Mathematical Model of the Accelerated Cooling of Metal in Thick-Plate Hot Rolling

Metallurgist - The paper describes the issues in predicting the consumer properties of thick-plate pipe products manufactured at the hot rolling mill 5000 of the Magnitogorsk Iron and Steel Works....     

Transformation of austenite in Fe-Cu alloys. III: Copper precipitation during cooling and holding of steels alloyed with copper

Strengthening of Fe-Cu alloys during isothermal aging has been considered. The size of particles that provides a maximum strength has been found. A theory of particle growth under the conditions of continuous cooling has been developed. The cooling rate that provides the maximum contribution from age hardening has been calculated.     

Certification of Mill 5000 (PJSC “MMK”) Rolled Flat Products by Non-Destructive Control Methods

Metallurgist - The paper describes the development stages of non-destructive magnetic control method for testing rolled metal products at PJSC “MMK”. The main conditions for using...     

Structural and Textural States of Steel 06G2MB Strips After Controlled Thermomechanical Treatment

Metal Science and Heat Treatment - Orientation microscopy (EBSD) is used to study structural and textural states through the thickness of pipe steel strips after a controlled thermomechanical...     

Possibilities of strengthening of Fe-Cu alloys upon isothermal aging

The kinetic theory of diffusion phase transformations is used to calculate the time it takes for the ɛ phase to form in Fe-Cu alloys at various temperatures. The fine structure and hardness of alloys containing from 0.6 to 5.5 at % Cu and aged in the martensite state are studied. The calculated and experimental data are in good agreement. The cooling rate of copper-bearing alloys that provides the maximum hardness upon the precipitation of ɛ-phase particles of a given size is estimated.     

On the mechanism of nucleation of copper precipitates upon aging of Fe-Cu alloys

Structure of the Fe-5.5% Cu alloy has been studied after aging at 500°C to show that the lattice of copper precipitates changes with increasing time of holding at a temperature from bcc to 9R to fcc. The free energy of the solid solutions and the phase-separation diagrams of the bcc and fcc phases of copper have been calculated. Barriers for the nucleation of copper particles with the bcc and fcc lattices have been evaluated. Factors that favor the appearance of intermediate structural forms of copper, which precede the formation of the stable fcc phase, are discussed.     

Origin of abnormal formation of pearlite in medium-carbon steel under nonequilibrium conditions of heating

The structure and kinetics of the formation of austenite in medium-carbon steel during shortterm heating above the temperature Ac₁ followed by accelerated cooling are analyzed. It has been shown that the abnormal formation of pearlite in steel results from the concentrational and structural inhomogeneity of austenite, as well as the presence of carbide particles in ferrite areas.     

Recrystallization of medium-carbon steel under nonequilibrium conditions of short-term heating to a temperature above Ac1

The phase recrystallization of medium-carbon steel with the initial structure of lamellar pearlite in the process of short-term heating to different temperatures above Ac₁ and subsequent cooling has been studied. The structure of steel formed under the nonequilibrium conditions corresponding to the decomposition of supercooled austenite has been described. It has been shown that the changes in the structure and phase composition that arise during this treatment have a noticeable effect on the characteristics of the deformation behavior of the material determined based on the results of dynamic indentation.