Abstract
The state of the problem of stabilizing the structure, improving the quality and properties of structural alloys is studied. To solve the problem, it is proposed to modify melts of low–alloyed alloys with nanodispersed compositions obtained by plasma–chemical synthesis. Process technological parameters are developed. Nanopowders of carbide and carbonitride class SiC and Ti (C, N) with a size of 50 ... 100 nm are obtained. The crystallographic parameters of the nanocompositions and the specific surface are determined, and the dependency curves are plotted. The macro– and microstructure of structural steels and alloys was studied before and after the modification. A significant (in 2 ... 3.5 times) grain refinement and stabilization of the alloy structure as a result of nanopowder modification of titanium carbonitride have been achieved. Thermodynamic calculations of the dimensions of crystalline seeds during the crystallization of steels and alloys are carried out. A complex criterial estimation of the efficiency of nanodispersed compositions in a steel melt is proposed. The features of crystallization and structure formation of modified structural steels are studied. The obtained results are of theoretical and practical importance for production of critical parts from structural steels and high–quality alloys.
Highlights
The field of study of nanodispersed materials is the most rapidly developing in modern materials science, since the production of finely dispersed structures contributes to a fundamental (2017), «EUREKA: Physics and Engineering» Number 6 improvement in the complex properties of structural steels and alloys
All this is reflected in the mechanisms of ordering of nanomaterials associated with the patterns of changes in their structure and physic-mechanical properties [2,3,4,5,6]
Materials and Methods The materials of the study are structural low-alloy steels 09Г2С and 09Г2ФБ, these grades of steel are most widely used for the manufacture of parts and building structures, pipe products, as well as aluminum alloys Al-Mg for welded structures
Summary
The field of study of nanodispersed materials is the most rapidly developing in modern materials science, since the production of finely dispersed structures contributes to a fundamental (2017), «EUREKA: Physics and Engineering» Number 6 improvement in the complex properties of structural steels and alloys. The development of nanotechnology is based on the use of physical-mechanical and surface properties of powder materials [1]. The main reason for the appearance of special surface properties of nanomaterials and nanosystems is the high specific surface area and energy activity of nanoparticles. One of the main reasons is the role of size effects, which manifests itself both in individual nanoparticles and in nanosystems [3]. All this is reflected in the mechanisms of ordering of nanomaterials associated with the patterns of changes in their structure and physic-mechanical properties [2,3,4,5,6].
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