Research on High Speed Machining of TC17 Titanium Alloy Under Extreme Environments
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In this paper, high-speed cutting experiment has been carried out on TC17 titanium alloy after secondary ageing treatment in extreme environments, − 60 and 300 °C respectively. Hyperfocal 3D microscopic system has been adopted to analyze the cutting surface morphology; TEM microstructure analysis has been carried out on TC17 titanium alloy before and after cutting, and the cutting tool’s frictional wear and surface quality have been studied after cutting TC17 titanium alloy in extreme environments. The results show that: the cutting tool mainly displays abrasive wear at − 60 °C with chipping problems, while at 300 °C the cutting tool mainly displays oxidative wear and adhesive wear; at − 60 °C, the hardness and brittleness of TC17 titanium alloy increases after subzero treatment, and the cutting produces poor surface quality; at 300 °C, both the hardness and brittleness of the alloy decreases after regressive heat treatment, but the tenacity increases. During the cutting, oxide film is generated on a constant basis, thus the surface quality gets significantly enhanced, and the cutter life lengthened; at − 60 °C, the dispersed phase of the material gets finer, while at 300 °C, the dispersed phase disappears considerably, or rather, regression takes place.
KeywordsExtreme environment Cutting-tool wear Surface quality Dispersed phase Regression
The work was supported by the National Natural Science Foundation of China (No. 51705270), the National Natural Science Foundation of China (No. 51575289) and the Natural Science Foundation of Shandong Province (No. ZR2016EEP03) and Science and Technology Project of Higher Education of Shandong Province (No. J17KA031).
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