CREEP STRENGTH AND HIGH-TEMPERATURE DAMAG E OF INCOLOY-800-HT AFTER SOLUTION TREATMENT AND HIGH-TEMPERATURE AGING

In the present work the influence of heat treatment, especially for hi gh temperature ageing, on the creep strength and the intercrystalline creep damage of the iron base alloy Incoloy 800 HT (X10 Ni-CrAlTi 32 2 0 HT) is examined. For this purpose the properties and the damage beha viour, particulary the magnitude of damage, of the preaged materials a l two test temperatures are compared to the solution treated material after creep failure. The results of metallographic investigations (opt ical, SEM and TEM) were used to study the influence of long therm agei ng on the damage and the microstructure. The damage is quantified by u sing a damage parameter which is derived from the creep crack density and the length.