On the heat treatment of Rene-80 nickel-base superalloy

Safari, Javad; Nategh, S.

doi:10.1016/j.jmatprotec.2006.03.165

Cited by 93 publications

(58 citation statements)

References 5 publications

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“…The morphologies of γ' precipitates are nearly-spherical. These results are in good agreement with other studies about the impact of cooling rates on the γ' precipitation [11,16]. The area fraction of γ' precipitates, as determined from the micrographs, was 37.7%, 29.7% and 20.7% for furnace cooling, air cooling, and oil quenching, respectively.…”

Section: Microstructuresupporting

confidence: 91%

“…It is widely reported that the solution's cooling rate governs the attributes of γ' precipitates [8][9][10][11][12]. A study on the Udimet 500 Ni-base superalloy indicates that size, shape and the area fraction of γ' precipitates are largely influenced by the cooling rate following partial solution treatments, and the increased cooling rate reinforces alloy strength but decreases ductility [9].…”

Section: Introductionmentioning

confidence: 99%

“…A study on the Udimet 500 Ni-base superalloy indicates that size, shape and the area fraction of γ' precipitates are largely influenced by the cooling rate following partial solution treatments, and the increased cooling rate reinforces alloy strength but decreases ductility [9]. In other research, the morphology and size of γ' precipitates can be greatly changed by the cooling rate [11,12]. According to Caron, the area fraction of γ', the precipitate size, the composition and the coherency strains due to the lattice misfit are the four main aspects that To ensure homogeneity, we found an annular region to manufacture the specimens, and the selected area is marked by red-dashed lines in Figure 1a.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dependence of Creep Performance and Microstructure Evolution on Solution Cooling Rate in a Polycrystalline Superalloy

Liu

Huang

et al. 2017

Metals

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Abstract:It is well known that the solution cooling rate has a great effect on the creep life of superalloys. In this research, three typical cooling rates were applied to generate different distributions of γ' precipitates for creep tests. Ingots used to make specimens were manufactured by hot extrusion, and the master alloy had the composition of an FGH4096 power metallurgy superalloy. SEM and SESD were used to observe the microstructure's evolution. The experimental results show that the fastest cooling rate corresponds to the highest creep life as well as the smallest rupture strain, and vice versa. The microscopic observations disclose that with an increasing cooling rate, the size and area fraction of γ' precipitates decrease, and the rupture mechanism changes from transgranular to intergranular. Moreover, some γ' precipitates changed to cuboid after the creep test. The results will provide new technological processes to design more creep-resistant, nickel-base superalloys.

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Section: Microstructuresupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dependence of Creep Performance and Microstructure Evolution on Solution Cooling Rate in a Polycrystalline Superalloy

Liu

Huang

et al. 2017

Metals

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“…The formation mechanism of these particles can be correlated to the diffusion of alloying elements during aging. Previous studies [7] demonstrated that after rapid cooling from solution temperature, matrix supersaturation with solute elements such as Al and Ti is the main reason for precipitation of the secondary γ'. Fig.…”

Section: The Effect Of Different Heat Treatment Cycles On the Secondamentioning

confidence: 99%

“…The amount and the size of γ'/γ eutectic phase formed during solidification depends on the solidification rate and the alloy composition [7]. This phase has a negative effect on the creep behavior especially on the second and the third region consequently decreasing the alloy lifetime [8].…”

Section: Introductionmentioning

confidence: 99%

The effects of solution treatment on the microstructure of the cast Ni-based IN100 superalloy

Jafari¹,

Abbasi²,

Rahimi³

et al. 2015

Metall Mater Eng

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In this research, the effects of the partial, full and partial + full solution heat treatments followed by aging at 900° C for 10 h, on the microstructure of cast Ni-based IN100 superalloy were assessed. It has been found that, the alloy in the partial + full solution treated condition had the optimal combination of γ' morphology, volume fraction and size. In this condition, the alloy possesses a cubic primary γ'with an average size of 470±10nm and 45% volume fraction. Discrete M 23 C 6 and M 6 C carbides were formed at the grain boundaries and the morphology of the cubic MC carbide was changed to the spherical shape. In addition, the volume fraction of γ'/γ eutectic phase dropped to half of its value, compared to the as-cast alloy. During partial solution treatment followed by aging, discrete carbides were formed at the grain boundaries. This treatment without full solutioning was not an effective method to provide an optimal volume fraction and arrangement of γ' and MC carbides morphology. Full solutioning alone, changed the cubic morphology of the primary γ' and the blocky MC carbides to the spherical shape.

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Comparison of the Mechanical Behavior and Evaluation of Different Damage Mechanisms in an Equiaxed and a Single Crystal Superalloys Subjected to Creep LCF and TMF

Vacchieri

Costa

2012

Superalloys 2012

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Hot gas path components in a gas turbine engine for power generation have to withstand to critical conditions in terms of temperature and load distribution. The requirement of higher flexibility of gas turbine engines drives the OEM producer to increase their knowledge of materials behaviour when creep and fatigue coexist. This paper tries to summarise and compare the microstructural damage evolution in two superalloys applied in Ansaldo gas turbine engine components with a different solidification process, René 80 and PWA 1483 SX. The samples from an intensive campaign of mechanical characterisation were used to study damage features after creep, LCF and TMF tests. They have been analysed through standard metallography and advanced characterisation techniques, like EBSD and In-Beam detector in a FEG-SEM. In depth microstructural investigations enabled characterization of damage evolution as a function of testing conditions and highlighted the differences that exist between equiaxed and single crystal alloys. For both the alloys creep-fatigue interaction happens also in presence of compressive hold time LCF and TMF cycles.

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On the heat treatment of Rene-80 nickel-base superalloy

Cited by 93 publications

References 5 publications

Dependence of Creep Performance and Microstructure Evolution on Solution Cooling Rate in a Polycrystalline Superalloy

Dependence of Creep Performance and Microstructure Evolution on Solution Cooling Rate in a Polycrystalline Superalloy

The effects of solution treatment on the microstructure of the cast Ni-based IN100 superalloy

Comparison of the Mechanical Behavior and Evaluation of Different Damage Mechanisms in an Equiaxed and a Single Crystal Superalloys Subjected to Creep LCF and TMF

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