Recovery of strength properties of pump rods by means of functional gradient materials generating

Abstract

The article considers the issues of increasing the environmental safety of oil producing areas at the expense of application pump rods put out of operation. It is demonstrated that it is reasonable to consider the recovered pump rod as a functional gradient material with specified strength properties. Factors, influencing fatigue strength of material under conditions of interaction with corrosive medium, are analyzed. Corrosive fatigue strength criterion is formulated considering residual axial stresses. It is demonstrated that the most suitable process to create the required gradient material is tensioning with further plastic rod torsion.