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Effect of Heat Treatment on Microstructures and Properties of Ti90 Alloy
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    Abstract:

    The effects of annealing temperature, cooling rate and multiple annealing process on microstructures, tensile properties and corrosion behavior of a new near-α titanium alloy-Ti90 were comparatively investigated.The results show that when specimens were annealed in the two-phase region,as the annealing temperature increased, the deformed structure gradually spheroidized with a decreased fraction of primary α phase (αp) and an increased fraction of β-transformation structure (βt), in which the secondary α phase (αs) precipitated and coarsened gradually. Those changes finally rose up to the reduced strength and improved plasticity. When annealing in single β phase zone, a fine lamellar microstructure was obtained with fairly coarse original β grains, which resulted in a sharp decrease in the plasticity of the alloy. After water cooling, the acicular α′ martensite phase was precipitated inside β grains, which significantly improved the strength while maintaining good plasticity. With multiple annealing, the size of αp and βt increased, and αs coarsened, leading to a simultaneous decrease in the strength and plasticity of the alloy. The polarization curve test results show that Ti90 alloys with four different microstructures all exhibite passivation behavior in 3.5% NaCl solution with low passivation current density, which implicates a good corrosion resistance. The corrosion resistance of different microstructures is in the order of bimodal microstructure > equiaxed microstructure > Lamellar microstructure.

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[王可,Zhao Yongqing, Jia Weiju, Hou Zhimin, Li Silan, Mao Chengliang. Effect of Heat Treatment on Microstructures and Properties of Ti90 Alloy[J]. Rare Metal Materials and Engineering,2021,50(2):552~561.]
DOI:10.12442/j. issn.1002-185X.20200612

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History
  • Received:August 18,2020
  • Revised:September 03,2020
  • Adopted:September 18,2020
  • Online: March 09,2021
  • Published: