Chair of Materials Science and Process Metallurgy, National Research Tomsk Polytechnic University, Tomsk, Russia:

N. V. Martyushev, Assistant Professor, e-mail: martjushev@tpu.ru
Yu. N. Petrenko, Assistant

Chair of Physical Education, Seversk Technological University of National Research Nuclear University “MEPhI”, Seversk, Russia:

S. A. Petrenko, Head of a Chair

Increase strength characteristics of products with high antifrictional properties, for example, bearings of sliding, consolidations of pump installations, piston rings of compressors applied in the chemical industry was the work purpose. In this research it was examined the influence of conditions of crystallisation binary leaded bronze on parametres of a received microstructure. Cooling speed of casting detail changed at crystallization at the heating expense of a graphite casting mold. Following the results of the metallographical analysis quantitative laws of investigated bronze cooling speed influence on parameters dendritic cells, grain size have been presented. The quantitative estimation of parameters of a casting detail microstructure was made by means of the images computer processing original technique developed by authors. The data about formation of lead inclusions between dendrites of a copper matrix are published as well. The basic results and laws of work are resulted for binary lead bronzes. At the same time, in work identity of crystallization mechanisms, both for binary lead bronzes, and for industrial marks of bronze (with many components such as tin, nickel, zinc). It is shown that high rates of cooling of an order 100–150 ^oС/c lead to dendritic structures formation containing only axes of the first and second order. Lead inclusions will have thus the wrong extended form with a fragmentary and rough interphase surface. Decrease of cooling rate at the moment of crystallisation to the values less 15 ^oC/c leads to appearance and growth of axes of 3rd order at dendrites matrix. Lead inclusions in this case settle down between copper matrix axes of the second and third order. The form of such inclusions will be close to spherical with an equal interphase surface.

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