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Effects of Stacking Fault Energy and Temperature on Creep Performance of Ni-based Alloy with Different Co Contents
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1.AECC Commercial Aircraft Engine Co., Ltd, Shanghai 200241, China;2.Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

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High Technology Research and Development Program of China (N2014AA041701); National Natural Science Foundation of China (51171179, 51271174, 51331005, 11332010)

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    Abstract:

    The deformation microstructures of two Ni-based superalloys with different Co contents after creep tests at 650 °C/630 MPa, 725 °C/630 MPa and 760 °C/630 MPa were investigated by transmission electron microscopy (TEM), in order to study the influence of temperature and stacking fault energy (SFE) on the creep deformation mechanisms. The results show that the improvement in temperature enhances the creep mechanism transition from stacking faults to micro-twinning for the experimental single crystal alloys, suggesting that the formation of micro-twins is dependent on temperature. Moreover, increasing Co content as well as lowering SFE allow stacking faults or micro-twins to extend through the γ matrix and γ′ precipitates, which improve the creep resistance and prolong the creep life of the alloys.

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[Tian Chenggang, Tao Xipeng, Xu Ling, Cui Chuanyong, Sun Xiaofeng. Effects of Stacking Fault Energy and Temperature on Creep Performance of Ni-based Alloy with Different Co Contents[J]. Rare Metal Materials and Engineering,2021,50(10):3532~3537.]
DOI:10.12442/j. issn.1002-185X. E20200038

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History
  • Received:August 13,2020
  • Revised:December 22,2020
  • Adopted:January 15,2021
  • Online: October 28,2021
  • Published: October 25,2021