Khoma M. The theoretical basis of the initial stage of corrosion fatigue fracture of corrosion resistant stainless steels and alloys and development of the methods prediction of their endurance limit

The thesis is devoted to the study of electrochemical regularities of the corrosion fatigue cracks initiation. The promising scientific direction - the electrochemistry of the initial stage of corrosion fatigue fracture of corrosion-resistant steels and alloys is developed. Different grades of stainless steels were investigated and it was established that their tendency to corrosion fatigue is determined by the intensity of processes "microdeformation - electrochemical activation - local dissolution - repassivation". The electrochemical criterion of stainless steels corrosion fatigue fracture is proposed. The possibility of existance of the corrosion fatigue physical limit is substantiated. The methods of the accelerated assessment of its values are developed. The character of localization of corrosion-fatigue damage and efficiency of deformation galvanic couples operation is studied. The influence of cyclic deformation of selective dissolution of steels and alloys is investigated. It was established that cyclic deformation promotes accumulation of chromium and nickel on the surface of stainless steels and alloys.