Effects of heat treatment on the microstructure evolution and the high-temperature tensile properties of Haynes 282 superalloy

Shin, Kee Sam; Kim, Jin-Hyeok; Terner, Mathieu; Kong, Byeong-Ook; Hong, Hyun-Uk

doi:10.1016/j.msea.2019.02.054

Cited by 55 publications

(13 citation statements)

References 29 publications

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“…Such serrated grain boundaries have been previously reported in Haynes 282 after slow cooling (0.05°C s À1 ) from 1135°C. [12] Formation of serrated boundaries during slow cooling and a resulting beneficial effect on the creep behavior have been reported for several Ni-base superalloys. [13][14][15][16] The present results shows that grain boundary serrations can also form during low-temperature annealing.…”

mentioning

confidence: 93%

Precipitation Kinetics and Morphology of Grain Boundary Carbides in Ni-Base Superalloy Haynes 282

Joseph

Persson

Colliander

2020

Metall Mater Trans A

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Precipitation of grain boundary carbides in a mill-annealed Haynes 282 in the temperature range 650 °C to 1120 °C was investigated. The kinetics of M23C6 was significantly faster than that of M6C. With increasing aging temperature, the morphology changes from continuous film to an interconnected brick wall structure and finally to discrete particles. No morphological changes were observed with aging time. Serrated grain boundaries formed during aging around 750 °C. The solvus temperature for both M23C6 and M6C was approximately 1100 °C.

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mentioning

confidence: 93%

Precipitation Kinetics and Morphology of Grain Boundary Carbides in Ni-Base Superalloy Haynes 282

Joseph

Persson

Colliander

2020

Metall Mater Trans A

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“…Most previous research into the microstructure and processing of H282 has focused on microstructure-property relationships [10][11][12][13][14][15], microstructure stability and related effects [16,17] and heat treatments [18,19] of already forged material. Limited efforts have been made towards understanding the effects of prior thermomechanical processing steps, i.e., forging.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Eriksson

Colliander

2021

Metals

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Thermomechanical processes, such as forging, are important steps during manufacturing of superalloy components. The microstructural development during processing, which controls the final component properties, is complex and depends on e.g., applied strain, strain rate and temperature. In this study, we investigate the effect of process parameters on the dynamic and post-dynamic recrystallization during hot compression of Ni-base superalloy Haynes 282. Specifically, we address the effect of deformation below the grain boundary carbide solvus temperature. During deformation, discontinuous and continuous dynamic recrystallization was observed at the grain boundaries, and particle-stimulated nucleation occurred at primary carbides. Strain rate was determined to be the governing factor controlling the recrystallization fraction for strain rates up to 0.5 s−1 above which adiabatic heating became the dominating factor. Careful examination of the temperature development during deformation showed that the response of the closed-loop temperature control system to adiabatic heating can have important effects on the interpretation of the observed behavior. During a 90 s post-deformation hold, grain growth and an increasing fraction of twin boundaries significantly changed the deformation-induced microstructure and texture. The microstructure developed during post-dynamic recrystallization was mainly controlled by the temperature and only weakly coupled to the prior deformation step.

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“…Although there was a small fraction of secondary γ' particles caused by FA treatment, the mechanical properties were not significantly affected. Shin et al [27] compared the tensile properties of Haynes 282 after 1-step and 2-step aging treatments at 750 °C; they found that the tensile strength was similar, but the elongation of Haynes 282 after 1-step aging was lower than that after 2-step aging. The lower ductility was probably because of the different grain boundary precipitates, as explained in Section 3.3.…”

Section: Bimodal Distribution Of γ' Particlesmentioning

confidence: 99%

Microstructural Evolution of Large Cast Haynes 282 at Elevated Temperature

Yang

2021

Crystals

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Haynes 282 has attracted attention for casting applications in AUSC power plants due to its good creep properties. However, the market is primarily comprised of wrought Haynes 282, while the cast version is not commercially available. In this study, the microstructure of a large traditional sand cast Haynes 282 was studied from as-cast condition to long-term heat-treated condition by combining experimental data and thermodynamic calculations. The microstructure of a large cast Haynes 282 includes γ, γ’, two types of MX, M23C6 and µ phases. After standard post heat treatment, µ phases were dissolved and precipitated as M6C. The equilibrium state was achieved after 266 h aging at 788 °C, after which γ’ particles began coarsening. These kept to a spherical morphology; the smallest misfit was found with the γ matrix. Once post heat treatment was finished, MX exhibited little morphology and compositional change during the long-term isothermal aging. Grain boundary is covered by discrete M23C6 and M6C precipitates and this morphology keeps stable during isothermal aging. No presence of the needle µ phase have been found at grain boundaries after 10,000 h aging at 788 °C. All these microstructural features indicated that cast Haynes 282 could have a high thermal stability and good creep properties.

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Effects of heat treatment on the microstructure evolution and the high-temperature tensile properties of Haynes 282 superalloy

Cited by 55 publications

References 29 publications

Precipitation Kinetics and Morphology of Grain Boundary Carbides in Ni-Base Superalloy Haynes 282

Precipitation Kinetics and Morphology of Grain Boundary Carbides in Ni-Base Superalloy Haynes 282

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Microstructural Evolution of Large Cast Haynes 282 at Elevated Temperature

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