Abstract
The GH4141 superalloy with 20, 40 and 55% cold deformations is annealed at 1080, 1120 and 1180 °C for 3-25 min to study the recrystallization and twinning behavior. The migration rate of grain boundaries increases significantly as the temperature increases in the range of 1080-1180 °C. After recrystallization, the hardness of the alloy is obviously reduced, and the recrystallized grains are randomly oriented without preferred orientation. The orientation imaging microscopy maps indicate that large amounts of Σ3 twin boundaries caused by the stacking faults appear in recrystallized grains. On one hand, the fraction of Σ3 boundaries after short time annealing has increased with the increase of temperature, meaning that the higher temperature contributes to the faster migration rate of grain boundaries and thus promotes the formation of stacking faults and twin boundaries before full recrystallization. On the other hand, the density of Σ3 boundaries has gradually decreased with the increase of grain size due to the annihilation and rare formation of twin boundaries after full recrystallization. The twinning evolution can be explained using the classical growth accident model.
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