The cliff-valley approach in the P-maps of PM/W joints for manufacturing the dual-alloys turbine disc

Yongquan Ning, Bingchao Xie, Zekun Yao, Hongzhen Guo, Mingwang Fu

Research output: Journal article publicationConference articleAcademic researchpeer-review


Published by Elsevier Ltd. 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, ϵopi: 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.
Original languageEnglish
Pages (from-to)1117-1122
Number of pages6
JournalProcedia Engineering
Publication statusPublished - 1 Jan 2017
EventInternational Conference on the Technology of Plasticity, ICTP 2017 - Hucisko, United Kingdom
Duration: 17 Sep 201722 Sep 2017


  • Dual-alloys turbine disc
  • Instability criterion
  • Microstructure evolution
  • Ni-based superalloys
  • Processing maps

ASJC Scopus subject areas

  • Engineering(all)

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