Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-283-C7-288
Heat treatment structure modification of wrought nickel based superalloy and its creep resistanceJ. ZRNÍK1 and V. VRCHOVINSKÝ2
1 Technical University of Ko[MATH]ice, Department of Material Science Park, komenského 11, 040 02 Ko[MATH]ice, Slovakia
2 Technical University of Kosice, Department of Material Science Park, komenského 11, 040 02 Kosice, Slovakia
The effect of structure modification on creep characteristics of nickel based superalloy EI 698 VD has been studied. The substructure changes were caused by variation of the temperature and time parameters in solution treatments and in precipitation annealing process of the alloy. Through the change of gamma prime morphology and extent of M23C6 carbide precipitation on grain boundaries the creep strength and plastic characteristics were influenced. Significant decrease of lifetime was accompanied with remarkable increase of relative proportion of intercrystalline cleavage fracture mechanisms.
© EDP Sciences 1993