Abstract
Delta-Phase behaviour has important effect on mechanical properties in Alloy718. Structure control on a-phase behaviour by forging and followed heat treatment processing has been conducted in this research, simultaneously different quantity, morphology and distribution of b-phase have been achieved in turbine disk fabrication. Experimental results indicate that 6 -phase behaviour has obvious influence on crack propagation. In certain range a-phase has retardation effect on crack propagation. Crack propagation mechanism and failure analyses under creep and fatigue conditions have been discussed also. Superalloys 718, 625,706 and Various Derivatives Edited by EA. Loria The Minerals, Metals&Materials Society, 1994
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