Abstract
Titanium alloy, a special difficult-to-cut material, is hard to reach the occurrence of adiabatic shear fracture (ASF) in high-speed cutting. In this work, TA2 alloy was firstly taken as the workpiece in the high-speed cutting experiment under negative rake angle. The chip morphology transformation from serrated chip to isolated segment chip was obtained. The damage mechanism of ASF was investigated through scanning electron microscopic (SEM) observation on the fracture surface of isolated segment. Furthermore, based on saturation limit theory, the ASF prediction model was built up considering the conditions of stress, velocity, deformation, and constitutive relation. The critical cutting speed of ASF was predicted and verified experimentally. The influences of the cutting conditions and the thermomechanical properties on the occurrence of ASF were discussed. The results indicated that with the cutting speed increasing, the chip transformation from serrated chip to isolated segment chip was contributed to the periodic cycle of ASF. Comparing with other titanium alloys, TA2 alloy was more sensitive to ASF under negative rake angle and large feed.
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This work is supported by National Natural Science Foundation of China (Grant Nos. 51601155 and 51175063).
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Gu, L. Critical condition prediction of adiabatic shear fracture in high-speed cutting TA2 alloy. Int J Adv Manuf Technol 94, 2981–2991 (2018). https://doi.org/10.1007/s00170-017-1104-5
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DOI: https://doi.org/10.1007/s00170-017-1104-5