Influence of Equal Channel Angular Pressing and Quenching on Impact Strength and Fractures of Steel 09G2S
Abstract
We have considered the fracture features of steel 09G2S obtained by equal channel angular pressing (ECAP) with subsequent tempering and tested at different temperatures of impact test. It is shown that the thermomechanical treatment led to a significant increase in strength coupled with high resistance to impact fracture, including low temperature tests. Found that immediately after ECAP there is a sharp decrease in toughness, which is due to a change of the main destruction mechanism from viscous patching in a coarse-grained condition to brittle fracture by quasi-spalling in ultrafine-grained state. Subsequent thermal treatment of the material had an obvious relaxing effect on the structure of the steel subjected to severe plastic deformation by the ECAP method, allowing it to maintain high strength of the material with simultaneous increase of impact values. It is established that quenching and subsequent short time heating after ECAP increased the energy of destruction more than 12 times at room temperature and almost 20 times at –60°C.
About the Author
Maria Zakharovna Borisova
Institute of Physical and Technical Problems of the North SB RAS
Russian Federation
Russian Federation
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Review
For citations:
Borisova M.Z. Influence of Equal Channel Angular Pressing and Quenching on Impact Strength and Fractures of Steel 09G2S. Arctic and Subarctic Natural Resources. 2015;20(4):91-94. (In Russ.)
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