Microstructure evolution during thermal aging of Inconel 718

R. S. Devarapalli; E. Marin; J. Cormier; C. Le Gall; J. M. Franchet; M. Jouiad

Microstructure evolution during thermal aging of Inconel 718

R. S. Devarapalli, E. Marin, J. Cormier, C. Le Gall, J. M. Franchet, M. Jouiad

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

Abstract

The Inconel 718 superalloy was subjected to isothermal and cyclic thermal annealing at 750°C to assess its expected use at higher temperatures. Microstructure evaluation during isothermal annealing and thermal cycling was investigated by different imaging techniques. According to High Resolution Scanning and Transmission Electron Microscopy (HRSEM & HRTEM) results, all the annealed samples showed the coarsening of γ', γ" and 8 precipitates, however, the total volume fraction of these precipitates remains the same for all heat treatment conditions. Using backscattered electrons images the size of γ', γ" and 8 phases were measured and correlated with annealing time. The most striking result is the impact of thermal cycling which accelerates the growth inside the grains of γ" phase and at the vicinity of the grain-boundaries leading to its transformation to 8 phase, which induces a fast decrease of the mechanical properties of thermally cycled specimens compared to isothermally aged ones. A close investigation showed that the γ" phase grows by ledge mechanism. Moreover, Electron backscattered diffraction analysis (EBSD) revealed no significant grain size change during all annealed times.

Original language	English
Title of host publication	TMS Annual Meeting
Editors	Shadia Jamil Ikhmayies, Shadia Jamil Ikhmayies, Bowen Li, John S. Carpenter, John S. Carpenter, Jiann-Yang Hwang, Jiann-Yang Hwang, Sergio Neves Monteiro, Jian Li, Donato Firrao, Donato Firrao, Donato Firrao, Donato Firrao, Mingming Zhang, Zhiwei Peng, Zhiwei Peng, Zhiwei Peng, Juan Pablo Escobedo-Diaz, Juan Pablo Escobedo-Diaz, Chenguang Bai
Publisher	Minerals, Metals and Materials Society
Pages	11-18
Number of pages	8
Edition	CONFCODENUMBER
ISBN (Electronic)	9781119264392
State	Published - 2016
Externally published	Yes
Event	Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition - Nashville, United States Duration: 14 Feb 2016 → 18 Feb 2016

Publication series

Name	TMS Annual Meeting
Number	CONFCODENUMBER
Volume	0

Conference

Conference	Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition
Country/Territory	United States
City	Nashville
Period	14/02/16 → 18/02/16

Keywords

Hrtem of 718 alloy
Inconel 718 alloy
Ledge mechanism
Thermal treatment

Cite this

Devarapalli, R. S., Marin, E., Cormier, J., Le Gall, C., Franchet, J. M., & Jouiad, M. (2016). Microstructure evolution during thermal aging of Inconel 718. In S. J. Ikhmayies, S. J. Ikhmayies, B. Li, J. S. Carpenter, J. S. Carpenter, J.-Y. Hwang, J.-Y. Hwang, S. N. Monteiro, J. Li, D. Firrao, D. Firrao, D. Firrao, D. Firrao, M. Zhang, Z. Peng, Z. Peng, Z. Peng, J. P. Escobedo-Diaz, J. P. Escobedo-Diaz, & C. Bai (Eds.), TMS Annual Meeting (CONFCODENUMBER ed., pp. 11-18). (TMS Annual Meeting; Vol. 0, No. CONFCODENUMBER). Minerals, Metals and Materials Society.

Devarapalli, R. S. ; Marin, E. ; Cormier, J. et al. / Microstructure evolution during thermal aging of Inconel 718. TMS Annual Meeting. editor / Shadia Jamil Ikhmayies ; Shadia Jamil Ikhmayies ; Bowen Li ; John S. Carpenter ; John S. Carpenter ; Jiann-Yang Hwang ; Jiann-Yang Hwang ; Sergio Neves Monteiro ; Jian Li ; Donato Firrao ; Donato Firrao ; Donato Firrao ; Donato Firrao ; Mingming Zhang ; Zhiwei Peng ; Zhiwei Peng ; Zhiwei Peng ; Juan Pablo Escobedo-Diaz ; Juan Pablo Escobedo-Diaz ; Chenguang Bai. CONFCODENUMBER. ed. Minerals, Metals and Materials Society, 2016. pp. 11-18 (TMS Annual Meeting; CONFCODENUMBER).

@inproceedings{a96db3b63c62431293f7ca75d76dab07,

title = "Microstructure evolution during thermal aging of Inconel 718",

abstract = "The Inconel 718 superalloy was subjected to isothermal and cyclic thermal annealing at 750°C to assess its expected use at higher temperatures. Microstructure evaluation during isothermal annealing and thermal cycling was investigated by different imaging techniques. According to High Resolution Scanning and Transmission Electron Microscopy (HRSEM & HRTEM) results, all the annealed samples showed the coarsening of γ', γ{"} and 8 precipitates, however, the total volume fraction of these precipitates remains the same for all heat treatment conditions. Using backscattered electrons images the size of γ', γ{"} and 8 phases were measured and correlated with annealing time. The most striking result is the impact of thermal cycling which accelerates the growth inside the grains of γ{"} phase and at the vicinity of the grain-boundaries leading to its transformation to 8 phase, which induces a fast decrease of the mechanical properties of thermally cycled specimens compared to isothermally aged ones. A close investigation showed that the γ{"} phase grows by ledge mechanism. Moreover, Electron backscattered diffraction analysis (EBSD) revealed no significant grain size change during all annealed times.",

keywords = "Hrtem of 718 alloy, Inconel 718 alloy, Ledge mechanism, Thermal treatment",

author = "Devarapalli, {R. S.} and E. Marin and J. Cormier and {Le Gall}, C. and Franchet, {J. M.} and M. Jouiad",

year = "2016",

language = "Ingl{\'e}s",

series = "TMS Annual Meeting",

publisher = "Minerals, Metals and Materials Society",

number = "CONFCODENUMBER",

pages = "11--18",

editor = "Ikhmayies, {Shadia Jamil} and Ikhmayies, {Shadia Jamil} and Bowen Li and Carpenter, {John S.} and Carpenter, {John S.} and Jiann-Yang Hwang and Jiann-Yang Hwang and Monteiro, {Sergio Neves} and Jian Li and Donato Firrao and Donato Firrao and Donato Firrao and Donato Firrao and Mingming Zhang and Zhiwei Peng and Zhiwei Peng and Zhiwei Peng and Escobedo-Diaz, {Juan Pablo} and Escobedo-Diaz, {Juan Pablo} and Chenguang Bai",

booktitle = "TMS Annual Meeting",

address = "Estados Unidos",

edition = "CONFCODENUMBER",

note = "Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition ; Conference date: 14-02-2016 Through 18-02-2016",

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Devarapalli, RS, Marin, E, Cormier, J, Le Gall, C, Franchet, JM & Jouiad, M 2016, Microstructure evolution during thermal aging of Inconel 718. in SJ Ikhmayies, SJ Ikhmayies, B Li, JS Carpenter, JS Carpenter, J-Y Hwang, J-Y Hwang, SN Monteiro, J Li, D Firrao, D Firrao, D Firrao, D Firrao, M Zhang, Z Peng, Z Peng, Z Peng, JP Escobedo-Diaz, JP Escobedo-Diaz & C Bai (eds), TMS Annual Meeting. CONFCODENUMBER edn, TMS Annual Meeting, no. CONFCODENUMBER, vol. 0, Minerals, Metals and Materials Society, pp. 11-18, Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition, Nashville, United States, 14/02/16.

Microstructure evolution during thermal aging of Inconel 718. / Devarapalli, R. S.; Marin, E.; Cormier, J. et al.
TMS Annual Meeting. ed. / Shadia Jamil Ikhmayies; Shadia Jamil Ikhmayies; Bowen Li; John S. Carpenter; John S. Carpenter; Jiann-Yang Hwang; Jiann-Yang Hwang; Sergio Neves Monteiro; Jian Li; Donato Firrao; Donato Firrao; Donato Firrao; Donato Firrao; Mingming Zhang; Zhiwei Peng; Zhiwei Peng; Zhiwei Peng; Juan Pablo Escobedo-Diaz; Juan Pablo Escobedo-Diaz; Chenguang Bai. CONFCODENUMBER. ed. Minerals, Metals and Materials Society, 2016. p. 11-18 (TMS Annual Meeting; Vol. 0, No. CONFCODENUMBER).

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

TY - GEN

T1 - Microstructure evolution during thermal aging of Inconel 718

AU - Devarapalli, R. S.

AU - Marin, E.

AU - Cormier, J.

AU - Le Gall, C.

AU - Franchet, J. M.

AU - Jouiad, M.

PY - 2016

Y1 - 2016

N2 - The Inconel 718 superalloy was subjected to isothermal and cyclic thermal annealing at 750°C to assess its expected use at higher temperatures. Microstructure evaluation during isothermal annealing and thermal cycling was investigated by different imaging techniques. According to High Resolution Scanning and Transmission Electron Microscopy (HRSEM & HRTEM) results, all the annealed samples showed the coarsening of γ', γ" and 8 precipitates, however, the total volume fraction of these precipitates remains the same for all heat treatment conditions. Using backscattered electrons images the size of γ', γ" and 8 phases were measured and correlated with annealing time. The most striking result is the impact of thermal cycling which accelerates the growth inside the grains of γ" phase and at the vicinity of the grain-boundaries leading to its transformation to 8 phase, which induces a fast decrease of the mechanical properties of thermally cycled specimens compared to isothermally aged ones. A close investigation showed that the γ" phase grows by ledge mechanism. Moreover, Electron backscattered diffraction analysis (EBSD) revealed no significant grain size change during all annealed times.

AB - The Inconel 718 superalloy was subjected to isothermal and cyclic thermal annealing at 750°C to assess its expected use at higher temperatures. Microstructure evaluation during isothermal annealing and thermal cycling was investigated by different imaging techniques. According to High Resolution Scanning and Transmission Electron Microscopy (HRSEM & HRTEM) results, all the annealed samples showed the coarsening of γ', γ" and 8 precipitates, however, the total volume fraction of these precipitates remains the same for all heat treatment conditions. Using backscattered electrons images the size of γ', γ" and 8 phases were measured and correlated with annealing time. The most striking result is the impact of thermal cycling which accelerates the growth inside the grains of γ" phase and at the vicinity of the grain-boundaries leading to its transformation to 8 phase, which induces a fast decrease of the mechanical properties of thermally cycled specimens compared to isothermally aged ones. A close investigation showed that the γ" phase grows by ledge mechanism. Moreover, Electron backscattered diffraction analysis (EBSD) revealed no significant grain size change during all annealed times.

KW - Hrtem of 718 alloy

KW - Inconel 718 alloy

KW - Ledge mechanism

KW - Thermal treatment

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M3 - Contribución a la conferencia

AN - SCOPUS:85002579192

T3 - TMS Annual Meeting

SP - 11

EP - 18

BT - TMS Annual Meeting

A2 - Ikhmayies, Shadia Jamil

A2 - Li, Bowen

A2 - Carpenter, John S.

A2 - Hwang, Jiann-Yang

A2 - Monteiro, Sergio Neves

A2 - Li, Jian

A2 - Firrao, Donato

A2 - Zhang, Mingming

A2 - Peng, Zhiwei

A2 - Escobedo-Diaz, Juan Pablo

A2 - Bai, Chenguang

PB - Minerals, Metals and Materials Society

T2 - Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition

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Devarapalli RS, Marin E, Cormier J, Le Gall C, Franchet JM, Jouiad M. Microstructure evolution during thermal aging of Inconel 718. In Ikhmayies SJ, Ikhmayies SJ, Li B, Carpenter JS, Carpenter JS, Hwang JY, Hwang JY, Monteiro SN, Li J, Firrao D, Firrao D, Firrao D, Firrao D, Zhang M, Peng Z, Peng Z, Peng Z, Escobedo-Diaz JP, Escobedo-Diaz JP, Bai C, editors, TMS Annual Meeting. CONFCODENUMBER ed. Minerals, Metals and Materials Society. 2016. p. 11-18. (TMS Annual Meeting; CONFCODENUMBER).

Microstructure evolution during thermal aging of Inconel 718

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