J. Mater. Sci. Technol. ›› 2021, Vol. 71: 44-54.DOI: 10.1016/j.jmst.2020.08.043

• Research Article • Previous Articles     Next Articles

Microstructural evolution and mechanical properties of NiCrAlYSi+NiAl/cBN abrasive coating coated superalloy during cyclic oxidation

Y.D. Liua,b, J. Sunc, W. Lia,b, W.S. Gua,b, Z.L. Peib,*(), J. Gongb, C. Sunb,*()   

  1. a School of Materials Science and Engineering, University of Science and Technology of China, 72 Wenhua Road, Shenyang 110016, China
    b Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
    c Advanced Research Institute for Multidisciplinary Science, Qilu University of Technology (Shandong Academy of Sciences), 3501 Daxue Road, Jinan 250353, China
  • Received:2020-04-09 Revised:2020-07-09 Accepted:2020-07-13 Published:2021-04-30 Online:2021-04-30
  • Contact: Z.L. Pei,C. Sun
  • About author:csun@imr.ac.cn (C. Sun).
    * E-mail addresses: zlpei@imr.ac.cn (Z.L. Pei), csun@imr.ac.cn (C. Sun).

Abstract:

Cyclic oxidation behavior of NiCrAlYSi + NiAl/cBN abrasive coating at 900 °C and the mechanical properties of the coating-substrate system were investigated. Results indicated that elemental interdiffusion occurred between the coating and substrate, which caused the formation of interdiffusion zone (IDZ) and secondary reaction zone (SRZ) during aluminization, while their compositions and structures changed with oxidation. AlN interfacial layer formed at cBN/metallic matrix interface during aluminization, while it transformed into multilayer oxides during oxidation. Due to the microstructural evolution of these interfaces, the fracture behavior and bending toughness of the system changed greatly during three-point bending tests. Besides, the damage mechanisms were discussed.

Key words: Abrasive coating, Cyclic oxidation, TEM, Interface, Superalloy