Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

Chen, Fei; Cui, Zhenshan; Ou, Hengan; Long, Hui

doi:10.1007/s00339-016-0404-1

Cited by 44 publications

(7 citation statements)

References 35 publications

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“…The preferred properties of Ni-Fe-Cr-base superalloys are highly related to the hot forming processes [3,4]. During hot forming, the DRX behaviors of Ni-Fe-Cr-base superalloys are highly intricate owing to the multiple alloying compositions [5,6,7,8]. Meanwhile, the complex microstructure, large deformation resistance, and narrow forming temperature range make hot forming processes very complicate [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Wen

Lin

Zhou

2017

Vacuum

120

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Section: Introductionmentioning

confidence: 99%

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Wen

Lin

Zhou

2017

Vacuum

120

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“…Hence, the pinning effect of the δ phase on the growth of grains is weakened. In addition, high temperatures can also significantly induce recrystallization nucleation [ 39 , 40 ]. In general, the large kernel average misorientation (KAM) value means a high dislocation density [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Deformation Parameters of an Initial Aged GH4169 Superalloy on Its Microstructural Evolution during a New Two-Stage Annealing

Chen

Lou³

et al. 2022

Materials

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This study aims to explore the effect of deformation parameters on microstructure evolution during the new two-stage annealing method composed of an aging treatment (AT) and a cooling recrystallization annealing treatment (CRT). Firstly, the hot compressive tests with diverse deformation parameters were finished for an initial aged deformed GH4169 superalloy. Then, the same two-stage annealing method was designed and carried out for the deformed samples. The results show that the deformation parameters mainly affect the grain microstructure during CRT by influencing the content, distribution and morphology of the δ phase after deformation. The reason for this is that there is an equilibrium of the content of the δ phase and Nb atom. When the deformation temperature is high, the complete dissolution behavior of the δ phase nuclei promotes the dispersion distribution of the δ phase with rodlike and needle-like shapes during AT. Thus, the fine and heterogeneous microstructure is obtained after annealing because the recrystallization nucleation is enhanced in those dispersed δ phases during CRT. However, when the retained content of δ phase nuclei is high after deformation, the clusters of intragranular δ phases will form during AT, resulting in the pinning of the motion for dislocation. The elimination of the mixed grain microstructure is slowed down due to the low static recrystallization (SRX) nucleation rate within the deformed grain.

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“…Because there is a lack of sufficient driving force to eliminate dislocation completely during the inter-pass time. The flow stress reflects the macroscopic resistance of dislocation motion for further plastic deformation, strongly depends on the geometrically necessary dislocations (GNDs) [23,24]. Additionly, an intimate relationship between hardening and cell structure formation, which appears as an almost inevitable corollary to dislocation dominated strain hardening [25,26].…”

Section: Flow Stress-strain Curvesmentioning

confidence: 99%

Study on static softening behavior and hot working performance of Fe-0.2C-7Mn steel

Wang

Cen

Zhang

2022

Mater. Res. Express

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Static softening behavior and hot working performance of medium Mn steel (Fe-0.2C-7Mn) are studied by 2-step and interrupt hot compression test with a Gleeble-3500 thermal-mechanical simulator. The results show that static softening behavior of the steel exhibits obvious sensitivity to the deformation temperature, inter-pass time and strain rate. But deformation temperature has a more significant effect on the static recrystallization (SRX) grain size than strain rate. 3D hot working processing maps are established, that low temperature and medium strain rate (850°C~925°C and 0.02s-1~0.3s-1) are the preferred thermal deformation conditions for the test steel. Microstructure observations indicates that both static recovery (SRV) and SRX occur within inter-pass time, and SRV is the predominant mechanism in determining softening fraction. The microstructure is composed of film-like α at room temperature, and most of the nucleation of SRX preferably take place at triple junctions of grains or prior grain boundaries. Besides, high-angle grain boundaries (HAGBs) migration produce twin boundaries during grain growth and the main nucleation mechanism of the SRX is strain-induced boundary migration. The kinetics model of static softening is established and the experimental values are consistent with predicted ones, which proves the reliability of the model.

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Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

Cited by 44 publications

References 35 publications

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Effect of Deformation Parameters of an Initial Aged GH4169 Superalloy on Its Microstructural Evolution during a New Two-Stage Annealing

Study on static softening behavior and hot working performance of Fe-0.2C-7Mn steel

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