Hot deformation behavior of a novel bimetal consisting of BTW1 and Q345R characterized by processing maps

Abstract

Only a few studies have been conducted on the flow behavior of the novel BTW1/Q345R bimetal, which is widely used in coal equipment. In this work, compression tests were conducted on BTW1/Q345R bimetal at a temperature range of 950 °C–1200 °C and strain rates of 0.05, 0.5, 5, and 15 s⁻¹ by using a Gleeble-3800 thermomechanical simulator. A constitutive equation was validated by referring to the Arrhenius equation during the characterization of hot workability. The computed apparent activation energy of the BTW1/Q345R bimetal was 360 kJ/mol, and processing maps under different strain conditions were drawn. Analysis of the stress-strain relationship revealed that work hardening exerted a dominant effect on the thermal deformation of the BTW1/Q345R bimetal. The processing maps predicted that the optimal processing interval will increase with strain. Results showed that thermal deformation of the BTW1/Q345R bimetal should proceed when the temperature range varies from 1182 °C to 1200 °C and the strain rate interval is from 4.2 to 15 s⁻¹.

Keywords

BTW1/Q345R bimetal / constitutive equation / processing map / work hardening

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Acknowledgements

This work was supported by the Applied Basic Research Project of Shanxi Province, China (Grant Nos. 201701D121078 and 201701D221143) and the National Natural Science Foundation of China (Grant No. U1510131).

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2019 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature