Subdivision of Dynamic Recrystallization Mechanism in the Transition Zone and Microstructure Evolution of Incoloy825 Alloy

Liu, Shuang; Feng, Jing; Luo, Xi; Chen, Xi; Tu, Yiyou; Jiang, Jianqing

doi:10.1002/adem.202101348

Cited by 3 publications

(2 citation statements)

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“…The continuous accumulation of dislocations within the deformed grains leads to the dislocation density reaching the threshold for the formation of DRX, dislocations form CDRX grains through the route of “dislocation cell—subgrain—DRX nuclei”. [ 39 ] Compared with the KAM maps in Figure 8d,e, it can be observed that the high dislocation density inside the grains where CDRX occurs is due to the continuous creation of dislocations during the progressive rotation of the grains. Dislocations in the initial grains form dislocation cells surrounded by LAGBs through slip, annihilate, and rearrange, as marked region in the TEM image of Figure 9c.…”

Section: Resultsmentioning

confidence: 95%

“…According to AZtecCrystal software, the GOS under different degrees of deformation was statistically analyzed, as shown in Figure 5a. Due to the lower GOS value of DRX grains than deformed grains, based on the experience of previous research [38][39][40][41] and the statistics of the collected data, a threshold value of 1.2°was used to separate recrystallized grains and deformed grains in this study.…”

Section: Grain Orientation Spread (Gos)mentioning

confidence: 99%

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Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

Jia,

Zhang,

Wang

et al. 2023

Adv Eng Mater

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Incoloy 800H alloy has excellent high‐temperature mechanical properties and broad application prospects. However, the dynamic recrystallization (DRX) behavior of this alloy at different deformations has been little studied. The thermal deformation characteristics and DRX mechanisms of Incoloy 800H alloy are studied by thermal compression tests. Quantitative analysis of grain size, DRX fraction, misorientation distribution, and twin boundaries under different deformation degrees is conducted using electron‐backscattered diffraction. Furthermore, the evolution characteristics of dislocations and grains are observed through transmission electron microscopy. It is found that the proportion of DRX improves with increasing deformation significantly. In the DRX process, discontinuous DRX (DDRX) is the main nucleation mechanism, while continuous DRX (CDRX) serves as an auxiliary nucleation mechanism. As the deformation increases, the CDRX + DDRX mechanisms can also be observed simultaneously in the high‐density dislocation region near the grain boundary. In addition, the ratio of ∑3 boundaries first decreases and then increases as the deformation increases. The initial twins gradually disappear due to the increase in deformation, and new twins are formed within the DRX grains. Twins can promote grain boundary bulging, provide more nucleation sites for DRX, and have a significant promoting effect on DRX.

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Section: Resultsmentioning

confidence: 95%