Determination of transition temperatures during freezing and melting of interdendritic phases in Ni based superalloys

D’Souza, N.; Dong, Haibo

doi:10.1179/026708309x12506933873189

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…The relationships of liquid fraction-temperature were calculated through DSC and SPSC and are compared Fig. 11 Comparison of liquid fraction as a function of temperature of 690 mg Al-11.68mass% Si alloy for DSC and new SPSC for 3.1 K min -1 cooling and heating rate, together with prediction curve [17][18][19][20]. It can be seen that all heating curves from DSC are lying on the right-hand side of the Scheil curve, while all the cooling curves of DSC are lying on the left-hand side of the Scheil curve since heating is endothermic process and cooling is exothermic process.…”

Section: Results For Al-1168mass%si Alloymentioning

confidence: 99%

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

Savas

Dong

2017

J Therm Anal Calorim

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There is an increased demand for data with higher precision for the enthalpy changes and the fraction of solid/liquid temperatures of materials. Therefore, continuous efforts are often devoted to design calorimeters that can accurately measure materials' thermophysical properties. In this study, a new single-pan scanning calorimeter was used to measure the transition temperature and enthalpy change of three aluminium binary alloys. Measured results also were compared with the calculated results using thermodynamic software. The measured high accuracy enthalpy data were used to determine transient temperature. It is concluded that the new instrument is a promising device that can achieve reliable and reproducible materials' thermophysical data.

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Section: Results For Al-1168mass%si Alloymentioning

confidence: 99%

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

Savas

Dong

2017

J Therm Anal Calorim

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“…differential thermal analysis and DSC). The usefulness of this method to characterise the critical temperatures of various superalloys has been demonstrated elsewhere; [26][27][28] nevertheless, little data have been published for IN939 alloy.…”

Section: Solution Annealed Conditionsmentioning

confidence: 96%

Study on incipient melting in cast Ni base IN939 superalloy during solution annealing and its effect on hot workability

Jahangiri

Boutorabi

Arabi

2012

Materials Science and Technology

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Incipient melting of IN939 superalloy was investigated during solution annealing. In addition, the effect of this phenomenon was studied on hot workability of the alloy. The incipient melting was detected to be within the temperature range 1150–1160°C, which has been reported to be the standard temperature range of solution annealing of this material. The local melted regions were enriched in Zr, Nb and B elements, which appeared in the form of three different phases. The results also showed that even small amounts of local melted regions impair hot workability of the alloy. The use of long time solution annealing at 1150°C or a two-step solution heat treatment has been recommended to delay the incipient melting of the alloy. These treatments enhance hot workability of the alloy.

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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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Determination of transition temperatures during freezing and melting of interdendritic phases in Ni based superalloys

Cited by 6 publications

References 14 publications

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

Study on incipient melting in cast Ni base IN939 superalloy during solution annealing and its effect on hot workability

Microstructure Characterization and Thermal Analysis of Aluminum Alloy B206 During Solidification

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