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Frontiers of Mechanical Engineering

ISSN 2095-0233

ISSN 2095-0241(Online)

CN 11-5984/TH

Postal Subscription Code 80-975

2018 Impact Factor: 0.989

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Front. Mech. Eng.    2019, Vol. 14 Issue (4) : 489-495    https://doi.org/10.1007/s11465-019-0554-x
RESEARCH ARTICLE
Hot deformation behavior of a novel bimetal consisting of BTW1 and Q345R characterized by processing maps
Pengtao LIU1,2,3, Lifeng MA2,3(), Weitao JIA2,3(), Tao WANG1, Guanghui ZHAO2,3
1. College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. Shanxi Provincial Key Laboratory of Metallurgical Equipment Design and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China
3. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
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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     
Corresponding Author(s): Lifeng MA,Weitao JIA   
Just Accepted Date: 23 August 2019   Online First Date: 09 October 2019    Issue Date: 02 December 2019
 Cite this article:   
Pengtao LIU,Lifeng MA,Weitao JIA, et al. Hot deformation behavior of a novel bimetal consisting of BTW1 and Q345R characterized by processing maps[J]. Front. Mech. Eng., 2019, 14(4): 489-495.
 URL:  
https://academic.hep.com.cn/fme/EN/10.1007/s11465-019-0554-x
https://academic.hep.com.cn/fme/EN/Y2019/V14/I4/489
Material Chemical composition/wt.%
C Si Mn Cr V Mo P S
BTW1 0.99 0.18 8.30 1.58 0.24 0.35 0.018 0.003
Q345R 0.15 0.35 1.40 ? ? ? 0.013 0.004
Tab.1  Chemical compositions of BTW1 and Q345R
Fig.1  Diagram of the test procedure.
Fig.2  True stress-strain curves of the BTW1/Q345R bimetal. (a) ε˙= 0.05 s?1; (b) ε˙= 0.5 s?1; (c) ε˙= 5 s?1; (d) ε˙= 15 s?1.
Fig.3  Calculation of the value of (a) n1 by fitting ln? ε˙ and lnσ, (b) b by fitting ln? ε˙ and σ, (c) n by fitting ln[sinh(aσ)] and ln? ε˙, and (d) Q by fitting ln[sinh(aσ)] and T.
Fig.4  Relationship between lnZ and ln?[sinh? (ασ)].
Fig.5  Processing maps of the novel BTW1/Q345R bimetal at strains of (a) 0.3, (b) 0.4, (c) 0.5, and (d) 0.6. The shaded areas indicate the unstable regions, and the dotted boxes indicate high-power-dissipation areas (Regions I, II, and III).
Fig.6  Microstructures and grain boundary of the novel BTW1/Q345R bimetal at (a) 1000 °C and 0.05 s?1, (b) 1000 °C and 15 s?1, (c) 1050 °C and 0.5 s?1, and (d) 1200 °C and 15 s?1.
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