Technological Support for the Uniformity of Plastic Deformation during Thermal-Force Treatment

—The problems of ensuring the uniformity of axial deformation distribution during the tension of cylindrical workpieces using a new technique for estimating deformation localization are considered. This estimation is necessary on designing and carrying out thermal-force treatment at the preparation stage of the technological process of manufacturing low-rigid long blanks. It consists in simultaneous heating and deformation, which ensures the formation of linear workpieces with leveling and reducing the level of residual technological stresses. For long workpieces, the strain distribution in the axial direction along individual regions along the shaft length is characterized by instability, which is associated with the initial heterogeneity of the material properties and nonuniform heating. A method for estimating deformation localization, which provides a comprehensive estimation of the uniformity of tension along the length, is considered. The influence of the autowave character of plastic flow on deformation localization during high-temperature tension of 12Kh18N10T alloy workpieces is proved.