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.
LV Peisen
,
GAO Qiang
,
LI Changjin
,
LIU Lirong
,
ZHANG Mingjun
,
PENG Zhijiang
. Effect of stress on precipitated phases in DD5 single crystal superalloy during stress rupture tests[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(6)
: 424073
-424073
.
DOI: 10.7527/S1000-6893.2020.24073
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