Abstract
Abstract In this study, the high-temperature deformation behaviour of a TC17 titanium alloy was investigated by isothermal hot compression tests in a wide range of temperatures (973–1223 K) and strain rates (0.001–10 s−1). Then, the constitutive equations of different phase regimes (α + β and single β phases) were developed on the basis of experimental stress-strain data. The influence of the strain has been incorporated in the constitutive equation by considering its effect on different material constants for the TC17 titanium alloy. Furthermore, the predictability of the developed constitutive equation was verified by the correlation coefficient and average absolute relative error. The results indicated that the obtained constitutive equations could predict the high-temperature flow stress of a TC17 titanium alloy with good correlation and generalization.
Highlights
The TC17 (Ti-5Al-2Sn-2Zr-4Mo-4Cr) titanium alloy, as a “beta-rich” α + β titanium alloy, has an attractive combination of characteristics including high strength, excellent corrosion resistance, superior fracture toughness and deep hardenability, which make it an ideal candidate material for fan blades and compressor disks in aircraft engines [1]
The influence of the strain has been incorporated in the constitutive equation by considering its effect on different material constants for the TC17 titanium alloy
The results indicated that the obtained constitutive equations could predict the high-temperature flow stress of a TC17 titanium alloy with good correlation and generalization
Summary
The TC17 (Ti-5Al-2Sn-2Zr-4Mo-4Cr) titanium alloy, as a “beta-rich” α + β titanium alloy, has an attractive combination of characteristics including high strength, excellent corrosion resistance, superior fracture toughness and deep hardenability, which make it an ideal candidate material for fan blades and compressor disks in aircraft engines [1]. Liu et al [1] investigated the constitutive model of a Ti17 titanium alloy with lamellar-type initial microstructure during hot deformation based on an orthogonal analysis. Ma et al [27] used ANN and regression models to predict the flow stress of the lamellar initial microstructures of Ti17 titanium alloys in α and β phase fields during thermal deformation. The main purpose of this investigation is to establish a suitable constitutive equation to predict the evaluated temperature flow stress of TC17 titanium alloys. To achieve this purpose in the current research, hot isothermal compression tests were carried out in a wide temperature range of 973–1223 K and a strain rate range of 0.001–10 s−1. Four and two temperatures were chosen in the α + β and single β phase regions, respectively
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