Abstract
GCr15-bearing steel is widely used in generator bearings. To improve its mechanical properties, the cryogenic treatment and laser-peening (CT + LP) composite strengthening process and properties of GCr15-bearing steel were studied in this paper. The microstructure, residual stress distribution and nanoindentation properties of GCr15-bearing steel under CT + LP composite strengthening were studied by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray stress analyzer and nanoindentation instrument. The experimental results showed that the residual compressive stress value and FWHM (full width at half maximum) value of the surface of GCr15-bearing steel increased after CT + LP composite strengthening, and the microstructure characteristics such as dislocation entanglement, proliferation, subgrain boundary and nanocrystalline appeared inside the CT + LP specimen. The nano-hardness and elastic modulus of CT + LP sample were 6.55 and 221.95 GPa, respectively, which were 12.94% and 32.61% higher than that of the untreated sample, respectively. The nanoindentation properties and deformation resistance of GCr15-bearing steel were improved.
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Funding
This work was funded by the Wenzhou Science and Technology Bureau Major Science and Technology Special Project (ZG2019002), the Zhejiang Provincial Natural Science Foundation of China (LY20E050027), the Innovation Fund of Wenzhou University Rui’an Graduate College (YC202212010), and the Innovation Fund of Wenzhou University Rui’an Graduate College (YC202212023).
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AF: methodology, investigation, writing—original draft preparation, writing—review and editing, BL: methodology, investigation, writing—original draft preparation, YW: data curation, writing—review and editing, GX: conceptualization, methodology, writing—review and editing, CC: methodology, data curation. XP: data curation.
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Feng, A., Liu, B., Wei, Y. et al. Microstructure, residual stress, and nanoindentation properties of GCr15-bearing steel by cryogenic treatment and laser-peening composite strengthening. Appl. Phys. A 129, 228 (2023). https://doi.org/10.1007/s00339-023-06500-9
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DOI: https://doi.org/10.1007/s00339-023-06500-9