Solidification path in third-generation Ni-based superalloys, with an emphasis on last stage solidification

D’Souza, N.; Dong, Haibo

doi:10.1016/j.scriptamat.2006.08.060

Cited by 73 publications

(63 citation statements)

References 10 publications

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“…[1a], [2] and [3] (i) At the solutioning temperature, p O2 > 4. The eqlb p Ni for volatilisation of NiO calculated for a range of p O2 where NiO is stable is within an order of magnitude of the eqlb p Ni for vaporization of Ni from the surface of the sample, 8.7 9 10 À8 atm < p Ni < 5.5 9 10 À7 atm in the temperature range; 1523 K (1250°C) < T < 1633 K (1360°C) (Eq.…”

Section: ½3mentioning

confidence: 99%

“…The eqlb p Ni for volatilisation of NiO calculated for a range of p O2 where NiO is stable is within an order of magnitude of the eqlb p Ni for vaporization of Ni from the surface of the sample, 8.7 9 10 À8 atm < p Ni < 5.5 9 10 À7 atm in the temperature range; 1523 K (1250°C) < T < 1633 K (1360°C) (Eq. [3]). It follows therefore that for the typical O 2 partial pressures in the furnace chamber; either NiO will dissociate, or vaporization of NiO is most likely to occur and this phenomenon is more pronounced with increasing temperature.…”

Section: ½3mentioning

confidence: 99%

“…[2][3][4][5][6] Therefore, a homogenization treatment is required to dissolve the eutectic and to eliminate the cored microstructure. During solutioning, the alloy is heated to the c phase field above the solvus temperature.…”

Section: Introductionmentioning

confidence: 99%

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On the Roles of Oxidation and Vaporization in Surface Micro-structural Instability during Solution Heat Treatment of Ni-base Superalloys

D’Souza

Welton

West

et al. 2014

Metall Mater Trans A

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Micro-structural instability at the surface that develops during solution heat treatment of a typical third generation Ni-base superalloy, CMSX10N has been reported. It is shown that elemental Ni vaporizes from the surface during solutioning leading to de-stabilization of c phase. With increasing extent of vaporization, a phase mixture of b, c¢, and the refractory (W and Re-rich) precipitates occur within the surface layers resulting in the complete breakdown of the cuboidal c/c¢ phase morphology that is usually observed. It is demonstrated that the conditions at the surface have a marked effect on the vaporization kinetics and subsequent evolution of surface phases-the presence of a continuous dense oxide such as Al 2 O 3 or the presence of sacrificial Ni-foils interspersed in the furnace significantly suppresses elemental vaporization from the sample surface.

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Section: ½3mentioning

confidence: 99%

Section: ½3mentioning

confidence: 99%

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On the Roles of Oxidation and Vaporization in Surface Micro-structural Instability during Solution Heat Treatment of Ni-base Superalloys

D’Souza

Welton

West

et al. 2014

Metall Mater Trans A

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“…This rosette-shaped γ/γ′ eutectic can be morphologically characterized by two distinct regions; fine lamellar γ/γ′ structure and coarse eutectic γ′ embedded in thin γ channels, as denoted in Figure 3(b). Recently, D'Souza and Dong [31] have suggested that these regions formed by independent two reactions, i.e. coarse γ′ particles nucleate from γ at the γ/L interface and coarsen via a peritectic reaction of L + γ → γ′ after the formation of primary γ dendrite.…”

Section: Effect Of Back-diffusion During Dendritic Solidificationmentioning

confidence: 99%

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Seo

Lee

Yoo

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The solute redistribution behavior during directional solidification of the alloy CMSX-10 with planar and dendritic solid/liquid (S/L) interfaces has been investigated by directional solidification and quenching (DSQ) technique. In particular, the elemental partitioning coefficient during the solidification of primary γ and γ/γ′ eutectic was quantitatively estimated by electron probe microanalysis (EPMA) on the sample quenched during planar growth of primary γ and γ/γ′ eutectic, respectively. The EPMA compositional profiles clearly revealed that Scheil solidification occurs during the solidification of primary γ with planar S/L interface. Based on this result, the evolution of γ/γ′ eutectic volume fraction with respect to the solidification rate in dendritic solidification regimes could be rationalized by considering the back-diffusion effect on decreasing the extent of microsegregation. The comparison of the compositional profiles of Cr in the planar grown DSQ sample and the local distribution of Cr in dendritically solidified sample indicated that the solidification of the alloy CMSX-10 completes with the formation of supersaturated γ phase after the γ/γ′ eutectic reaction.

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“…In particular, differential scanning calorimetry (DSC) can be used to estimate the transformation temperatures in complex multicomponent systems. The challenges with the use of DSC in extracting these points have been previously studied in depth, especially in relation to determination of the solidus temperature [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization and Thermal Analysis of Aluminum Alloy B206 During Solidification

Haghdadi

Phillion

Maijer

2015

Metall Mater Trans A

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The solidification kinetics of a high strength B206 aluminum casting alloy as a function of cooling rates between 1 and 15 K/min has been characterized through a combination of differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and optical microscopy. Three different peaks were detected in the DSC analysis, which corresponded to the nucleation of an α-Al solid solution, an Al-Cu-Fe intermetallic and the eutectic phases. The presence of these phases was confirmed using a coupled scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analysis. The α-Al nucleation temperature was found to be independent of cooling rate while the eutectic and the intermetallic formation temperatures were depressed by up to 20 K. The evolution of the fraction solid, particularly during the solidification of α-Al was also affected by the cooling rate in such a way that slower cooling was accompanied by a higher fraction solid at a given temperature. Concurrently, microscopy was used in order to quantify the variation in secondary dendrite arm spacing (SDAS) with cooling rate for use in numerical simulations of casting processes.

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Solidification path in third-generation Ni-based superalloys, with an emphasis on last stage solidification

Cited by 73 publications

References 10 publications

On the Roles of Oxidation and Vaporization in Surface Micro-structural Instability during Solution Heat Treatment of Ni-base Superalloys

On the Roles of Oxidation and Vaporization in Surface Micro-structural Instability during Solution Heat Treatment of Ni-base Superalloys

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Microstructure Characterization and Thermal Analysis of Aluminum Alloy B206 During Solidification

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