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An Investigation of High Temperature Behavior and Constitutive Model of Ti-6Al-4V-0.1Ru Titanium Alloy Used for Oil Country Tubular Goods
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The National Natural Science Foundation of China (2016ZX05020-002);the Shaanxi Innovation Capability Support Program(2018KJXX-046)

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    Abstract:

    The hot deformation behavior of Ti-6Al-4V-0.1Ru titanium alloy was investigated by isothermal compression on Gleeble-3500 thermal simulator under the conditions of deformation temperature ranging from 800℃ to 1100℃ and strain rate ranging from 0.01 s-1 to 10 s-1. The results revealed that the peak stress of Ti-6Al-4V-0.1Ru titanium alloy increased with decreasing the deformation temperature and increasing the strain rate, the softening mechanism was dynamic recovery below 950℃ and dynamic recrystallization above 950℃. The constitutive equation of Ti-6Al-4V-0.1Ru alloy was calculated by a linear regression analysis in two phase regions in the form of Arrhenius-type relationships. It is found that the apparent activation energies were calculated to be 720.477 kJ/mol and strain rate sensitivity index was 4.809. By introducing the influence of strain on the material constants of α, n, A and Q, the fixed constitutive model of flow stress was established, through comparing the experimental and predicted results, the correlation coefficient reached 96.9%, it was illustrated that this constitutive model had better prediction precision.

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[刘强,baiqiang, tianfeng, yuyang, huisongxiao, songshenying. An Investigation of High Temperature Behavior and Constitutive Model of Ti-6Al-4V-0.1Ru Titanium Alloy Used for Oil Country Tubular Goods[J]. Rare Metal Materials and Engineering,2020,49(1):177~184.]
DOI:10.12442/j. issn.1002-185X.20181182

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History
  • Received:November 25,2018
  • Revised:January 29,2019
  • Adopted:February 22,2019
  • Online: February 16,2020
  • Published: