Homogenization heat treatment and segregation analysis of equiaxed CMSX-4 superalloy for gas turbine components

Condruz, Mihaela Raluca; Matache, Gheorghe; Paraschiv, Alexandru; Puşcaşu, Cristian

doi:10.1007/s10973-018-7085-2

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…However, it has been stated that not all macroscopic LABs are eliminated by the heat treatment but also that new extra LABs may be created as a result of this treatment. All of the LABs decrease the strength of the rotor blades [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

2020

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In the present study, the dendrites deflection mechanism from the mold walls were subjected to verification regarding its heat-treated turbine rotor blades. The number of macroscopic low-angle boundaries created on the cross-section of the blades’ airfoil near the tip was experimentally determined and compared to the number of low-angle boundaries calculated from a model based on the dendrites deflection mechanism. Based on the Laue patterns and geometrical parameters of airfoils, the number of low-angle boundaries occurring at the upper part of the blades airfoil after heat treatment was calculated. This number for the analyzed group of blades ranged from 5 to 9.

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Section: Introductionmentioning

confidence: 99%

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

2020

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“…Investigations were carried out on other alloys, using the same methodology as in this paper. A combination of CALPHAD (CALculation of PHAse Diagrams) and differential scanning calorimetry (DSC) has been successfully used to determine the optimum homogenization parameters and to understand the phase transformations during this process [23][24][25]. In particular, the impact of homogenization on changes in the morphology of Fe-constituents, which are known to have a significant effect on formability, was investigated.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Fe-based intermetallic phases during homogenization of Al–Fe hypoeutectic alloy

Arbeiter

Vončina

Volšak

et al. 2020

J Therm Anal Calorim

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Homogenization heat treatment is the first step in the processing of aluminium alloys, which for most alloys is carried out before any deformation process. Homogenization is performed to counteract microsegregation, which is the result of nonequilibrium solidification caused by diffusion rate differences between solid and liquid states during solidification. Special attention must also be paid to the impact of homogenization on changes in the morphology of iron-based constituents which are known to adversely affect formability. For the purpose of this work, a hypoeutectic Al-Fe alloy containing 1.1 mass/% Fe was homogenized at 600 °C for up to 12 h in an electric furnace. After the homogenization heat treatment, differential scanning calorimetry (DSC) was performed, comparing the homogenized samples with the sample in the as-cast state. The results were compared with thermodynamic calculations using Thermo-Calc software in order to determine the differences between the microstructure in the equilibrium and non-equilibrium state. All samples were analysed by optical and electron microscopy, and the intermetallic phases were qualitatively evaluated by both methods. In addition, energy-dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD) were required to determine the type of phases present in all experimental samples and a difference between the as-cast and homogenized state was found. The presence of metastable phases in the as-cast state and the transformation of such phases during the homogenization process was confirmed. A homogenization process, which lasted 12 h at 600 °C, was also performed with a DSC instrument. The experiment confirmed a greater heat transfer at the beginning of the homogenization process, which is consistent with all previous analyses. All results showed that after 10 h of homogenization the effects of non-equilibrium solidification in this alloy were sufficiently counteracted.

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“…Owing to remarkable mechanical properties and oxidation resistance at high temperature, Nibased superalloys are commonly used materials for hightemperature applications such as turbine blades and disks in aircraft engines and industrial steam turbines [2,3]. In general, conventional Co-based superalloys possess superior corrosion resistance; however, they exhibit lower mechanical properties in comparison with those of c 0 -strengthened Ni-based superalloys; hence, these alloys are used for mechanically lower loaded gas turbine vanes, where appropriate performance in corrosive environments is required [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal parameters determination of Co–Al–W as-cast alloy homogenization by DTA analysis

Tomaszewska

Moskal

Migas

et al. 2018

J Therm Anal Calorim

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The c-c 0 Co-based superalloys are newly developed class of refractory alloys which may replace commercial Ni-based superalloys owing to their favorable properties at high temperature. In case of new Co-based superalloys, the heat treatment aims to obtain microstructure composed of appropriate volume fraction of small cuboidal c 0 -Co 3 (Al,W) precipitates within the c-Co matrix. However, due to a high tendency to interdendritic segregations of alloying elements, the alloys based on Co-Al-W system should be normally homogenized before further steps of heat treatment (solutionizing and aging). In this study, thermal analysis was applied for determination of temperature range for primary heat treatment of the Co-9Al-9W (at.%). The differential thermal analysis (DTA) measurements were carried out on the thermal analyzer NETZSCH STA 449 F3 Jupiter. On the base of obtained results, respectively, solvus of c 0 phase and solidus temperatures were determined, as well as the thermal range of Co 3 W (DO 19 ) phase precipitation. As a consequence, the heat treatment without homogenizing (only solution and aging) was proposed as a most suitable way to obtain beneficial microstructure.

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Homogenization heat treatment and segregation analysis of equiaxed CMSX-4 superalloy for gas turbine components

Cited by 10 publications

References 24 publications

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

Evolution of Fe-based intermetallic phases during homogenization of Al–Fe hypoeutectic alloy

Thermal parameters determination of Co–Al–W as-cast alloy homogenization by DTA analysis

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