Abstract
This study presents a comprehensive and comparative investigation on creep-feed grinding (CFG) of single crystal nickel-base turbine blade fir-tree roots with and without surface burn by using alumina abrasive wheels, in terms of tool wear, grinding force, temperature, and surface integrity. For both cases (i.e., with and without grinding burn), the low grinding ratios of below 1.6 are obtained, suggesting the rapid radial tool wear and the high difficulty for alumina abrasive wheels during grinding. Moreover, the coupling effects of blade root structure shape and grinding conditions are the most predominant at the second grinding step, which produces the largest grinding force and highest grinding temperature. Meantime, the defect-free surfaces and slight microstructural changes are found when grinding burn is absent. However, various defects are produced if grinding burn occurs, including the surface defects (i.e., high-temperature oxidation, micro-crack, and material smearing) and the subsurface defects (i.e., the white layer of 0.2–0.3 mm, material fracture, micro-crack, material peeling, and recrystallization). It is demonstrated that the thermo-mechanical-structural coupling effects influence significantly the profile grinding of turbine blade fir-tree root of the single crystal nickel-based superalloy (SX alloy). How to achieve the collaborative manufacturing of blade root structure shape and surface integrity poses great challenges to high-quality profile grinding.
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Funding
This work was supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20210866), Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 21KJB460021), and China Postdoctoral Science Foundation (Grant No. 2022M721623).
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All the authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Qing Miao. The first draft of the manuscript was written by Qing Miao, and all the authors commented on previous versions of the manuscript. All the authors read and approved the final manuscript.
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Miao, Q., Lu, M., Ding, W. et al. Creep-feed grinding of single crystal nickel-base turbine blade fir-tree roots: tool wear, grinding force, temperature, and surface integrity. Int J Adv Manuf Technol 126, 1453–1470 (2023). https://doi.org/10.1007/s00170-023-11188-5
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DOI: https://doi.org/10.1007/s00170-023-11188-5