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Failure behaviors of 34Cr2Ni2Mo steel up to very high-cycle fatigue

Shijian Wang (Dongfang Electrical Machinery CO., Ltd., Deyang, China)
Qiyuan He (Dongfang Electrical Machinery CO., Ltd., Deyang, China)
Quanwei Liang (Dongfang Electrical Machinery CO., Ltd., Deyang, China)
Jie Cui (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)
Qing Jiang (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)
Chang Liu (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)
Chao He (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)
Lang Li (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)
Yao Chen (Department of Mechanics, Sichuan University, Chengdu, China) (College of Architecture and Environment, Sichuan University, Chengdu, China)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 2 August 2022

Issue publication date: 12 September 2022

150

Abstract

Purpose

The study aims to examine the effect of inclusions and inherent microstructure on fatigue behavior of 34Cr2Ni2Mo steel.

Design/methodology/approach

Fatigue behavior of 34Cr2Ni2Mo steel was investigated for up to 1E10 cycles.

Findings

Results showed that both inclusion and inherent microstructure have an influence on the crack initiation mechanism. Fatigue cracks mostly initiated from inclusions, whereas substrate-induced crack initiations were also observed. Fatigue life of inclusion-induced failures is mostly determined by the location of inclusions rather than the loading stress. The inherent microstructure seems to tolerate inclusions at a lower stress level in very high-cycle regime owing to the absence of internal inclusion-induced failure. For the substrate-induced crack initiations, high-density dislocations are found to be accumulated around the carbide particle-matrix interface, which may be the cause of crack initiation in the inherent structure due to strain localization.

Originality/value

The effect of inclusions and inherent microstructure on fatigue behavior of 34Cr2Ni2Mo steel up to 1E10 cycles.

Highlights

  • Fatigue failure occurs even at a lifetime of 5.76E9 cycles.

  • Surface inclusion induced premature failures.

  • Inherent microstructure tolerates inclusions at lower stress level.

  • Internal carbides promote substrate-induced crack initiations.

Keywords

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 12102280, 12002226 and 12072212), Natural Science Foundation of Sichuan Province (Nos. 2022NSFSC0337 and 2022NSFSC1977) and Fundamental Research Funds for Central Universities of China (No. 2021SCU12129). The authors also highly appreciate Dr. Yan Li (Department of Mechanics, Sichuan University) and Dr. Yang Liu (MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University) for helping with microstructure characterizations.

Citation

Wang, S., He, Q., Liang, Q., Cui, J., Jiang, Q., Liu, C., He, C., Li, L. and Chen, Y. (2022), "Failure behaviors of 34Cr2Ni2Mo steel up to very high-cycle fatigue", International Journal of Structural Integrity, Vol. 13 No. 5, pp. 829-844. https://doi.org/10.1108/IJSI-06-2022-0082

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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