Residual Stresses and Residual Stress Distributions in TiCN and TiN coated steels
X-ray diffraction is an important and well known tool for the non-destructive analysis of residual stresses especially in thin coatings. In this paper results are presented using X-ray diffraction for the analysis of residual stress states in CVD and PVD hard coatings. The problem of the unknown X-Ray Elastic Constants was solved by measuring these constants for CVD—TiCN and PVD-TiN coatings on steel 52100 for different coating temperatures and different X-ray radiations (Chromium Ka and Copper Ka). Using the measured constants residual stress states at the surface as well as depth profiles of residual stresses in the coatings and the substrate were determined. X-Ray Radiations, having a remarkable different penetration depth, gave a possibility to obtain residual stress values of the real surface and integrated values over the whole coating depth.