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The method of experimental evaluation of thermal resistance of deposited specimens was updated. The new method allows evaluating the nature of propagation of thermal fatigue cracks across the thickness of deposited layer, as well as the effect of deposition of intermediate layers of different composition on thermal resistance of specimens. Using the updated procedure, the investigations of effect of deposition of a plastic sublayer by wire Sv-08A on thermal resistance of specimens, deposited by flux-cored wires PP-Np35V9Kh3GSF and PP-Np-25Kh5FMS, which are most widely used for restoration and strengthening of hot mill steel rolls, were carried out. Hardfacing of the plastic sublayer allowed increasing the general thermal resistance of deposited specimens by 1.2—1.5 times. In addition, it was found that the plastic sublayer arrests the propagation of thermal fatigue cracks into the base metal, thus preventing, to a certain degree, the fracture of the deposited part. 6 Ref., 1 Table, 5 Figures.

Investigation of thermal resistance of deposited metal designed for restoration of mill rolls