Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior

Hailong Qin; Zhongnan Bi; Ruiyao Zhang; Tung Lik Lee; Hongyao Yu; Hai Chi; Dongfeng Li; Hongbiao Dong; Jinhui Du; Ji Zhang

doi:10.1007/978-3-030-51834-9_69

Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior

Hailong Qin^*
, Zhongnan Bi
, Ruiyao Zhang
, Tung Lik Lee
, Hongyao Yu
, Hai Chi
, Dongfeng Li
, Hongbiao Dong
, Jinhui Du
, Ji Zhang

^*Corresponding author for this work

Metallurgy and Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The stress-induced variant selection (SIVS) of γ″ phase caused by thermo-mechanical coupling condition is studied systematically. The SIVS index f is devised and utilized to quantify the degree of SIVS via SEM image post-processing within <001> oriented grains. Applied stress condition does not affect the volume fraction, average size, and crystallographic orientation of the γ″ but changes the proportion of the three variants. The SIVS behavior of γ″ phase is dependent upon the applied stress direction and grain orientation. By considering the variation of the SIVS index with thermal aging and creep parameters, a causal relationship between degree of SIVS with temperature, stress, and time is elucidated. The yield strength and tensile strength at 650 °C decrease with the increase of SIVS degree. Contour map for the degree of SIVS is presented to evaluate the service temperature and stress of an Inconel 718 component. The formation mechanism of SIVS of γ” is proposed: the orienting effect of stress condition is appreciable only during Ostwald ripening, due to the change of the γ″/γ lattice mismatch.

Original language	English
Title of host publication	Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys
Editors	Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
Publisher	Springer
Pages	713-725
Number of pages	13
ISBN (Print)	9783030518332
DOIs	https://doi.org/10.1007/978-3-030-51834-9_69
Publication status	Published - 2020
Event	14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States Duration: 12 Sept 2021 → 16 Sept 2021

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	14th International Symposium on Superalloys, Superalloys 2021
Country/Territory	United States
City	Seven Springs
Period	12/09/21 → 16/09/21

Bibliographical note

Publisher Copyright:
© 2020, The Minerals, Metals & Materials Society.

Keywords

Inconel 718
Microstructural degradation
Stress-induced variant selection
Thermo-mechanical coupling

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/978-3-030-51834-9_69

Cite this

Qin, H., Bi, Z., Zhang, R., Lee, T. L., Yu, H., Chi, H., Li, D., Dong, H., Du, J., & Zhang, J. (2020). Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior. In S. Tin, M. Hardy, J. Clews, J. Cormier, Q. Feng, J. Marcin, C. O'Brien, & A. Suzuki (Eds.), Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys (pp. 713-725). (Minerals, Metals and Materials Series). Springer. https://doi.org/10.1007/978-3-030-51834-9_69

Qin, Hailong ; Bi, Zhongnan ; Zhang, Ruiyao et al. / Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service : Mechanism and Effects on Mechanical Behavior. Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. editor / Sammy Tin ; Mark Hardy ; Justin Clews ; Jonathan Cormier ; Qiang Feng ; John Marcin ; Chris O'Brien ; Akane Suzuki. Springer, 2020. pp. 713-725 (Minerals, Metals and Materials Series).

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title = "Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior",

abstract = "The stress-induced variant selection (SIVS) of γ″ phase caused by thermo-mechanical coupling condition is studied systematically. The SIVS index f is devised and utilized to quantify the degree of SIVS via SEM image post-processing within <001> oriented grains. Applied stress condition does not affect the volume fraction, average size, and crystallographic orientation of the γ″ but changes the proportion of the three variants. The SIVS behavior of γ″ phase is dependent upon the applied stress direction and grain orientation. By considering the variation of the SIVS index with thermal aging and creep parameters, a causal relationship between degree of SIVS with temperature, stress, and time is elucidated. The yield strength and tensile strength at 650 °C decrease with the increase of SIVS degree. Contour map for the degree of SIVS is presented to evaluate the service temperature and stress of an Inconel 718 component. The formation mechanism of SIVS of γ” is proposed: the orienting effect of stress condition is appreciable only during Ostwald ripening, due to the change of the γ″/γ lattice mismatch.",

keywords = "Inconel 718, Microstructural degradation, Stress-induced variant selection, Thermo-mechanical coupling",

author = "Hailong Qin and Zhongnan Bi and Ruiyao Zhang and Lee, \{Tung Lik\} and Hongyao Yu and Hai Chi and Dongfeng Li and Hongbiao Dong and Jinhui Du and Ji Zhang",

note = "Publisher Copyright: {\textcopyright} 2020, The Minerals, Metals \& Materials Society.; 14th International Symposium on Superalloys, Superalloys 2021 ; Conference date: 12-09-2021 Through 16-09-2021",

year = "2020",

doi = "10.1007/978-3-030-51834-9\_69",

language = "English",

isbn = "9783030518332",

series = "Minerals, Metals and Materials Series",

publisher = "Springer",

pages = "713--725",

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booktitle = "Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys",

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Qin, H, Bi, Z, Zhang, R, Lee, TL, Yu, H, Chi, H, Li, D, Dong, H, Du, J & Zhang, J 2020, Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior. in S Tin, M Hardy, J Clews, J Cormier, Q Feng, J Marcin, C O'Brien & A Suzuki (eds), Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. Minerals, Metals and Materials Series, Springer, pp. 713-725, 14th International Symposium on Superalloys, Superalloys 2021, Seven Springs, United States, 12/09/21. https://doi.org/10.1007/978-3-030-51834-9_69

Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior. / Qin, Hailong; Bi, Zhongnan; Zhang, Ruiyao et al.
Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. ed. / Sammy Tin; Mark Hardy; Justin Clews; Jonathan Cormier; Qiang Feng; John Marcin; Chris O'Brien; Akane Suzuki. Springer, 2020. p. 713-725 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service

T2 - 14th International Symposium on Superalloys, Superalloys 2021

AU - Qin, Hailong

AU - Bi, Zhongnan

AU - Zhang, Ruiyao

AU - Lee, Tung Lik

AU - Yu, Hongyao

AU - Chi, Hai

AU - Li, Dongfeng

AU - Dong, Hongbiao

AU - Du, Jinhui

AU - Zhang, Ji

PY - 2020

Y1 - 2020

N2 - The stress-induced variant selection (SIVS) of γ″ phase caused by thermo-mechanical coupling condition is studied systematically. The SIVS index f is devised and utilized to quantify the degree of SIVS via SEM image post-processing within <001> oriented grains. Applied stress condition does not affect the volume fraction, average size, and crystallographic orientation of the γ″ but changes the proportion of the three variants. The SIVS behavior of γ″ phase is dependent upon the applied stress direction and grain orientation. By considering the variation of the SIVS index with thermal aging and creep parameters, a causal relationship between degree of SIVS with temperature, stress, and time is elucidated. The yield strength and tensile strength at 650 °C decrease with the increase of SIVS degree. Contour map for the degree of SIVS is presented to evaluate the service temperature and stress of an Inconel 718 component. The formation mechanism of SIVS of γ” is proposed: the orienting effect of stress condition is appreciable only during Ostwald ripening, due to the change of the γ″/γ lattice mismatch.

AB - The stress-induced variant selection (SIVS) of γ″ phase caused by thermo-mechanical coupling condition is studied systematically. The SIVS index f is devised and utilized to quantify the degree of SIVS via SEM image post-processing within <001> oriented grains. Applied stress condition does not affect the volume fraction, average size, and crystallographic orientation of the γ″ but changes the proportion of the three variants. The SIVS behavior of γ″ phase is dependent upon the applied stress direction and grain orientation. By considering the variation of the SIVS index with thermal aging and creep parameters, a causal relationship between degree of SIVS with temperature, stress, and time is elucidated. The yield strength and tensile strength at 650 °C decrease with the increase of SIVS degree. Contour map for the degree of SIVS is presented to evaluate the service temperature and stress of an Inconel 718 component. The formation mechanism of SIVS of γ” is proposed: the orienting effect of stress condition is appreciable only during Ostwald ripening, due to the change of the γ″/γ lattice mismatch.

KW - Inconel 718

KW - Microstructural degradation

KW - Stress-induced variant selection

KW - Thermo-mechanical coupling

UR - https://www.scopus.com/pages/publications/85091279573

U2 - 10.1007/978-3-030-51834-9_69

DO - 10.1007/978-3-030-51834-9_69

M3 - Conference contribution

AN - SCOPUS:85091279573

SN - 9783030518332

T3 - Minerals, Metals and Materials Series

SP - 713

EP - 725

BT - Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys

A2 - Tin, Sammy

A2 - Hardy, Mark

A2 - Clews, Justin

A2 - Cormier, Jonathan

A2 - Feng, Qiang

A2 - Marcin, John

A2 - O'Brien, Chris

A2 - Suzuki, Akane

PB - Springer

Y2 - 12 September 2021 through 16 September 2021

ER -

Qin H, Bi Z, Zhang R, Lee TL, Yu H, Chi H et al. Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior. In Tin S, Hardy M, Clews J, Cormier J, Feng Q, Marcin J, O'Brien C, Suzuki A, editors, Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. Springer. 2020. p. 713-725. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-030-51834-9_69

Stress-Induced Variant Selection of γ″ Phase in Inconel 718 During Service: Mechanism and Effects on Mechanical Behavior

Abstract

Publication series

Conference

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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Cite this