Improvement of quality indicators and elimination of chemical microinhomogenity of the rolled products made of mn-containing steel by the new thermal treatment modes
Journal Title: Metallurgical and Mining Industry - Year 2017, Vol 9, Issue 6
Abstract
The tensile properties of normalized low alloy E36 steel after heat-treatment mode, which includes isothermal holding at the subcritical temperatures and subsequent normalization, were investigated. A solution of actual scientific and technical tasks such as the improvement of operational performance, elimination of the anisotropy of the mechanical and physical and chemical properties by optimizing the chemical composition and a homogeneous spatial distribution in the microstructure of the main alloying elements is given in the paper. Using the methods of the deep data analysis researching, the effect of production parameters (chemical composition and thickness of rolled metal) on the key indicators of the mechanical properties: ultimate strength, yield strength, percent elongation and impact resistance was investigated. Herein, the influence of thermal treatment on the chemical distribution of elements, microstructure, hardness and mechanical properties of the welded manganese steels were examined. It is established that in the process of isothermal holding in a two-phase area, there are intensive processes of grain-boundary diffusion; they lead to redistribution of the alloying elements. It is shown that there is increase of hardness and high plasticity conservation as a result of the preliminary heat-treatment. The results were obtained in accordance with the metallographic data about fine sized grain boundary pearlite areas formation during the isothermal holding.
Authors and Affiliations
I. F. Tkachenko, M. A. Uniyat
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