High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718PlusTM

Andrew Merrison; Hangyue Li; Paul Bowen; Wei Li

doi:10.1007/978-3-030-51834-9_58

High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM

Andrew Merrison, Hangyue Li^*, Paul Bowen, Wei Li

^*Corresponding author for this work

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

Abstract

The high temperature dwell fatigue crack growth behaviours of 30% cold-drawn and direct-aged ATI 718Plus^TM were studied. This was compared to an annealed and direct aged variant of the same material. This was in order to rationalise the effects of cold work. Tests were conducted at 650 °C using different dwell times, in air and in relative vacuum, at R = 0.1. It was found that the cold-worked and direct-aged condition produced slower dwell fatigue crack growth rates in all tests. This has been linked to the larger elongated grain morphology and the dislocation structure retained after cold working. Increased crack tortuosity and roughness-induced crack closure are considered to enhance the cycle-dependent crack growth properties. Superior resistance to environmentally assisted intergranular failure is related to greater crack tip stress relaxation and more homogeneous grain boundary deformation.

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	603-612
Number of pages	10
ISBN (Print)	9783030518332
DOIs	https://doi.org/10.1007/978-3-030-51834-9_58
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

718
718plus
Cold work
Fasteners
Fatigue

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_58

Cite this

Merrison, A., Li, H., Bowen, P., & Li, W. (2020). High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM. 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. 603-612). (Minerals, Metals and Materials Series). Springer. https://doi.org/10.1007/978-3-030-51834-9_58

Merrison, Andrew ; Li, Hangyue ; Bowen, Paul et al. / High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM. 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. 603-612 (Minerals, Metals and Materials Series).

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title = "High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718PlusTM",

abstract = "The high temperature dwell fatigue crack growth behaviours of 30% cold-drawn and direct-aged ATI 718PlusTM were studied. This was compared to an annealed and direct aged variant of the same material. This was in order to rationalise the effects of cold work. Tests were conducted at 650 °C using different dwell times, in air and in relative vacuum, at R = 0.1. It was found that the cold-worked and direct-aged condition produced slower dwell fatigue crack growth rates in all tests. This has been linked to the larger elongated grain morphology and the dislocation structure retained after cold working. Increased crack tortuosity and roughness-induced crack closure are considered to enhance the cycle-dependent crack growth properties. Superior resistance to environmentally assisted intergranular failure is related to greater crack tip stress relaxation and more homogeneous grain boundary deformation.",

keywords = "718, 718plus, Cold work, Fasteners, Fatigue",

author = "Andrew Merrison and Hangyue Li and Paul Bowen and Wei Li",

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doi = "10.1007/978-3-030-51834-9_58",

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Merrison, A, Li, H , Bowen, P & Li, W 2020, High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM. 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. 603-612, 14th International Symposium on Superalloys, Superalloys 2021, Seven Springs, United States, 12/09/21. https://doi.org/10.1007/978-3-030-51834-9_58

High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM. / Merrison, Andrew; Li, Hangyue ; Bowen, Paul 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. 603-612 (Minerals, Metals and Materials Series).

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

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T1 - High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718PlusTM

AU - Merrison, Andrew

AU - Li, Hangyue

AU - Bowen, Paul

AU - Li, Wei

PY - 2020

Y1 - 2020

N2 - The high temperature dwell fatigue crack growth behaviours of 30% cold-drawn and direct-aged ATI 718PlusTM were studied. This was compared to an annealed and direct aged variant of the same material. This was in order to rationalise the effects of cold work. Tests were conducted at 650 °C using different dwell times, in air and in relative vacuum, at R = 0.1. It was found that the cold-worked and direct-aged condition produced slower dwell fatigue crack growth rates in all tests. This has been linked to the larger elongated grain morphology and the dislocation structure retained after cold working. Increased crack tortuosity and roughness-induced crack closure are considered to enhance the cycle-dependent crack growth properties. Superior resistance to environmentally assisted intergranular failure is related to greater crack tip stress relaxation and more homogeneous grain boundary deformation.

AB - The high temperature dwell fatigue crack growth behaviours of 30% cold-drawn and direct-aged ATI 718PlusTM were studied. This was compared to an annealed and direct aged variant of the same material. This was in order to rationalise the effects of cold work. Tests were conducted at 650 °C using different dwell times, in air and in relative vacuum, at R = 0.1. It was found that the cold-worked and direct-aged condition produced slower dwell fatigue crack growth rates in all tests. This has been linked to the larger elongated grain morphology and the dislocation structure retained after cold working. Increased crack tortuosity and roughness-induced crack closure are considered to enhance the cycle-dependent crack growth properties. Superior resistance to environmentally assisted intergranular failure is related to greater crack tip stress relaxation and more homogeneous grain boundary deformation.

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SN - 9783030518332

T3 - Minerals, Metals and Materials Series

SP - 603

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

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A2 - Clews, Justin

A2 - Cormier, Jonathan

A2 - Feng, Qiang

A2 - Marcin, John

A2 - O'Brien, Chris

A2 - Suzuki, Akane

PB - Springer

T2 - 14th International Symposium on Superalloys, Superalloys 2021

Y2 - 12 September 2021 through 16 September 2021

ER -

Merrison A, Li H , Bowen P, Li W. High Temperature Dwell Fatigue Crack Growth in Cold-Worked and Direct-Aged 718Plus^TM. 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. 603-612. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-030-51834-9_58