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| Hot Deformation Behavior of GH738 for A-USC Turbine Blades |
| Li WANG1, 2, Gang YANG2, Ting LEI3, Shu-biao YIN1, Lu WANG2 |
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2. Central Iron and Steel Research Institute, Beijing 100081, China
3. Kunming Metallurgy College, Kunming 650033, Yunnan, China |
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Abstract The hot deformation characteristics of GH738 superalloy over the temperature range of 1 000 ��C to 1 200 ��C and strain range of 0.01 s.1 to 10.0 s.1 under a strain of 1.0 s.1 were investigated through hot compression tests with a Gleeble-1500 simulation machine. The flow stress reached peak value before flow softening occurred. The average apparent activation energy (Q) of GH738 was calculated to be 430 kJ/mol, and the stress index (n) is approximately 4.08. The processing map was developed based on flow stress data and dynamic materials model (DMM). The map shows a dynamic recrystallization (DRX) domain in 1 050 ��C to 1 150 ��C and 0.01 s.1 to 1.0 s.1 strain rate range with a peak efficiency of 45%, which is considered to be the optimum region for hot working. Moreover, the materials undergo flow instability in the temperature range of 1 000 ��C to 1 050 ��C and strain range of 1.0 s.1 to 10.0 s.1, and adiabatic shear bands can be observed in this domain.
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Received: 31 July 2014
Published: 09 November 2015
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| Fund:national high technology research and development program (��863�� program) of China |
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Corresponding Authors:
Wang Li
E-mail: wangli_1245@163.com
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2015, Vol. 22 
