Misfit in Inconel-Type Superalloy

Strunz, Pavel; Petrenec, Martin; Davydov, Vadim; Polák, Jaroslav; Béran, P.

doi:10.1155/2013/408347

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…The lattice constants of c and c¢ phases slightly depend on the aging condition, while the misfit, which is similar for samples VDM-780-2 and 3, shows a slight decrease with increasing temperature, as it goes from 0.48 pct at RT to 0.45 and 0.44 pct at 950°C for samples VDM-780-2 and 3, respectively (note that sample VDM-780-1 shows no c¢ phase). This misfit decrease with temperature was observed previously in other superalloys with c/c¢ precipitate-strengthened microstructure [20,23] and related to the dissolution of some of the c¢-forming elements, such that the c phase can equilibrate to its most stable composition. [24] Finally, in order to correlate the microstructure of the measured samples after the different aging treatments with their mechanical properties, the HV of the three different samples was measured and the results are summarized in Table III.…”

Section: Resultssupporting

confidence: 83%

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In Situ Characterization at Elevated Temperatures of a New Ni-Based Superalloy VDM-780 Premium

Solís

Munke

Bergner

et al. 2018

Metall Mater Trans A

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A new Ni-base superalloy VDM-780 Premium was developed for higher service temperatures (above 650°C), keeping the good processing characteristics of alloy 718. This article presents, for the first time, the morphology and the microstructure characterization of this newly developed superalloy VDM-780 by means of scanning electron microscopy (SEM) and neutron and X-ray diffraction (XRD), after three different aging treatments performed for setting up different microstructures. Results show the presence of the c-matrix, c¢-hardening phase, and a high-temperature phase whose structure is compatible with d and g phases but whose exact crystal structure or the possibility of two different high-temperature phases still remains open. Rietveld refinements have allowed phase identification, determination of the lattice constants, and the weight fractions of constituting phases and shown that the presence of the different phases, amount, and morphology highly depend on the aging treatments. No traces of the c¢¢ phase are observed regardless of the heat treatment. In situ neutron diffraction (ND) studies at high temperature have allowed the determination of the solvus temperatures of the different phases present in each material after the corresponding aging treatment as well as the study of the evolution of their lattice parameters with temperature. The Vickers hardness (HV) of the three different samples was measured, and the results are correlated with the amount and particle size of the c¢-hardening phase of each sample.

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Section: Resultssupporting

confidence: 83%

“…The lattice misfit, d, between the c-matrix and the c¢-hardening phase, which is defined as the relative difference between the lattice parameters of the c¢ precipitates and the c matrix, is also determined [20] :…”

Section: Methodsmentioning

confidence: 99%

In Situ Characterization at Elevated Temperatures of a New Ni-Based Superalloy VDM-780 Premium

Solís

Munke

Bergner

et al. 2018

Metall Mater Trans A

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show abstract

“…with a γ and a γ as the lattice parameters of the γ and γ-phases respectively. The lattice misfit (δ) between the γ and γ -phases at 980 • C for this alloy is +0.025% and is obtained from [57]. In addition to these misfit stresses, due to inhomogeneous deformation in the two phases, plastic strain gradients also develop.…”

Section: Discussionmentioning

confidence: 93%

Identification of texture characteristics for improved creep behavior of a L-PBF fabricated IN738 alloy through micromechanical simulations

Prasad

Biswas

Vajragupta

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Additive manufacturing (AM) typically promotes epitaxial growth of columnar grains with strong crystallographic texture (〈001〉 fibre or cube texture) in nickel-base superalloys, due to high temperature gradients during the building process. Understanding the mutual dependency between AM process parameters, the resulting microstructure and the effective mechanical properties of the material is of great importance to accelerate the development of the manufacturing process. In this work, a multi-scale micromechanical model is employed to gain deeper insight into the influence of various texture characteristics on the creep behavior of an IN738 superalloy. The creep response is characterized using a phenomenological crystal plasticity (CP) creep model that considers the characteristic γ-γ' microstructure and all active deformation mechanisms. The results reveal that the creep strength increases with decreasing texture intensities and reaches maximum when the 〈001〉 fibre and cube textures are misaligned to the specimen building direction by 45 degree. The simulations also predict that the uncommon 〈111〉 and 〈110〉 fibres offer significantly higher creep resistance than the typically observed 〈001〉 fibre, which provides a further incentive to investigate AM processing conditions that can produce these unique textures in the material. As the intensities and the alignment of 〈001〉 fibre and cube textures can be attributed to the laser energy density and the scan strategy employed, and as the formation of distinct fibre textures depends on the geometry of the resulting melt pool, the Laser powder bed fusion (L-PBF) process parameters can be optimized to obtain microstructures with features that improve the creep properties.

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In Situ Characterization at High Temperature of VDM Alloy 780 Premium to Determine Solvus Temperatures and Phase Transformations Using Neutron Diffraction and Small-Angle Neutron Scattering

Solís¹,

Munke²,

Hofmann³

et al. 2019

The Minerals, Metals &Amp; Materials Series

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Misfit in Inconel-Type Superalloy

Cited by 9 publications

References 9 publications

In Situ Characterization at Elevated Temperatures of a New Ni-Based Superalloy VDM-780 Premium

In Situ Characterization at Elevated Temperatures of a New Ni-Based Superalloy VDM-780 Premium

Identification of texture characteristics for improved creep behavior of a L-PBF fabricated IN738 alloy through micromechanical simulations

In Situ Characterization at High Temperature of VDM Alloy 780 Premium to Determine Solvus Temperatures and Phase Transformations Using Neutron Diffraction and Small-Angle Neutron Scattering

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