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Hot deformation behavior and process parameter optimization of Ti60 alloy
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1.Nanchang Hangkong University,Nan,chang,330063;2.China

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    Abstract:

    The isothermal compression tests of Ti60 alloy were conducted on the Thermecmaster-Z thermal simulator at deformation temperature of 600~950℃, strain rate 0.001~10s-1. The hot deformation behavior of Ti60 alloy were investigated, by analyzing the flow stress behavior, calculating the strain rate sensitive exponent m and strain hardening exponent n, along with the processing map and deformation microstructure, to optimize processing parameter. The results show that the flow stress-strain curve of Ti60 alloy presents flow steady state and flow softening respectively at different processing parameters. The strain rate sensitivity exponent m increases with the increase of deformation temperature and decrease of strain rate. The strain hardening exponent n decreases with the increase of deformation temperature. With the increase of strain rate, n increases in the low strain rate (0.001~0.1s-1) and decreases in the high strain rate (1~10s-1). With the increase of strain, n decreased slowly at the low strain rate (0.001~0.1s-1), the high temperature (800~950℃), while which decreased significantly at the high strain rate (1~10s-1) , the high temperature section (800~950℃) and all the strain rates (0.001~10s-1), the low temperature (600~750℃). Ti60 alloy has two peak power dissipation efficiency regions, whose corresponding processing parameter Windows : temperature 725~875℃, strain rate ≤0.003s-1 and temperature 875~938℃, strain rate ≤0.04s-1, respectively. Considering the flow stress behavior, strain rate sensitivity exponent m, strain hardening exponent n and processing map, the optimal thermal processing parameters of Ti60 alloy: temperature 800~875℃, strain rate 0.001~0.003s-1, or temperature 875~938℃, strain rate 0.001~0.04s-1.

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[Wang Tianxiang, Lu Shiqiang, Wang Kelu, OUYANG Delai, Yao Quan. Hot deformation behavior and process parameter optimization of Ti60 alloy[J]. Rare Metal Materials and Engineering,2020,49(10):3552~3561.]
DOI:10.12442/j. issn.1002-185X.20190901

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History
  • Received:October 31,2019
  • Revised:December 10,2019
  • Adopted:December 11,2019
  • Online: November 04,2020
  • Published: