Conference
Foundry
Components of direct thermal method were studied separately. It was found that main cause for non dendrite pattern formation is presence of melt fl w. The role of thermal balance reduced to provision of conditions to motion of the melt under liquidus temperature. Incoming flow resulted in splitting of crystal interface.
Influencing of chrome and manganese in the wide range of their concentrations on wear proof of white cast-irons for making of the poured details working in the conditions of intensive abrasive and hydroabrasive wear is studied. It is set that at optimum correlation of these elements cast-irons have high hardness, wearproof and satisfactory casting properties, allowing to make the poured details of different mass, geometry and overall sizes. Influence of processes of микролегирования and modification is explored on operating properties of the recommended Cr-Mn cast-iron 290Х19Г4 and expedience of the use of these processes is set at production of the wearproof foundings taking into account concrete external environments.
On the basis of numerous studies using the methods of physical and simulation (computer) modeling, and also on the basis of the field experiments in the production of advanced and industrial castings prospective resource-saving technological areas of the method of in-mold inoculation of molten iron for castings with a given structure and propertiesis investigated in the work. The proposed areas can be recommended for implementation at enterprises of foundry industry for the manufacture of a wide range of high quality products.
The processes of change of the intermetalloids morphology and stoichiometry on the basis of iron in structure of secondary silumins under heat treatment influence are studied.
It is shown that netal of welded connections of AK9M2 alloy is not only not inferior to the base metal as regards durability, elongation and hardness but even exceeds its characteristies..
The study of the interaction of steel and cast iron with aluminum was performed by immersion, and isothermal holding. By optical and electron microscopy, the microstructure of the reaction zone was investigated. The partial enthalpy of dissolution of iron, steel and cast iron in liquid aluminum has been investigated by high-temperature calorimetry at 1773 K. X-ray analysis and microhardness measurements was used to study the phase composition of the reaction zone. The thermodynamic descriptions of the system Al–Fe and Al–C–Fe are performed within the CALPHAD-method.
Brief analysis of contemporary conceptions of metal melt cluster structure is presented and probable mechanisms of melt crystallization and ingot melting processes are considered on the base of these conceptions.
Influencing of chrome, aluminium, titan and RZM is explored in the wide range of their concentrations on physical and special properties of heat-resistant steels for making of the poured details, working in aggressive environments to 1250 °C. It is set that at optimum correlation of basic components became have high heat resistance, satisfactory casting and mechanical properties, allowing to make different mass, geometry and overall sizes. Heat conductivity and conductivity of chromium-aluminum steel is studied. The brands of steels are recommended for concrete external environments.
The peculiarities of the defective zones surfaces scanning, focused on optical visualization of abnormal fluctuations are considered.
The microstructure and microhardness of aluminum and silumin аК12 with iron content of 0 to 12 mas.% produced by sand casting and mol casting have been investigated. For the Al–Si–Fe and Al–Si–Fe–Mn systems the portions of the liquidus surfaces, which correspond to commercial silumin compositions, have been calculated using the updated thermodynamic model of the Al– Si–Fe system and COST–507 database. The area of primary crystallization of the iron-containing a and b phases is assessed for the commercial silumin. It has been proved that manganese promotes the formation of the iron-containing a-phase in the commercial silumin.
Computer-aided design of foundry production
The modern information infrastructure of a large or medium-sized enterprise is inconceivable without an effective system of the computer equipment and fictitious assets inventory. An example of creation of such system which is simple for implementation and has low cost of possession is considered in this article.
Metallurgy
Some technological parameters of the foundry and rolling complex at the area of the machine of the rolling steel slug continuous casting are presented.
The ways of improvement of the environment control system are considered. The measures allowing to exclude occurrence of undesirable events are developed under the analysis results.
The increase of service durability of the technological tool of piercing mill of the tube-rolling shop due to optimization of the geometrical sizes of the applied tool is considered. After changing of the geometrical sizes of the piercing mill technological tool, it was set as a purpose to redistribute the elementary efforts of deformation perceived by piercing mandrel and rollers of piercing mill along the length of their working surfaces. It was succeeded to increase service durability of the piercing mandrels not less than by 30% as a result of the carried-out work.
It is shown that the burned magnesia calcic flux of JSC “Complex “Magnesite” production is recommended for industrial use on all steel-smelting units of JSC “BMZ —management company BMK holding” on the basis of positive results on increase in firmness of fettling DSP-2.
Scales have been developed for determination of size of austenite grain of high carbon patented steel, austenite graine sizes have been researched.
Science of materials
The analysis of existing zinc coatings on steel details is carried out. The reached results on development of energyresourcesaving technologies of thermal-diffusion galvanization are reported.
The technology of coatings deposition with thickness up to 5 micrometers on the activated surface of steel shot is developed. The composition and arrangements of layers in covering of the steel shot intended for modification of steel are chosen.
Some peculiarities of using the method of thermodiffusion galvanization of improved and spring steels are considered in the article. Possibility of using the method of thermodiffusion galvanization as final operation of heat treatment in temperature range of 350-700 ˚C for the purpose of removal of internal tension after chilling is demonstrated. The complex energy saving technology of thermodiffusion galvanization of resilient elements is presented.
The results of modeling and their experimental-industrial test of alloy dissolution in the form of elementary chrome, cast and mechanically doped alloys «copper-chrome» system in copper melt at melting of chrome bronzes are given, the process of their production is optimized.
Young scientists
The issue of environmental problems of the modern foundry production is touched upon in this article. The types of environmentally dangerous substance and their influence on human organism are considered in it. The ways of solution of these problems are offered.
ISSN 2414-0406 (Online)