Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition

Yuichiro Koizumi; Shou Suzuki; Takuma Otomo; Shingo Kurosu; Yunping Li; Hiroaki Matsumoto; Akihiko Chiba

doi:10.1016/j.intermet.2012.01.008

Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition

Yuichiro Koizumi, Shou Suzuki, Takuma Otomo, Shingo Kurosu, Yunping Li, Hiroaki Matsumoto, Akihiko Chiba

New Industry Creation Hatchery Center (NICHe)

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

1 Citation (Scopus)

Abstract

In this study, segregation at stacking faults (SFs) in a Co-Ni superalloy with the composition of Co-33Ni-20Cr-10Mo-xNb [wt%] (x = 0,1,2) has been investigated by phase-field simulation for clarifying the roles of each element in the Suzuki effect which is believed to be responsible for strain-aging. The simulation result suggested that Ni-depletion can be very significant in the absence of Nb, and the deviation in concentration can exceed 4 wt%. The stacking fault energy (SFE) was decreased from 35 mJ/m² to -775 mJ/m ² as a result of the segregation. Nb-addition enhanced the Cr-segregation significantly, however, it resulted in increase in SFE although the strain-aging can be enhanced by Nb-addition. The reasons for the discrepancy are discussed from the viewpoint of the effect of Nb-addition on the kinetics and energetics of Cr-segregation.

Original language	English
Pages (from-to)	52-57
Number of pages	6
Journal	Intermetallics
Volume	27
DOIs	https://doi.org/10.1016/j.intermet.2012.01.008
Publication status	Published - 2012 Aug

Keywords

B. Strain-aging
Co-Ni-based alloy
Phase-field method
Stacking fault
Suzuki effect

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10.1016/j.intermet.2012.01.008

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@article{dc221878d1324feba0db31122e3cc172,

title = "Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition",

abstract = "In this study, segregation at stacking faults (SFs) in a Co-Ni superalloy with the composition of Co-33Ni-20Cr-10Mo-xNb [wt%] (x = 0,1,2) has been investigated by phase-field simulation for clarifying the roles of each element in the Suzuki effect which is believed to be responsible for strain-aging. The simulation result suggested that Ni-depletion can be very significant in the absence of Nb, and the deviation in concentration can exceed 4 wt%. The stacking fault energy (SFE) was decreased from 35 mJ/m2 to -775 mJ/m 2 as a result of the segregation. Nb-addition enhanced the Cr-segregation significantly, however, it resulted in increase in SFE although the strain-aging can be enhanced by Nb-addition. The reasons for the discrepancy are discussed from the viewpoint of the effect of Nb-addition on the kinetics and energetics of Cr-segregation.",

keywords = "B. Strain-aging, Co-Ni-based alloy, Phase-field method, Stacking fault, Suzuki effect",

author = "Yuichiro Koizumi and Shou Suzuki and Takuma Otomo and Shingo Kurosu and Yunping Li and Hiroaki Matsumoto and Akihiko Chiba",

note = "Funding Information: This research was supported by a Regional Innovation Cluster Program 2010 and a Grant-in-Aid for Scientific Research Development from Ministry of Education, Culture, Sports, Science and Technology of Japan. Also, this work has been performed under the inter-university cooperative research program of the Center for Computational Materials Science, Institute for Materials Research, Tohoku University. Authors thank Prof. I. Ohnuma of Tohoku University for his professional knowledge on thermodynamic database of Co alloys.",

year = "2012",

month = aug,

doi = "10.1016/j.intermet.2012.01.008",

language = "English",

volume = "27",

pages = "52--57",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition

AU - Koizumi, Yuichiro

AU - Suzuki, Shou

AU - Otomo, Takuma

AU - Kurosu, Shingo

AU - Li, Yunping

AU - Matsumoto, Hiroaki

AU - Chiba, Akihiko

N1 - Funding Information: This research was supported by a Regional Innovation Cluster Program 2010 and a Grant-in-Aid for Scientific Research Development from Ministry of Education, Culture, Sports, Science and Technology of Japan. Also, this work has been performed under the inter-university cooperative research program of the Center for Computational Materials Science, Institute for Materials Research, Tohoku University. Authors thank Prof. I. Ohnuma of Tohoku University for his professional knowledge on thermodynamic database of Co alloys.

PY - 2012/8

Y1 - 2012/8

N2 - In this study, segregation at stacking faults (SFs) in a Co-Ni superalloy with the composition of Co-33Ni-20Cr-10Mo-xNb [wt%] (x = 0,1,2) has been investigated by phase-field simulation for clarifying the roles of each element in the Suzuki effect which is believed to be responsible for strain-aging. The simulation result suggested that Ni-depletion can be very significant in the absence of Nb, and the deviation in concentration can exceed 4 wt%. The stacking fault energy (SFE) was decreased from 35 mJ/m2 to -775 mJ/m 2 as a result of the segregation. Nb-addition enhanced the Cr-segregation significantly, however, it resulted in increase in SFE although the strain-aging can be enhanced by Nb-addition. The reasons for the discrepancy are discussed from the viewpoint of the effect of Nb-addition on the kinetics and energetics of Cr-segregation.

AB - In this study, segregation at stacking faults (SFs) in a Co-Ni superalloy with the composition of Co-33Ni-20Cr-10Mo-xNb [wt%] (x = 0,1,2) has been investigated by phase-field simulation for clarifying the roles of each element in the Suzuki effect which is believed to be responsible for strain-aging. The simulation result suggested that Ni-depletion can be very significant in the absence of Nb, and the deviation in concentration can exceed 4 wt%. The stacking fault energy (SFE) was decreased from 35 mJ/m2 to -775 mJ/m 2 as a result of the segregation. Nb-addition enhanced the Cr-segregation significantly, however, it resulted in increase in SFE although the strain-aging can be enhanced by Nb-addition. The reasons for the discrepancy are discussed from the viewpoint of the effect of Nb-addition on the kinetics and energetics of Cr-segregation.

KW - B. Strain-aging

KW - Co-Ni-based alloy

KW - Phase-field method

KW - Stacking fault

KW - Suzuki effect

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SP - 52

EP - 57

JO - Intermetallics

JF - Intermetallics

ER -

Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition

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Keywords

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