| Citation: | LI Shifeng, MA Husheng. Influencing factors and control methods of surface microstructure transformation of single crystal blade[J]. Journal of Aerospace Power, 2023, 38（1）：41-46 doi: 10.13224/j.cnki.jasp.20210438
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The problem of surface recrystallization was found on the structural distortion region of single crystal blade after the high temperature heat treating. To solve this problem, a method was proposed based on critical stress of recrystallization and residual stress of structure. With the help of structural optimization technology, the study showed that the critical stress happened justly under the recrystallization of the single crystal blade, and the residual stress level of structure was no more than the critical stress of recrystallization stress. Results showed that the temperature and stress concentration level were two major factors inducing structural recrystallization, and the recrystallization was originated from discontinuous cellular microstructure of the single crystal blade. Meanwhile, the critical stress of recrystallization was used to establish a relationship with the structure design parameters and the heat treatment temperature, then, the test validation work was completed for the real blade. This method is effective to restrain the structural recrystallization of single crystal blade and control the structural integrity and surface microstructure continuity.
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