Effect of intermediate annealing on microstructure and micro-hardness of the alloy obtained H20N80 after severe plastic deformation

L.R. Zubairov1, V.A. Popov1, V.N. Danilenko1
1Institute for Metals Superplasticity Problems of Russian Academy of Sciences, 39, Khalturin Str., Ufa, Russia, 450001
The effect of intermediate annealing during severe plastic deformation on evolution nanocrystalline structure and mi-crohardness of Ni-Cr alloy. It is shown that the microhardness saturates at strain correspondent to ten whole revolutions. Intermediate annealing nickel chromium alloy subjected to 5 revo-lution and consequent HPT for 10 revolution leads to increase of saturation level comparing to HPT Ni-Cr alloy strained for 15 whole revolutions microhardness increases above the saturation value. This result is apparently due to the increase in the length of equilibrium grain boundaries after annealing, which contribute to defect formation kinetics during subsequent deformation.
Received: 10 December 2012   Revised: 12 December 2012   Accepted: 19 December 2012
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