Restoring the Initial Heat-Resisting Properties of Materials by Intermediate Heat Treating
JOINT INTELLIGENCE OBJECTIVES AGENCY WASHINGTON DC
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Numerous studies of the mechanism of the plastic deformation and the fracture of materials under conditions of creep at high temperatures have shown that the predominant roles in the phenomenon of stress rupture are played by the diffusion processes. In several studies, Ref. 1 for example, the reversibility of the stress-rupture process in the early stages of its development has been shown. A significant increase in the service life of materialsRef. 2Has been achieved by an intermediate heat treatment. In this case it was noted that at relatively low stresses the intermediate heat treatments could increase the service life of the material by several times. At the higher stresses the susceptibility appears to a lesser degree and the possibility of slowing the stress rupture process is reduced. The recovery of the properties after long-term operation of the material of turbine blades was shown by Glikman in his study of the variation of the damping decrement Ref 4.
- Metallurgy and Metallography
- Miscellaneous Materials