Abstract
Shot peening can significantly improve the fatigue resistance of superalloys, but the effect on the tensile properties is more controversial. In this work, the surface morphology, subsurface microstructure, and high-temperature tensile properties of FGH4113A Ni-based powder metallurgy superalloy were systematically investigated at different shot peening intensities (0.1, 0.2, and 0.3 mmA) and shot peening coverages (100% and 200%). The results show that the surface roughness, surface microhardness, and thickness of the subsurface plastic deformation layer gradually increase with increasing shot peening intensity and shot peening coverage. Meanwhile, the percentage of small-angle grain boundaries from 0.04% quickly increases to about 35%. When the shot peening intensity increases to 0.3 mmA, it is accompanied by more defects such as peeling and surface layer peeling on the surface of the superalloy. The shot peening intensity and coverage also have an influence on the tensile properties of the FGH4113A superalloy at 700 °C. When the shot peening condition was 0.2 mmA-100%, the tensile strength, yield strength, and elongation of the superalloy at 700 °C were 1452 MPa, 1123 MPa, and 15.8%, respectively, which were 27 MPa, 29 MPa, and 4% higher than those before shot peening. When the shot peening intensity increased to 0.3 mmA, the yield strength decreased by nearly 60 MPa compared to shot peening at 0.2 mmA-100%. The evolution of tensile performance under different shot peening conditions was also analyzed and provided theoretical and data support for the selection of shot peening parameters.
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Acknowledgements
This work was supported by the National Science and Technology Major Project (2017-VI-0009-0080). A part of the work was also supported by the Key-Area Research and Development Program of Guang Dong Province (2019B010935001), Shenzhen Industry and Information Technology Bureau of Shenzhen Municipality (Project No. 201806071354163490), Shenzhen Science and Technology Plan (Project No. JSGG20210802093205015), and Shen zhen Peacock Plan (20150128085205453).
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LZ was contributed to conceptualization, methodology, investigation, formal analysis, data curation, and writing—review and editing. XF was contributed to methodology, formal analysis, and data curation. LX was contributed to methodology, investigation. HJ was contributed to conceptualization, supervision, project administration, funding acquisition, and writing—review and editing. JG was contributed to supervision, project administration, funding acquisition, and writing—review and editing.
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Zhu, L., Fan, X., Xiao, L. et al. Influence of shot peening on the microstructure and high-temperature tensile properties of a powder metallurgy Ni-based superalloy. J Mater Sci 58, 2838–2852 (2023). https://doi.org/10.1007/s10853-023-08182-3
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DOI: https://doi.org/10.1007/s10853-023-08182-3