Transmission Kikuchi Diffraction study of texture and orientation development in nanostructured hard turning layers

A texture and orientation study was performed on the hard turning layers by utilizing newly developed Transmission Kikuchi Diffraction technique complemented by glancing angle X-ray diffraction and high resolution transmission electron microscopy (HRTEM). Results indicate that the hard turning process transforms the typical martensite lath/plate structure into equiaxed grains with low angle (<10°) boundaries. At lower cutting speeds, the texture was shear dominated while at high cutting speeds, the thermal transformation produced strong recrystallization texture. The results demonstrate that by simply manipulating the process conditions, hard turning could be utilized to tailor the surface nanostructures for enhanced service life.