Structure, Dynamic Cracking Resistance, and Crack Growth Micromechanism in Pipe Billets after Thermomechanical Treatment


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Abstract

The structure, dynamic cracking resistance, and micromechanisms of crack growth in initially highly tempered pipe billets made of structural carbon steel are studied after thermomechanical treatment, including cold plastic deformation by radial forging followed by annealing, under various conditions. The strength is found to be maximum after cold radial forging followed by annealing at 300°C. Cold radial forging and annealing at 600°C are shown to cause the formation of an ultrafine-grained structure with an average grain/subgrain size of ~900 nm. The structural features formed in both the axial and the transverse direction after cold radial forging have been revealed. The mechanism of crack growth after heat treatment and thermomechanical treatment has been studied. The fracture surface elements formed during dynamic-crackingresistance tests have been qualitatively analyzed.

About the authors

M. Yu. Simonov

Perm’ National Research Polytechnic University

Email: simonov@pstu.ru
Russian Federation, ul. Komsomol’skii pr. 29, Perm’, 614990

Yu. N. Simonov

Perm’ National Research Polytechnic University

Author for correspondence.
Email: simonov@pstu.ru
Russian Federation, ul. Komsomol’skii pr. 29, Perm’, 614990

G. S. Shaimanov

Perm’ National Research Polytechnic University

Email: simonov@pstu.ru
Russian Federation, ul. Komsomol’skii pr. 29, Perm’, 614990

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