δ-phase precipitation regularity of cold-rolled fine-grained GH4169 alloy plate and its effect on mechanical properties

Xue, Hao; Zhao, Jingqi; Liu, Yongkang; Zhang, Chunxiang; Luo, Junting

doi:10.1016/s1003-6326(20)65461-9

Cited by 19 publications

(2 citation statements)

References 27 publications

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“…Compared to the deformed samples, the δ phase content of samples after the first annealing stage obviously increased. This is because lots of dislocations remained after deformation, thereby promoting the precipitation of the δ phase during AT [ 48 ]. From Figure 7 g–i, it can be seen that the weight fraction of the δ phase first decreased and then increased.…”

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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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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“…The optimal rolling and heat treatment process parameters were determined and the process was simplified. Xue Hao [6] used cold rolling and heat treatment processes to refine the grains of GH4169 alloy plate, studying the effects of cold rolling reduction rate and heat treatment time on the precipitation of the δ phase. Chen Ming-Song [7] adopted a new two-stage heat treatment method, including aging treatment and cooling recrystallization heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing temperature on microstructure and properties of the microtubes for GH4169 alloy

Kehang,

Yang,

Guo

et al. 2024

Mater. Res. Express

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The effects of annealing temperature on the recrystallization and grain boundary distribution characteristic for the drawn microtube of GH4169 alloy were studied by scanning electron microscope (SEM) equipped with an electron backscatter diffraction (EBSD) analysis system and transmission electron microscopy (TEM). The results demonstrated that at an annealing temperature of 850 ℃, only a small proportion of recrystallization for the microtube underwent. As the annealing temperature increased, the proportion of recrystallization also increased. Specifically, at 900 ℃, the proportion reached 95.8 %, indicating complete recrystallization. Fine recrystallization grains were obtained with an average grain size of 4.73 μm. As the annealing temperature is above 900 ℃, the microtube also undergo complete recrystallization, and the grains grow up gradually. At 1000 ℃, the average grain size grows to 7.42μm. The results also revealed that with the annealing temperature increasing, the proportion of Σ3 grain boundary of the microtube was rising. The proportion of Σ3 grain boundary increased from 30.1 % to 34.2 % with the annealing temperature increased from 900 ℃ to 1000 ℃. Moreover, as the annealing temperature increased from 850 ℃ to 1000 ℃, the room temperature tensile strength of the tube decreased from 1323 MPa to 965 MPa, the yield strength decreased from 1054 MPa to 523 MPa, and the fracture elongation increased from 10.2 % to 31.2 %. 

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Microstructure Evolution in GH4169 Alloy during Cross-Wedge Rolling

Gan,

Cheng,

Liu

et al. 2024

J. of Materi Eng and Perform

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δ-phase precipitation regularity of cold-rolled fine-grained GH4169 alloy plate and its effect on mechanical properties

Cited by 19 publications

References 27 publications

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

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

Effect of annealing temperature on microstructure and properties of the microtubes for GH4169 alloy

Microstructure Evolution in GH4169 Alloy during Cross-Wedge Rolling

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