EFFECT OF LOW-RATE ISOTHERMAL PLASTIC-DEFORMATION ON THE STRUCTURE AND PROPERTIES OF ZHS6KP NICKEL-ALLOY

ZhS6KP alloy is used in commercial production of blades of aircraft en gines pressed in Widin presses. Standard heat treatment that consists in air hardening from 1220 degrees C (4 h) and aging at 950 degrees C for 2 h with cooling in air does not always provide an optimum combina tion of long-term strength and fatigue resistance for the alloy at 900 degrees C. In this connection, the possibility of improving the fatig ue resistance and the long-term strength while preserving the high lev el of short-term mechanical properties by conducting low-rate plastic deformation before the heat treatment is considered.