Institute of Material Science and Metallurgy of Ural Federal University named after the first president of Russia B. N. Yeltsin, Ekaterinburg, Russia

Yu. N. Loginov, Professor, e-mail: unl@mtf.ustu.ru
S. L. Demakov, Professor
A. G. Illarionov, Assistant Professor
M. A. Ivanova, Post-Graduate Student

Ural Mining and Metallurgical Company, «Revda Non-ferrous Metals Processing Plant», Revda, Sverdlovsk Oblast, Russia
M. S. Shalaeva, Processing Engineer

The object of research is clarification of sufficiency of industrial method parameters of pipes annealing from the heat engineering copper of M1r (М1р) grade. At the same time, there were solved the tasks of determination of physical and mechanical properties of copper in the following conditions:
— during the intensive plastic deformation;
— after vacuum recrystallization annealing.
Methods of textural analysis are applied, along with metallographic methods of research, including optical microscopy and electronic microscopy with usage of diffraction of back scattered electrons. The deformed condition was reached by hot oxide free extrusion and subsequent multipass dragging with accumulation of cold deformation at total percent reduction of 99,4%. Carrying out of industrial annealing in vacuum at the temperature of 500 ^оС during 5,5 leads to the recrystallized condition of heat engineering copper at achievement of average size of grain of 9,9 μm. There was carried out the analysis of condition of special borders. Match of lattices' borders at various levels was reached for the deformed condition. At the same time, the share of special borders of the 3 type (which are characteristic for annealing doubles) is the highest for annealed condition and is close to 100%. There is defined that the Schmid frequency diagram in the deformed condition has two maximums: the first is in the field of 0.33 value; the second is near 0.45 value, which is explained by the textural components <111> and <100>. After the process of annealing, the peak of frequency distribution of a Schmid factor moves towards great values, which corresponds about reduction of a share of grains in structure with the primary direction of <111> type along the pipe axis. Manufacturing of products from the heat engineering appointment copper is the results application area. There is made a conclusion about an acceptability of industrial annealing conditions in relation to this material and its purity degree.

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