MEASUREMENT OF RESIDUAL-STRESSES IN HEAT-TREATED STEELS

The application of a new apparatus for the mechanical analysis of resi dual stress is described; this enables the determination of the distri bution of residual stresses of the first kind over the cross-section o f bar-shaped specimens. Results of residual stress analysis on heat-tr eated specimens of heat treatable steel 42CrMo4 (1.7225) are presented and compared with those from the X-ray diffraction method and the inc remental hole drilling method. The residual stresses measured by the X -ray diffraction method at the surface agree well with the results of the layer removal method, whereas in this case incremental hole drilli ng led to erroneous results.