Microstructual investigation of Co-Cr clad applied on railway wheels

Övrigt konferensbidrag, 2004

Laser cladding is applied to locally improve the functional surface properties of parts such as wear resistance (increased surface hardness) and corrosion resistance. In the present study the EBSD technique was used to investigate microstructure and textur of a Co-Cr-clad applied on railway wheels. The investigations showed that the clad consists of elongated grains that grow perpendicular to the clad surface with a [001] fibre texture. The investigations also revealed that no dominant orientation relationship (angle/axis pair) occurs between the alpha-Co grains of the clad. The relative orientation between the alpha-Co (high temperature) and gamma-Co (low temperature) phase is determined by comparing the pole figures of the respective phases. Different reasons of aprupt changes in the colors of the orientation maps are also discussed.