mendez, Institut Pprime, CNRS—ENSMA—Université de Poitiers, UPR CNRS 3346, Département de Physique et Mécanique des Matériaux, ENSMA—Téléport 2, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope - Chasseneuil Cedex, France Journal Metallurgical and Materials Transactions A Online ISSN 1543-1940 Print ISSN 1073-5623
Electronic ISSN:
1543-1940
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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