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Age Hardenable Nickel-Based Alloy Developments and Research for New High Temperature Power Cycles Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Stress Relaxation Behavior Comparison of Typical Nickel-Base Superalloys for Fasteners

Authors : He Jiang, Jing Yang, Jianxin Dong, Maicang Zhang, Zhihao Yao, Xishan Xie

Published in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Publisher: Springer International Publishing

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Abstract

In the present work, stress relaxation behavior of three typical nickel-base Superalloys: Alloy 718, Waspaloy and AEREX 350, were investigated in a temperature range of 600–800 °C for up to 10 h. The effects of stress relaxation parameters on behavior were analyzed and stress relaxation characteristics of the three superalloys are compared and mechanisms revealed by FESEM and TEM observation. The study results show that the stress relaxation property of Alloy 718 is very sensitive to temperature. It is very stable at 650 °C, but decreases extremely with temperature increasing to 750 °C as a result of serious microstructure degeneration. Moreover, stress relaxation stability is related with initial stress, and appropriate increase of initial stress under normal service temperature can increase the stress relaxation limit of Alloy 718. The stress relaxation resistance of Waspaloy decreases with increasing temperature. The increase of initial stress and initial strain is beneficial for stress relaxation resistance of Waspaloy, but the influencing degree is related with temperature. Furthermore, Waspaloy with heat treatment A (1020 °C × 4 h/AC + 845 °C × 4 h/AC + 760 °C × 16 h/AC) shows better stress relaxation resistance than that with heat treatment B (1080 °C × 4 h/AC + 845 °C × 24 h/AC + 760 °C × 16 h/AC). In addition, stress relaxation stability of AEREX 350 is the best among the three superalloys in the temperature range of 600–800 °C on the whole. The combined effect of γ′ phase and η phase guarantee the stress relaxation property of AEREX 350.

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previous chapter Strain Controlled Low Cycle Fatigue Behavior of U720Li Disk Superalloy Above 700 °C
next chapter Study of the Oxidation Assisted Intergranular Cracking Mechanism on a Ni-Base Superalloy
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Metadata
Title
Stress Relaxation Behavior Comparison of Typical Nickel-Base Superalloys for Fasteners
Authors
He Jiang
Jing Yang
Jianxin Dong
Maicang Zhang
Zhihao Yao
Xishan Xie
Copyright Year
2018
Book
Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Print ISBN: 978-3-319-89479-9

Electronic ISBN: 978-3-319-89480-5

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-89480-5_53

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