V. G. Sorokin

Study of short term creep in fast air flows, allowing for the variable loads arising from vibrations

Conclusions1.An increase in the air-flow velocity from M=0.94 to M=1.6 for the OT4 alloy at 500°C and from M=0.7 to M=1.6 for the VZh98 alloy at 1000°C accelerates creep and shortens the total time-to-failure as a result of an intensification of the corrosion-erosion action of the flow. The degree of deformation at the point of failure diminishes by a factor of 2 to 2.5 as compared with tests in still air.2.An increase in the angle of attack at a constant air-flow velocity (M=0.94) for these alloys accelerates the creep rate as a result of an increase in the average statistical value of the dynamic stress component.

Short-term creep of nickel in a high-speed air stream

Conclusions1.At 700–800°C the creep resistance of commercially pure nickel is higher in still air than in vacuum. This is due to the strengthening influence of the oxide film, which prevents the escape of dislocations to a free surface.2.In high-speed air the creep rate of nickel increases sharply due to the corrosion — erosion effect. The time to failure is shortened by a factor of 5–13.