On the dendrite deformation and evolution mechanism of Ni-based superalloy during directional solidification

Chen, Chao; Sun, Jinhua; Diao, Aimin; Yang, Yanhong; Li, Jinguo; Zhou, Yizhou

doi:10.1016/j.jallcom.2021.161949

Cited by 15 publications

(4 citation statements)

References 33 publications

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“…The complex shape of the blades with cooling bores may create local disturbances in the dendrites' growth [38][39][40][41]. To observe the effect of such disturbances, it is necessary to study longitudinal cross-sections of the blades parallel to the axis of the blade.…”

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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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%

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

2022

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“…10(b)). However, this g' phase had irregular shapes unlike the cuboidal shape observed after heat treatment (solutionizing and aging treatments) of the alloy 18 . After solutionizing treatment, the alloy revealed a significantly homogenized structure with volume percentage of the eutectic phase reducing to about 2.5%.…”

Section: Ceramic Shell Making and Casting Related Aspectsmentioning

confidence: 87%

Realization of High Pressure Turbine Blades of a Small Turbo Fan Engine through Investment Casting Process

Chatterjee,

Chauhan,

et al. 2023

Def. Sc. J.

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Turbo-fan gas turbine engines, or simply turbo-fan engines (STFEs), are used for powering both manned aircrafts and unmanned air vehicles (UAVs). The high pressure turbine section of such engines use Ni-base superalloy cast rotor blades because of their good mechanical properties at high operating temperatures. The present paper provides the technical/technological details of the various aspects associated with development and manufacturing of high pressure turbine blades (HPTBs) for utilization in an indigenously-developed small turbo-fan engine. Vacuum investment casting process has been adopted for realization of the above equiaxed components using a Ni-base superalloy

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“…Even within the mushy zone, the mechanical behaviour of dendrites may be further constrained by the convergence of the secondary arms, which allows load to pass between dendrites [7]. This can potentially lead to regions of high stress where a dendrite deform like a cantilever causing secondary arms to impact [10], while in other cases these impinging secondary arms lead to successive dendrites forming a strip which acts together in a cantilever beam like manner [11].…”

Section: Introductionmentioning

confidence: 99%

A study of the complex dynamics of dendrite solidification coupled to structural mechanics.

Soar

Kao

Djambazov

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The impact of structural mechanics is often overlooked when modelling the solidification of dendritic microstructures, despite experimental observations that the interaction between these processes can be a factor leading to the development of crystal mosaicity throughout the microstructure which can itself lead to more serious defects. When considered at all, the structural mechanical behaviour of columnar dendrites is often considered as being analogous to a cantilever beam both in interpretations of experimental results and in existing numerical modelling. While this is not an unreasonable assumption when considering a dendrite in isolation, this is a scenario that infrequently occurs. In this paper a parametric study is presented using a Cellular Automata solidification solver coupled to a Finite Volume Structural Mechanics solver. These results highlight the complex non-linear behaviour that arises when considering dendrite interaction, demonstrating the significantly different microstructures that can be obtained by varying only the force experienced by the system.

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On the dendrite deformation and evolution mechanism of Ni-based superalloy during directional solidification

Cited by 15 publications

References 33 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)

Realization of High Pressure Turbine Blades of a Small Turbo Fan Engine through Investment Casting Process

A study of the complex dynamics of dendrite solidification coupled to structural mechanics.

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