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通过对DD10单晶高温合金1100℃长时时效组织以及在1100℃/140MPa下持久试样断裂后不同部位的组织进行观察分析,研究应力对该合金组织稳定性的影响。结果表明:DD10单晶高温合金经1100℃/253h长时时效和1100℃/140MPa持久断裂后析出的TCP相均为富集Re,W,Cr和Mo元素的μ相。1100℃/140MPa持久条件下,应力的引入促进μ相的析出,且μ相的析出量随着应力的增大而增大,但应力未改变TCP相的析出种类和形貌。此外,应力促进γ’相的筏排化过程。
The effect of stress on the microstructure stability of the alloy was investigated by observing and analyzing the microstructure of DD10 single crystal superalloy at 1100 ℃ for a long time and the ruptured sample at 1100 ℃ / 140MPa. The results show that all the TCP phases precipitated after long-term aging at 1100 ℃ / 253h and long-term rupture at 1100 ℃ / 140MPa are the μ phases enriched with Re, W, Cr and Mo. At 1100 ℃ / 140MPa for a long time, the introduction of stress promoted the precipitation of μ phase, and the precipitation of μ phase increased with the increase of stress, but the stress did not change the precipitation type and morphology of TCP phase. In addition, stress promotes the rafting process of the γ ’phase.