Evolution of Annealing Twins in a Hot Deformed Nickel-Based Superalloy.
Evolution of Annealing Twins in a Hot Deformed Nickel-Based Superalloy.
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热变形镍基高温合金中退火孪晶的演化
DOI：
10.3390/ma15010007
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发表时间：
2021-12-21
期刊：
影响因子：
--
通讯作者：
Lu XZ
中科院分区：
文献类型：
--
作者：
Xia YC;Chen XM;Lin YC;Lu XZ
利用Gleeble-3500热模拟机研究了GH4169高温合金在1193-1313 K和0.01-1 s-1应变速率范围内的热变形特性。利用光学显微镜（OM）、透射电子显微镜（TEM）和电子背散射衍射（EBSD）技术对热变形后的组织进行了分析。详细讨论了变形参数对流变曲线和退火孪晶特征的影响。结果表明，变形温度对流变曲线的形状有很大的影响。宽峰出现在低变形温度或高应变速率。此外，退火孪晶的演化对变形程度、温度和应变速率非常敏感。随着变形程度的增加，退火孪晶所占比例先减少后增加。这是因为在较小的应变下，初始退火孪晶特征消失，而在随后的热变形过程中，随着动态再结晶晶粒的长大，退火孪晶迅速生成。当变形温度较高或应变速率较低时，退火孪晶的比例较高。此外，退火孪晶的动态再结晶（DRX）行为的重要作用被阐明。退火孪晶与动态再结晶晶界的共格性表明，退火孪晶是热变形过程中动态再结晶形核的主要动力。
The hot deformation characteristics of a GH4169 superalloy are investigated at the temperature and strain rate ranges of 1193–1313 K and 0.01–1 s−1, respectively, through Gleeble-3500 simulator. The hot deformed microstructures are analyzed by optical microscopy (OM), transmission electron microscopy (TEM), and electron backscattered diffraction (EBSD) technology. The effects of deformation parameters on the features of flow curves and annealing twins are discussed in detail. It is found that the shapes of flow curves are greatly affected by the deformation temperature. Broad peaks appear at low deformation temperatures or high strain rates. In addition, the evolution of annealing twins is significantly sensitive to the deformation degree, temperature, and strain rate. The fraction of annealing twins first decreases and then rises with the added deformation degree. This is because the initial annealing twin characters disappear at the relatively small strains, while the annealing twins rapidly generate with the growth of dynamic recrystallized grains during the subsequent hot deformation. The fraction of annealing twins is relatively high when the deformation temperature is high or the strain rate is low. In addition, the important role of annealing twins on dynamic recrystallization (DRX) behaviors are elucidated. The obvious bulging at initial twin boundaries, and the coherency of annealing twin boundaries with dynamic recrystallized grain boundaries, indicates that annealing twins can motivate the DRX nucleation during the hot deformation.
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