Microstructural evolution and grain refinement mechanisms of a Ni-based superalloy during a two-stage annealing treatment

Chen, Mingsong; Zou, Zhi; Lin, Y.C.; Li, Hongbin; Wang, Guan-Qiang; Ma, Yan-Yong

doi:10.1016/j.matchar.2019.03.037

Cited by 50 publications

(25 citation statements)

References 59 publications

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“…In addition, to investigate the difference of tensile behavior at high temperature and room temperature, cases 3 and 9 in addition to 4 and 10 were annealed in the same condition of annealing but deformed under different tensile tests. The selection of annealed parameters is based on the authors’ previous study [ 30 , 32 ]. After that, the high temperature and room temperature uniaxial tensile tests were conducted on a MTS-GWT2105 machine, and the detailed uniaxial tensile experimental schemes are shown in Table 2 .…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…This is because the high driving pressure and the weak pinning effect of the δ phase promote the quick growth of dynamic recrystallized (DRX) grain nuclei [ 31 ]. In order to avoid the appearance of coarse recrystallized grains, Chen et al [ 32 ] designed the double-stage annealing treatment and found that the double-stage annealing treatment has a better effect on refining grain and improving the homogeneity of microstructure compared with the single annealing treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Uniform and fine grains are beneficial to the mechanical properties of forgings [ 35 , 36 ]. In the authors’ previous work [ 32 ], it was found that the double-stage annealing treatment is an effective way to eliminate the mixed grains of deformed GH4169 superalloy, but there are few studies on the improvement of mechanical properties during the double-stage annealing treatment up to now. Moreover, to simplify the experimental process, the small-size sample (ϕ10 mm × 15 mm) deformed on a Gleeble-3500 is selected as the study object in the author’s previous study [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the authors’ previous work [ 32 ], it was found that the double-stage annealing treatment is an effective way to eliminate the mixed grains of deformed GH4169 superalloy, but there are few studies on the improvement of mechanical properties during the double-stage annealing treatment up to now. Moreover, to simplify the experimental process, the small-size sample (ϕ10 mm × 15 mm) deformed on a Gleeble-3500 is selected as the study object in the author’s previous study [ 32 ]. Due to the volume effect of metal components, the obtained optimized annealing parameters can only provide a reference on the design of double-stage annealing treatments for large forgings.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

et al. 2021

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This study takes large size samples after hot-upsetting as research objects and aims to investigate the optimization double-stage annealing parameters for improving the mechanical properties of hot-upsetting samples. The double-stage annealing treatments and uniaxial tensile tests for hot-upsetting GH4169 superalloy were finished firstly. Then, the fracture mode was also studied. The results show that the strength of hot-upsetting GH4169 superalloy can be improved by the double-stage annealing treatment, but the effect of annealing parameters on the elongation of GH4169 alloy at high temperature and room temperature is not significant. The fracture mode of annealed samples at high-temperature and room-temperature tensile tests is a mixture of shear fracture and quasi-cleavage fracture while that of hot-upsetting sample is a shear fracture. The macroscopic expressions for the two fracture modes belong to ductile fracture. Moreover, it is also found that the improvement of strength by the double-stage annealing treatment is greater than the single-stage annealing treatment. This is because the homogeneity of grains plays an important role in the improvement of strength for GH4169 superalloy when the average grain size is similar. Based on a comprehensive consideration, the optimal annealing route is determined as 900 °C × 9–12 h(water cooling) + 980 °C × 60 min(water cooling).

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Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

et al. 2021

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“…1c). A higher temperature solution treatment was imparted to specimens to study the effect of solution treatment temperature on [9,10]. XH 67 is intended to be used as the base material for parts subjected to high temperatures and are given metal-ceramics coating which need high temperature firing.…”

Section: Optical Microstructure Observationsmentioning

confidence: 99%

Microstructural Characterization of XH 67 Nickel-Based Superalloy Under Different Heat Treatment Conditions

Jalaja

Chakravadhanula

Manwatkar

et al. 2021

Metallogr. Microstruct. Anal.

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XH 67 is a nickel-based superalloy, which is used in critical parts of modern aerospace engines. In the present study, XH 67 specimens in five different heat treatment conditions selected based on the processing and application have been investigated for their microstructures, morphology, and composition of the matrix and second-phase particles. Optical microscopic (OM) analysis revealed the presence of bi-model neck-lace type grains and equiaxed grains as a result of different heat treatment conditions. Scanning electron microscopy (SEM) and elemental composition analysis revealed precipitates and second-phase particles. Carbides such as Ti (N, C) and (W, Mo, Ti) C were observed having different sizes and shapes. Cr-rich carbide phases were found to be preferentially segregated along the grain boundaries. X-ray diffraction analysis was carried out for assessing the phases present in the alloy. X-ray diffraction analysis revealed the gamma matrix and the precipitate phase are crystallographically identical (coherent). Transmission electron microscopic (TEM) analysis of the specimens confirmed the presence of uniformly distributed spherical Ni 3 (Al, Ti) precipitates which impart thermal stability to the superalloy. Presence of different types of carbides is also revealed by TEM analysis.

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Annealing Treatment Methods and Mechanisms for Refining Mixed and Coarse Grains in a Solution Treatment Nickel‐Based Superalloy

Chen

Wang

et al. 2019

Adv Eng Mater

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The annealing treatment methods and mechanisms for refining deformed mixed and coarse grains in a solution treatment nickel‐based superalloy are investigated. The single‐stage annealing tests are done first, and it is found that the mixed and coarse grains are hardly refined to about 10 μm by a direct annealing at 980 °C due to lack of δ phase. Then, two‐stage annealing tests, in which the deformed sample is first heated to 900 °C for 12 h for precipitating some δ phases and then reheated to 980 °C for a recrystallization annealing treatment (RT), are designed. It is found that the recrystallization is still not complete although a long‐time RT is done. The main reason is that the distances between adjacent δ phases precipitating during direct aging are so small that the recrystallization nuclei are hard to form. So, three‐stage annealing tests, including a pre‐recrystallization annealing treatment (PRT) at 980 °C, an aging annealing treatment (AT) at 900 °C, and an RT at 980 °C, are designed. It is found that the PRT has a favorable influence on the refinement of mixed and coarse grains during the subsequent AT and RT. The mixed and coarse grains can be refined after the three‐stage annealing treatment of 980 °C × 3 min/WQ + 900 °C × 12 h/WQ + 980 °C × 120 min/WQ.

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Microstructural evolution and grain refinement mechanisms of a Ni-based superalloy during a two-stage annealing treatment

Cited by 50 publications

References 59 publications

Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

Microstructural Characterization of XH 67 Nickel-Based Superalloy Under Different Heat Treatment Conditions

Annealing Treatment Methods and Mechanisms for Refining Mixed and Coarse Grains in a Solution Treatment Nickel‐Based Superalloy

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