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| Characterization of hot deformation behavior of wear-resistant steel BTW1 using processing maps and constitutive equations |
| Peng-tao Liu1,2,3 ? Qing-xue Huang1,2,3 ? Li-feng Ma2,3 ? Tao Wang1 |
| 1 College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China 2 Shanxi Provincial Key Laboratory of Metallurgical Equipment Design and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China 3 Heavy Machinery Engineering Research Center of the Ministry Education, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China |
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Abstract In order to predict flow instability of wear-resistant steel BTW1, the hot compressions of wear-resistant steel BTW1 were firstly performed at the temperature of 900�C1150 C and at the strain rate of 0.05�C15 s-1. Then, the constitutive relation was established based on Arrhenius-type hyperbolic sine equation. The results demonstrated that the flow stress depended on the deformation temperature and strain rate. When the deformation temperature kept constant, the flow stress increased as the strain rate increased. When the strain rate remained constant, the flow stress decreased as the temperature increased. The flow stresses calculated by constitutive equations were in a good agreement with experimental results. The apparent activation energy for deformation in the above processing region was estimated to be 369 kJ mol-1. A processing map could be obtained by the superimposition of an instability map on a power dissipation map. Based on the analysis of processing map and the microstructures, the rheological instability regimes of strain rate and temperature for hot deformation of wear-resistant steel BTW1 had been identified.
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Received: 04 September 2017
Published: 14 November 2018
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2018, Vol. 25 
