Abstract
1. We established relationships between the initiation and development of strain microrelief in an iron-nickel alloy (ni+Fe=98.4%) at 20−500°; and elongation rate of 105%\h. Intragranular shear processes develop intensively up to and including 400°, with a large number of slip traces in the grains. At 500° shear processes within the grains are partially prevented by the development of intergranular deformation, which is manifest in the corresponding microrelief of the grain boundaries. 2. The deformation mechanism of the alloy investigated undergoes a fundamental change at 500° due to the intensive deformation processes in the grain boundaries. 3. The Fe-Ni alloy should be rolled with small deformation in each pass to prevent heating of the material (to 500°) in the contact area, since this may result in cracking. The highest temperature in the contact area of the pipe should not exceed 400°. This procedure has been adopted at the Pervoural'skii Novotrubnyi Plant.
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