Some metallurgical aspects of chips formed in high speed machining of high strength low alloy steel

Adiabatic shear bands and white layers induced during high speed cutting of 30CrNi3MoV steel were investigated by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results show that some non-diffusional martensitic phase transformation and dynamic recrystallization might take place in the adiabatic shear bands and white layers within the chips.