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Influence of Strain Aging on Fatigue Behavior and Structural Evolution of P91 Steel

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Abstract

Research on fatigue behavior and microstructural evolution of P91 steel under pre-dynamic strain aging conditions (pre-DSA), and strain aging (SA) conditions at 550 °C has been carried out, and the experimental results were compared with the pure fatigue (PF) results, also at 550 °C. The comparison indicated that, under various strain amplitudes, the fatigue life of P91 at 550 °C decreased after pre-DSA or SA treatments relative to PF, and that the effect of the pre-DSA treatment was more significant. The SA treatment induced the localization of plastic deformation, creating obvious stress concentrations on the surface that led to the initiation of multiple cracks which decreased the fatigue life of P91. Transmission electron microscopy analysis of P91 indicated that pre-DSA promoted higher dislocation density and increased the mechanical strength, while SA decreased the dislocation density and the mechanical strength. During fatigue tests, the martensite laths in pre-DSA and SA specimens recovered more completely relative to those under PF, and the recovery extent was directly related with the decrease of fatigue life.

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Acknowledgments

Thanks for the support by National Science & Technology Pillar Program during the 12th Five-year Plan Period (No.2011BAK06B03) and the National High Technology Research and Development Program of China (No.2012AA040103) and the Anhui Province Natural Science Research Project (KJ2016SD09).

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Authors and Affiliations

  1. School of Mechanical Engineering, Anhui University of Technology, Ma’anshan, 243002, People’s Republic of China

    Zheng Qiankun, Shi Yafei, Rao Sixian, Ye Haoyu & Feng Jianyou

  2. Hefei General Machinery Research Institute, National Technical Research Center on Safety Engineering of Pressure Vessel and Pipelines, Hefei, 230031, People’s Republic of China

    Rao Sixian

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  1. Zheng Qiankun
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  2. Shi Yafei
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  3. Rao Sixian
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  4. Ye Haoyu
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Correspondence to Rao Sixian.

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Qiankun, Z., Yafei, S., Sixian, R. et al. Influence of Strain Aging on Fatigue Behavior and Structural Evolution of P91 Steel. Metallogr. Microstruct. Anal. 6, 390–397 (2017). https://doi.org/10.1007/s13632-017-0377-2

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  • DOI: https://doi.org/10.1007/s13632-017-0377-2

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