LAUSR

Abstract Inconel718 is nickel-based alloy and is also a multi-component complex alloy. There exist complex cutting deformation and serrated chip in machining Inconel718, which have been the focus concern of academia and business. In this paper, the failure behavior of shear band in the process of chip formation was studied by means of cutting experiment, numerical simulation and theoretical analysis. The stress triaxiality and Lode angle were used to reveal the relationship between different cutting conditions and fracture. The results show that the material in the upper region of the chip cross section is easy to be pulled off, and the ductile fracture occurred, and the stress triaxiality was positive. At the same time, it can be seen that a large number of shear dimples distributed in the bottom of the chip (near the tool-chip interface) and the shear fracture occurred, and the stress triaxiality was negative. When the value of stress triaxiality is between the above two ranges, the dimples and ductile fracture can be observed simultaneously in the chip cross section. Finally, combining with the law of the Lode angle and the fracture strain, the material fracture damage mechanism of the shear zone is revealed.