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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (6): 424073-424073.doi: 10.7527/S1000-6893.2020.24073

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Effect of stress on precipitated phases in DD5 single crystal superalloy during stress rupture tests

LV Peisen1, GAO Qiang1, LI Changjin2, LIU Lirong1, ZHANG Mingjun3, PENG Zhijiang3   

  1. 1. School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
    2. Jinzhou Jietong Railroad Machinery Co. Ltd, Jinzhou 121019, China;
    3. AECC Shenyang Liming Aero-Engine Co. Ltd, Shenyang 110043, China
  • Received:2020-04-08 Revised:2020-04-27 Online:2021-06-15 Published:1900-01-01
  • Supported by:
    Funded by the Key Laboratory of Advanced High-temperature Structural Materials for National Defense Science and Technology (6142903180104)

Abstract: The precipitation of second phase particles at different sites of the specimen in DD5 single crystal superalloy during stress rupture tests is investigated using a scanning electron microscope and a transmission electron microscope. Effect of stress on the precipitation of the second phases and the crystal structure of the two precipitated phases are analysed. The results show that at 1 038℃/172 MPa, with the increase of the local tensile stress, the number of precipitated phases in both the interdendritic region and the dendrite arm increases obviously, whereas at 871℃/552 MPa, only a small number of granular precipitates are precipitated in the interdendritic region, and the number of precipitates increases with the increase of the tensile stress. The TEM analysis shows that the phase precipitated in the dendrite arm is mainly μ phase with a rhombohedral structure and that precipitated in the interdendritic region is mainly M23C6 phase.

Key words: single crystal superalloy, stress, stress rupture properties, μ phase, M23C6 carbide

CLC Number: