Dynamic Recovery and Recrystallization Behaviors of C71500 Copper-Nickel Alloy Under Hot Deformation
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JMEPEG https://doi.org/10.1007/s11665-020-05221-x
Dynamic Recovery and Recrystallization Behaviors of C71500 Copper-Nickel Alloy Under Hot Deformation Xin Gao
, Hui-bin Wu, Ming Liu, Yuan-xiang Zhang, and Xiang-dong Zhou
Submitted: 4 May 2020 / Revised: 21 September 2020 / Accepted: 21 September 2020 The isothermal compression test was employed to study the influence of deformation temperature and strain rate on the hot deformation behavior of C71500 copper-nickel alloy. According to the characteristics of dynamic recovery (DRV) and dynamic recrystallization (DRX), the Zener–Hollomon parameter lnZ is used as an important parameter to measure the influence of temperature and strain rate on the hot deformation behavior. The critical deformation conditions of DRX are determined by its different values. By analyzing the critical change of work hardening rate, the relationship among critical stress, peak stress and saturation stress transition point is obtained, and the dynamic mathematical model of the whole deformation process is established, which can predict the volume fraction of DRV and DRX well. The DRX nucleation and growth mechanism of C71500 copper-nickel alloy was determined by metallographic analysis. In the current work, the thermodynamic parameters are introduced to determine the critical conditions of the transformation of the deformation state, the transformation process of the hot deformation structure is predicted by the dynamic model, the nucleation and growth mechanism is analyzed, which could provide a complete set of important references for the DRV-based hot deformation alloy, and provide a theoretical basis for the control of the structure state after hot processing. Keywords
copper-nickel alloy, DRV, DRX, nucleation
1. Introduction Due to high thermal conductivity, corrosion resistance and good machining performance, copper-nickel alloys have been widely used in condenser and heat exchanger fields (Ref 1). The corrosion resistance of copper-nickel alloys can be improved by adding iron, thus making this material suitable for marine industrial types of equipment (Ref 2) such as heat exchangers, condensation pipes and valves (Ref 3). This material has been also used for other industries such as seawater desalination (Ref 4), ship engineering (Ref 5), chemical catalytic synthesis (Ref 6), petroleum exploitation (Ref 7, 8), hydrogen production (Ref 9), fuel cell industry (Ref 10). Till date, the studies of hot deformation behavior of nonferrous metals are mostly concentrated on aluminum (Ref 11), magnesium (Ref 12, 13), titanium (Ref 14, 15) and pure copper (Ref 16–18). There is little research on copper-nickel alloys. Xin Gao, Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China; General Research Institute of Nonferrous Metals, Beijing 100088, China; and Wuxi Longda metal material Co. Ltd, Jiangsu 214105, China; Hui-bin Wu, Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China; Ming Liu, State Ke
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