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Application of CALPHAD Method in the Preparation for Co-based Bond Coating Alloys
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1.Division of Rare Metals Metallurgy and Materials,General Research Institute for Nonferrous Metals;2.China

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    Abstract:

    The effects of alloying elements on phase equilibria in Co-based bond coating alloys are predicted by CALPHAD method. The results show that Al significantly influences on the precipitation amounts of β` and γ, and Cr has a definite effect on the precipitation of σ. The appropriate contents of Al and Cr elements are determined to be around 13% and 22%, respectively. The results of calculated phase formations and phase changes as a function of temperature are extensively discussed, which indicats that γ begins to precipitate from the matrix β` at 1208 ℃ and reaches the highest content at 974 ℃, then the σ will precipitat. According to the phase transformation, the heat treatment process of the alloy was formulated, dissolved at 1300 ℃ and aged at 1 000 ℃. The alloy samples were prepared by vacuum induction melting. Segregation and the amorphous structure in as-cast alloys was eliminated after the above heat treatment, and the two-phase structure, β`+ γ, of the commercial target is obtained.

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[Zhang Zhao, Chu Maoyou, Shen Jianyun, Liu Yuyang, Bai Xue. Application of CALPHAD Method in the Preparation for Co-based Bond Coating Alloys[J]. Rare Metal Materials and Engineering,2020,49(5):1657~1664.]
DOI:10.12442/j. issn.1002-185X.20190248

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History
  • Received:March 25,2019
  • Revised:May 27,2019
  • Adopted:May 30,2019
  • Online: June 05,2020
  • Published: