Abstract
1. Fracture of the metal-vitreous enamel composites in the cyclic creep conditions takes place by delayed fracture. The main role in preparation of fracture is played by microplastic deformation in the metal/substrate as a result of cyclic pumping of the dislocations into the delayed clusters at the metal-enamel transition layers and of formation of the zones (or zone) of local overstresses. 2. In the temperature range, the fracture stresses of the composites in the cyclic creep conditions are on average 40–50 MN/m2 lower than in the short-term strength tests. 3. The resultant σ*f=f(T)t=const dependences may be used to design and calculate enameled chemical plant to determine thermal strength in cyclic temperature regimes.
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