ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 26    No. 1    January 2016

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Effects of initial δ phase (Ni3Nb) on hot tensile deformation behaviors and material constants of Ni-based superalloy
Yong-cheng LIN1,2,3, Min HE1,3, Ming-song CHEN1,3, Dong-xu WEN1,3, Jian CHEN4
(1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. Light Alloy Research Institute, Central South University, Changsha 410083, China;
3. State Key Laboratory of High Performance Complex Manufacturing,
Central South University,Changsha 410083, China;
4. Key Laboratory of Efficient and Clean Energy Utilization,School of Energy and Power Engineering,
Changsha University of Science and Technology, Changsha 410114, China
)
Abstract: Effects of initial δ phase (Ni3Nb) on the hot tensile deformation behaviors and material constants of a Ni-based superalloy were investigated over wide ranges of strain rate and deformation temperature. It is found that the true stress-true strain curves exhibit peak stress at a small strain, and the peak stress increases with the increase of initial δ phase. After the peak stress, initial δ phase promotes the dynamic softening behaviors, resulting in the decreased flow stress. An improved Arrhenius constitutive model is proposed to consider the synthetical effects of initial δ phase, deformation temperature, strain rate, and strain on hot deformation behaviors. In the improved model, material constants are expressed as the functions of the content of initial δ phase and strain. A good agreement between the predicted and measured results indicates that the improved Arrhenius constitutive model can well describe hot deformation behaviors of the studied Ni-based superalloy.
Key words: Ni-based superalloy; hot deformation; initial δ phase; constitutive model; material constants
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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