Abstract
It is shown that the intensive warm rolling leads to the formation of ultrafinegrained (UFG) structure with an average grain size 0.5 in transverse and to two times increase in strength by comparison to the initial coarse-grained (CG) state. Impact tests have shown increase of fracture strength in fibrous UFG structure at negative temperatures. It was also established that the type of fracture in UFG state remains ductile until -80 deg. whereas in CG material a brittle rupture is observed at this temperature. <br />
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