Rupture mechanism of GH2984 crept at temperature between 700-750 ℃

Jing Bo Yan; Yue Feng Gu; Yi Min Gao; Fei Sun; Xin Bao Zhao; Ying Ying Dang; Zhen Yang; Hong Fei Yin

Rupture mechanism of GH2984 crept at temperature between 700-750 ℃

Jing Bo Yan, Yue Feng Gu, Yi Min Gao, Fei Sun, Xin Bao Zhao, Ying Ying Dang, Zhen Yang, Hong Fei Yin

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

Abstract

The microstructure evolution and its effect on the properties of GH2984 alloy between 700 and 750 ℃ were investigated. The results show the rupture life is only about 160 h when the alloy was crept at 700 ℃ and 300 MPa. The stress concentration and consequently crack nucleation and propagation are the main reason for failure of the alloy. When the stress decreases, the stress concentration is released by the grain rotation. It inhibits the crack nucleation and thus extends the alloy rupture life obviously. However, accompanied with the grain deformation proceeding, the dynamic recrystallization occurs when the creep temperature increases. This leads to the increases of the alloy creep ductility, but decreases the alloy rupture life because of the lower work hardening extent.

Original language	English
Pages (from-to)	551-559
Number of pages	9
Journal	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume	26
Issue number	3
Publication status	Published - 2016 Mar 1
Externally published	Yes

Keywords

Creep
Dynamic recrystallization
Fe-Ni-base superalloy
Stress concentration

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys
Materials Chemistry

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title = "Rupture mechanism of GH2984 crept at temperature between 700-750 ℃",

abstract = "The microstructure evolution and its effect on the properties of GH2984 alloy between 700 and 750 ℃ were investigated. The results show the rupture life is only about 160 h when the alloy was crept at 700 ℃ and 300 MPa. The stress concentration and consequently crack nucleation and propagation are the main reason for failure of the alloy. When the stress decreases, the stress concentration is released by the grain rotation. It inhibits the crack nucleation and thus extends the alloy rupture life obviously. However, accompanied with the grain deformation proceeding, the dynamic recrystallization occurs when the creep temperature increases. This leads to the increases of the alloy creep ductility, but decreases the alloy rupture life because of the lower work hardening extent.",

keywords = "Creep, Dynamic recrystallization, Fe-Ni-base superalloy, Stress concentration",

author = "Yan, {Jing Bo} and Gu, {Yue Feng} and Gao, {Yi Min} and Fei Sun and Zhao, {Xin Bao} and Dang, {Ying Ying} and Zhen Yang and Yin, {Hong Fei}",

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issn = "1004-0609",

publisher = "Central South University of Technology",

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TY - JOUR

T1 - Rupture mechanism of GH2984 crept at temperature between 700-750 ℃

AU - Yan, Jing Bo

AU - Gu, Yue Feng

AU - Gao, Yi Min

AU - Sun, Fei

AU - Zhao, Xin Bao

AU - Dang, Ying Ying

AU - Yang, Zhen

AU - Yin, Hong Fei

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The microstructure evolution and its effect on the properties of GH2984 alloy between 700 and 750 ℃ were investigated. The results show the rupture life is only about 160 h when the alloy was crept at 700 ℃ and 300 MPa. The stress concentration and consequently crack nucleation and propagation are the main reason for failure of the alloy. When the stress decreases, the stress concentration is released by the grain rotation. It inhibits the crack nucleation and thus extends the alloy rupture life obviously. However, accompanied with the grain deformation proceeding, the dynamic recrystallization occurs when the creep temperature increases. This leads to the increases of the alloy creep ductility, but decreases the alloy rupture life because of the lower work hardening extent.

AB - The microstructure evolution and its effect on the properties of GH2984 alloy between 700 and 750 ℃ were investigated. The results show the rupture life is only about 160 h when the alloy was crept at 700 ℃ and 300 MPa. The stress concentration and consequently crack nucleation and propagation are the main reason for failure of the alloy. When the stress decreases, the stress concentration is released by the grain rotation. It inhibits the crack nucleation and thus extends the alloy rupture life obviously. However, accompanied with the grain deformation proceeding, the dynamic recrystallization occurs when the creep temperature increases. This leads to the increases of the alloy creep ductility, but decreases the alloy rupture life because of the lower work hardening extent.

KW - Creep

KW - Dynamic recrystallization

KW - Fe-Ni-base superalloy

KW - Stress concentration

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