Abstract
The effect of annealing temperatures on the resistance to delayed fracture and cyclic endurance of various regions of heat-affected zone of alloy OT4 is studied. Low-temperature maxima of resistance to delayed fracture and of cyclic endurance are discovered for the regions of heat-affected zone heated above the temperature of polymorphic transformation. The highest operating capacity under cyclic and long-term static loads is determined in the regions exposed to heating above 1000°C.
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