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Title: 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
Authors: Li, X
Lu, SQ
Wang, KL
Fu, MW 
Li, ZX
Cao, CX
Keywords: Ti-alloy
Process optimization
Murty instability criterion
Deformation mechanism
Issue Date: 2008
Publisher: 中國學術期刊(光盤版)電子雜誌社
Source: 稀有金屬材料與工程 (Rare metal materials and engineering), 2008, v. 37, no. 4, p. 577-583 How to cite?
Journal: 稀有金屬材料與工程 (Rare metal materials and engineering) 
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 as well as deformation defect and deformation thermomechanical parameter is studied by 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 of 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.
ISSN: 1002-185X
EISSN: 1875-5372
DOI: 10.1016/S1875-5372(09)60015-1
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