Serpets'kyj B. Investigation of Residual Stresses and Structure of Surface in Metals Materines in Condition of Alternating Loads

The aim of work was an improvement of physical methods and investigation of residual stresses in highly loaded gas-turbine parts. The mechanism of fatigue was studied too. Objects of study were real parts (blades, slots and disks). Parts were manufactured of titanium-based alloys and of heat-resistant steels. X-ray diffractometric method was used as well as study of the resistance against fatigue. Resistometric and work function measurements were applied. The new scheme of X-ray survey was proposed and new program of data calculations was worked out. The accuracy was increased by one order. The residual compressed stresses of minus 370 to minus 750 MPa were ensured. It had improved the reliability and durability of parts. It was proved that the method of work function measurements had forecast possibilities as for place and time the cracks generation. An quantitative physical model of fatigue was worked out. The results of calculations agree with experiments.