Distribution of Alloying Element Atoms between γ- and γ'-Phase Particles in a Heat-Resistant Nickel Alloy

Ber, L. B.; Рогожкин, С. В.; Хомич, А. А.; Залужный, А. Г.

doi:10.1134/s0031918x22020028

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Morphological bending is related to the changes in the local chemistry of the liquid phase influencing the growth direction of a dendrite without changing the crystal orientation of the dendrites. It is related to the so-called dendritic segregation of alloying elements [25][26][27][28][29]. If, in addition, there is a change in the crystal orientation of the growing dendrite, it is a mechanical bending related to the local distortion of the crystal lattice with a change in the lattice parameter, and hence the formation of residual stresses [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…The single-crystalline superalloys contain several alloying additives that segregate into interdendritic regions or dendrites, the arms of which may cover an area of even several hundred microns. The chemical composition heterogeneity related to dendritic segregation is disadvantageous [1,[25][26][27][28][29]. Disturbances in the dendrite growth cause both local changes in the crystal orientation of dendrites and changes in their chemical composition, as well as changes in a crystal lattice parameter [36].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (I)

2022

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The γ′ lattice parameter aγ′ and the α angle defining the primary crystal orientation of the single-crystalline cored turbine blades made of CMSX-4 superalloy were measured in the areas located near the selector situated asymmetrically, considering the top view of the blade. The distributions of the aγ′ and the α angle were determined along the lines parallel to the vertical blade axis Z using X-ray diffraction methods. The relations between changes in the aγ′(Z) and α(Z) were analyzed on the Z levels where the shape of the blade’s cross-section changes. For the first time, the local increase in aγ′(Z) was found near the root–airfoil connection level and near certain other root levels, which is related to the change in blade section shapes on such levels. The local extremes in α(Z), representing the dendrite bend, were observed at these levels. The increase in the aγ′(Z) with the local bending of dendrites was discussed concerning the local redistribution of alloying elements and local residual stresses of the γ-dendrites. For the first time, a method of analyzing the local bending of the dendrites was proposed by studying the behavior of the α(Z). The presented results concern the first stage of the research covering areas relatively close to the selector, considering the top view of the blades. The second stage will include the analysis of the areas of the blade localized at a longer distance from the selector.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (I)

2022

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“…Morphological bending is related to the local changes in the chemical composition of the liquid, influencing the growth direction of the dendrites without changing their crystal orientation. Some reasons for the changes in chemical composition are similar to those in the case of the so-called dendritic segregation of alloying elements that superalloys contain a lot of [16][17][18][19][20]. Moreover, if there is a change in the crystal orientation of the growing dendrite, it means there is a mechanical bending related to the local distortion of its crystal lattice.…”

Section: Introductionmentioning

confidence: 84%

Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (II)

2023

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The distributions of the lattice parameter of the γ′-phase (aγ′) and angular components of the primary crystal orientation along the lines parallel to the main axis of the single-crystalline CMSX 4-cored turbine blades were studied. The studies were carried out on the regions of the blades located far from the selector and its continuer extension (CE), positioned asymmetrically relative to the blade’s axis. It was found that, similarly to the regions of the blade located close to the CE (studied in part I), at the level of the blade related to the change of its cross-section, there were correlated local changes in aγ′ and the angular components of the primary crystal orientation representing the bending of the dendrites. However, the correlation was less clear due to the presence of low-angle boundaries (LABs) and the intensification of the consequences of the “fanning effect” in the regions far from the CE. It was found that the range of local changes in aγ′ and the angular components of the primary crystal orientation of the blade regions were influenced by both the distance from the CE and the separation of these regions from the CE by surfaces of the cooling bores. It was found that the deviation angle in the [001] direction from the blade axis increased with an increase in the distance from the CE. Based on the aγ′ changes, differences in the alloying element concentration near the cooling bores were discussed.

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Characterization of Nanosized Clusters and Transition Layers of Contacting γ- and γ'-Phases in a Ni-Based Superalloy

Рогожкин

Ber

Хомич

2023

Phys. Metals Metallogr.

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Distribution of Alloying Element Atoms between γ- and γ'-Phase Particles in a Heat-Resistant Nickel Alloy

Cited by 4 publications

References 10 publications

Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (I)

Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (I)

Effect of Blade Geometry on γ′ Lattice Parameter and Primary Orientation of SX Cored Turbine Blades (II)

Characterization of Nanosized Clusters and Transition Layers of Contacting γ- and γ'-Phases in a Ni-Based Superalloy

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