Application of a high temperature chamber for X-ray stress analysis

The adhesion strength as well as the crack resistance of hard CVD coatings on cutting tools are widely influenced by the appertaining residual stress states. They are generated during cooling down from coating temperature, or during a subsequent heat treatment. To enhance the knowledge of the residual stress development in such CVD coatings on steels, X-ray residual stress analyses were performed during the cooling process. Therefore, a high temperature chamber for a Ψ-diffractometer was developed and manufactured. It allows X-ray residual stress analyses at temperatures of up to at least 1000°C using a measuring range of 2θ ≥ 94° at |Ψ| ≤ 60°.