The effect of Nb on grain boundary segregation of B in high refractory Ni-based superalloys

Stoichko Antonov; Jiajie Huo; Qiang Feng; Dieter Isheim; David N Seidman; Randolph C. Helmink; Eugene Sun; Sammy Tin

doi:10.1016/j.scriptamat.2017.05.028

The effect of Nb on grain boundary segregation of B in high refractory Ni-based superalloys

Stoichko Antonov^*, Jiajie Huo, Qiang Feng, Dieter Isheim, David N Seidman, Randolph C. Helmink, Eugene Sun, Sammy Tin

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article

8 Scopus citations

Abstract

Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 °C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of σ phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase.

Original language	English (US)
Pages (from-to)	35-38
Number of pages	4
Journal	Scripta Materialia
Volume	138
DOIs	https://doi.org/10.1016/j.scriptamat.2017.05.028
State	Published - Sep 1 2017

Keywords

Atom probe tomography
Grain boundaries
Precipitation
Superalloy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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Antonov, S., Huo, J., Feng, Q., Isheim, D., Seidman, D. N., Helmink, R. C., Sun, E., & Tin, S. (2017). The effect of Nb on grain boundary segregation of B in high refractory Ni-based superalloys. Scripta Materialia, 138, 35-38. https://doi.org/10.1016/j.scriptamat.2017.05.028

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abstract = "Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 °C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of σ phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase.",

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AU - Antonov, Stoichko

AU - Huo, Jiajie

AU - Feng, Qiang

AU - Isheim, Dieter

AU - Seidman, David N

AU - Helmink, Randolph C.

AU - Sun, Eugene

AU - Tin, Sammy

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AB - Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 °C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of σ phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase.

KW - Atom probe tomography

KW - Grain boundaries

KW - Precipitation

KW - Superalloy

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