Abstract
The study was performed on alloys with a carbon content of 0,37-0,57 % (wt.), silicon 0,23-0,29 % (wt.), manganese 0,7-0,86 % (wt.), the rest– iron. To determine the phase composition of alloys used microstructural, microanalysis and X-ray analysis. In addition, the physical characteristics of the alloys studied in this paper were determined, such as alloy chemical dependence of extension and contraction ratio, impact toughness and hardness. The results obtained in this paper showed that the iron-based alloy with the content of carbon of 0.57 % (wt.), silicon of 0.28 % (wt.) and manganese of 0.86 % (wt.)) had the superior microstructure and physical properties. It was determined that after a number of crystallization and phase transformation the alloy phase structure includes two phases: a-iron and cement magnesium doping Fe2.7Mn0,3C..
 For the first time using the method quasichemistry received an expression of the free energy of a γ-iron alloyed with silicon and magnesium, and determined the solubility limit of carbon, manganese and silicon. The maximum content in γ-iron can reach: carbon 6,8 % (at.), manganese – 67,5 % (at.), silicon – 2,3 % (at.).
Highlights
There is a particular interest in steels that have high strength and ductility
For the formation of these steels, there are three approaches - the two-phase steel (DP), steel with martensitic transformation conditioned plasticity (TRIP) and high manganese austenitic steel with double industrial plasticity (TWIP).All these types of steel are based on an ironcarbon-manganese system with the addition of ferrite formers such as flint and aluminum, whose content is much higher than other steels
Type TWIP steel with the composition of Fe-C-Si-Al-Mn often or without aluminum or with a high content of manganese up to 25 % [1,2,3].Fe-Mn-Si-C alloys containing up to 0.6 % of carbon are used as structural steels for the manufacture of various parts, mechanisms and structures in mechanical engineering and construction
Summary
There is a particular interest in steels that have high strength and ductility. For the formation of these steels, there are three approaches - the two-phase steel (DP), steel with martensitic transformation conditioned plasticity (TRIP) and high manganese austenitic steel with double industrial plasticity (TWIP).All these types of steel are based on an ironcarbon-manganese system with the addition of ferrite formers such as flint and aluminum, whose content is much higher than other steels. Type TWIP steel with the composition of Fe-C-Si-Al-Mn often or without aluminum or with a high content of manganese up to 25 % (wt.) [1,2,3].Fe-Mn-Si-C alloys containing up to 0.6 % (wt) of carbon are used as structural steels for the manufacture of various parts, mechanisms and structures in mechanical engineering and construction. In the alloy of the Mn-C system, the carbon solubility is 2 - 3 % (at.), and in the Fe-C system – 2.14 % (wt.) in γ-Fe [8,9]
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