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Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents
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1.University of Science and Technology Liaoning;2.Institute of Metal Research,Chinese Academy of Sciences

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    Abstract:

    Three U720Li ingots with different B contents were produced by vacuum induction melting and afterwards they were fully homogenized. The effect of B on the isothermal oxidation behavior of as-homogenized U720Li alloy at 1100 ℃ was investigated by a discontinuous increasing weight method. After the homogenization treatment, extremely serious B depletion from the alloy matrix was found by ICP-AES, indicating that B could diffuse rapidly towards the oxide scale during high temperature air exposure (above 1100 ℃). The B addition decreased the oxidation rate and reduced the volume fraction of pores and the thickness of γ′ depleted layer. The scales formed on both low B and high B alloys consist of three layers, loose outer layer composed of (Ni/Co)O, TiO2 and complex spinel, compact intermediate layer is mainly Cr2O3 and discrete internal oxides are Al2O3+TiO2. It is deemed that B improves the oxidation resistance mainly by promoting the formation of a more continuous and protective Cr2O3 intermediate layer.

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[Zhao Guangdi, Zang Ximin, Li Wanming, Xue Chaochao. Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents[J]. Rare Metal Materials and Engineering,2020,49(6):2109~2117.]
DOI:10.12442/j. issn.1002-185X.20190394

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History
  • Received:May 09,2019
  • Revised:May 21,2019
  • Adopted:June 14,2019
  • Online: July 09,2020
  • Published: