A thermal-mechanical orthogonal cutting finite element model(FEM) was established by Abaqus/Explicit to explore the saw-tooth chip formation process and mechanism in hard turning AISI 52100 steel.The observation of stress distribution,temperature distribution and mesh distortions along cutting time in high and low speed machining processes contributes to demonstrate the adiabatic shear mechanism of saw-tooth chip formation process of AISI 52100 bearing steel.Firstly,a short horizontal adiabatic shear band i...