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Isothermal oxidation behavior of W-free Co���Ni���Al-based superalloy at high temperature

Journal Article


Abstract


  • Co-based superalloys with the advantages of high melting point, high-temperature mechanical properties, and large resistance under hot corrosion environment are potential candidates for turbine engine components. The isothermal oxidation behavior of Co���Ni���Al-based superalloy with the addition of Mo and Cr in dry air at 1073 and 1173 K was investigated. The results showed that similar three-layer oxides structures were composed of Co-containing oxides, complex oxides rich in Co and Al, and Al2O3 layer formed on both 2Mo and 2Cr Co���Ni���Al-based superalloys, and Mo-containing oxides also existed in the subsurface. The oxides in the outer layer transferred from Co3O4 to denser CoO with the increase in temperature. The ��'-free zone formed under the Al2O3 layer due to the depletion of Al. Co���Ni���Al-based superalloys need to conquer a large energy barrier at an earlier stage of oxidation and exhibit good oxidation resistance at 1073 K.

Publication Date


  • 2022

Citation


  • Gao, Q., Shang, H., Ma, Q., Zhang, H., Zhang, H., Li, H., & Liu, Z. (2022). Isothermal oxidation behavior of W-free Co���Ni���Al-based superalloy at high temperature. Materials and Corrosion, 73(4), 513-525. doi:10.1002/maco.202112789

Scopus Eid


  • 2-s2.0-85118352944

Start Page


  • 513

End Page


  • 525

Volume


  • 73

Issue


  • 4

Place Of Publication


Abstract


  • Co-based superalloys with the advantages of high melting point, high-temperature mechanical properties, and large resistance under hot corrosion environment are potential candidates for turbine engine components. The isothermal oxidation behavior of Co���Ni���Al-based superalloy with the addition of Mo and Cr in dry air at 1073 and 1173 K was investigated. The results showed that similar three-layer oxides structures were composed of Co-containing oxides, complex oxides rich in Co and Al, and Al2O3 layer formed on both 2Mo and 2Cr Co���Ni���Al-based superalloys, and Mo-containing oxides also existed in the subsurface. The oxides in the outer layer transferred from Co3O4 to denser CoO with the increase in temperature. The ��'-free zone formed under the Al2O3 layer due to the depletion of Al. Co���Ni���Al-based superalloys need to conquer a large energy barrier at an earlier stage of oxidation and exhibit good oxidation resistance at 1073 K.

Publication Date


  • 2022

Citation


  • Gao, Q., Shang, H., Ma, Q., Zhang, H., Zhang, H., Li, H., & Liu, Z. (2022). Isothermal oxidation behavior of W-free Co���Ni���Al-based superalloy at high temperature. Materials and Corrosion, 73(4), 513-525. doi:10.1002/maco.202112789

Scopus Eid


  • 2-s2.0-85118352944

Start Page


  • 513

End Page


  • 525

Volume


  • 73

Issue


  • 4

Place Of Publication