Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (3): 030201 doi: 10.13538/j.1001-8042/nst.26.030201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Improving oxidation resistance of Ni-16Mo-7Cr-4Fe nickel-based superalloy by yttrium microalloying

LI Xiao-Li,1 HE Shang-Ming,2 ZHOU Xing-Tai,1 LI Zhi-Jun,1 ZOU Yang,1 LI Ai-Guo,1 and YU Xiao-Han1   

  1. 1Shanghai Institute of Applied Physics, China Academy of Sciences, 2019 Jialuo Road, Shanghai 201800, China
    2Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics,
  • Supported by:

    Supported by the program of International S&T Cooperation (No. 2014DFG60230), the National Natural Science Foundation of China (Nos. 51371189 and 51371188), Science and Technology Commission of Shanghai Municipality (No. 11JC1414900) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

LI Xiao-Li, HE Shang-Ming, ZHOU Xing-Tai, LI Zhi-Jun, ZOU Yang, LI Ai-Guo, and YU Xiao-Han. Improving oxidation resistance of Ni-16Mo-7Cr-4Fe nickel-based superalloy by yttrium microalloying.Nuclear Science and Techniques, 2015, 26(3): 030201     doi: 10.13538/j.1001-8042/nst.26.030201

Abstract:

Microstructure and oxidation behavior of modified Ni-16Mo-7Cr-4Fe alloys by yttrium microalloying were investigated by scanning electron microscopy, transmission electron microscopy, grazing incident Xray diffraction and synchrotron radiation X-ray fluorescence. M6C and Ni17Y2 phases were observed and the amount of Ni17Y2 increased with yttrium concentration. When the yttrium concentration increased to 0.43 wt.%, some Ni17Y2 chains and multi phase regions containing Ni17Y2, M6C and phase appeared, which is harmful for the oxidation resistance. The alloy containing 0.05wt.% yttrium showed the best oxidation resistance, which derives its oxidation resistance from the adequate concentration of yttrium in the solid-solution ( phase), the formation of the protective layer of YCrO3 and chromia oxide and the strengthening effect of yttrium on oxide boundaries.

Key words: Nickel-based superalloy, Molten salt reactor, Rare earth yttrium, Microstructure, Oxidation, X-ray fluorescence