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Title: The cliff-valley approach in the P-maps of PM/W joints for manufacturing the dual-alloys turbine disc
Authors: Ning, Y
Xie, B
Yao, Z
Guo, H
Fu, MW 
Issue Date: 2017
Source: Procedia engineering, 2017, v. 207, p. 1117-1122
Abstract: In present work, hot deformation behavior of Ni-based dual-alloys has been investigated using processing map (P-map) at the temperatures of 1020-1140°C and strain rates of 0.001-1.0s-1. The processing map approach was further adopted to optimize hot forging process of dual-property turbine disc. Optimum processing condition is (Topi: 1140°C, ϵ opi: 1.0s-1) with the peak efficiency of 0.55 for processing dual-alloys. In addition, a new method to find the instability criterion (Cliff-Valley) from power dissipation map has been reported. The "cliff" and "valley" features are the sufficient condition of flow instability. The results indicate that P-map approach could be used to optimize the forging parameter for dual-alloys.
Keywords: Dual-alloys turbine disc
Instability criterion
Microstructure evolution
Ni-based superalloys
Processing maps
Publisher: Elsevier Ltd
Journal: Procedia engineering 
EISSN: 1877-7058
DOI: 10.1016/j.proeng.2017.10.1069
Description: International Conference on the Technology of Plasticity, ICTP 2017, University of Cambridge, UK, 17-22 September, 2017
Rights: © 2017 The Authors.
This is an open access article under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
The following publication Ning, Y., Xie, B., Yao, Z., Guo, H., & Fu, M. W. (2017). The cliff-valley approach in the P-maps of PM/W joints for manufacturing the dual-alloys turbine disc. Procedia engineering, 207, 1117-1122 is available at https://doi.org/10.1016/j.proeng.2017.10.1069.
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