Microsegregation and secondary phase formation during directional solidification of the single-crystal Ni-based superalloy LEK94

Inmaculada Lopez-Galilea; Stephan Huth; Suzana G. Fries; Nils Warnken; Ingo Steinbach; Werner Theisen

doi:10.1007/s11661-012-1327-x

Microsegregation and secondary phase formation during directional solidification of the single-crystal Ni-based superalloy LEK94

Inmaculada Lopez-Galilea^*, Stephan Huth, Suzana G. Fries, Nils Warnken, Ingo Steinbach, Werner Theisen

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.

Original language	English
Pages (from-to)	5153-5164
Number of pages	12
Journal	Metallurgical and Materials Transactions A
Volume	43
Issue number	13
DOIs	https://doi.org/10.1007/s11661-012-1327-x
Publication status	Published - Dec 2012

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys
Mechanics of Materials

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abstract = "A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.",

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AU - Lopez-Galilea, Inmaculada

AU - Huth, Stephan

AU - Fries, Suzana G.

AU - Warnken, Nils

AU - Steinbach, Ingo

AU - Theisen, Werner

PY - 2012/12

Y1 - 2012/12

N2 - A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.

AB - A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.

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JO - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

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ER -

Microsegregation and secondary phase formation during directional solidification of the single-crystal Ni-based superalloy LEK94

Abstract

ASJC Scopus subject areas

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