Hot deformation mechanism and process optimization for Ti-Alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si during α+β forging based on Murty criterion

Xin Li, Shiqiang Lu, Kelu Wang, Mingwang Fu, Zhenxi Li, Chunxiao Cao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

To investigate the hot deformation and optimize the process configuration for Ti-alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si in α+β forging process, the processing maps (P-maps) are developed for the alloy with α+β microstructure based on Murty instability criterion. The P-maps are constructed by the experimental results obtained through the isothermal and constant strain rate compression test at the temperatures of 780-990°C and the strain rates of 0.001-70 s-1. The relationship between the deformation mechanism, deformation defect and deformation thermomechanical parameter is studied by using the generated P-maps. The results show that the superplasticity deformation would occur at the temperature range of 780-990°C and the strain rate range 0.001-0.01 s-1. In addition, flow instability including cracks and cavities in β phase, flow localization and adiabatic shear bands would occur at the above mentioned temperature range under the strain rates greater than 0.01 s-1. According to the P-maps, microstructure and flow stress status, the preferred deformation thermomechanical parameters are identified, e.g. the temperature range of 850-940°C and the strain rate range of 0.001-0.01 s-1. The optimum deformation thermomechanical parameter is around the temperature of 900°C and the strain rate of 0.001 s-1.
Original languageEnglish
Pages (from-to)577-583
Number of pages7
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume37
Issue number4
DOIs
Publication statusPublished - 1 Apr 2008

Keywords

  • Deformation mechanism
  • Murty instability criterion
  • Process optimization
  • Ti-6.5Al-3.5Mo-1.5Zr-0.3Si
  • Ti-alloy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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