Microstructure formation regularity in complexalloyed steel 25hgnma

Authors

  • I. V. Oliinyk Department of metal heat treatment, National Metallurgical Academy of Ukraine, Gagarin ave., 4, Dnipropetrovsk, 49600, Ukraine, Ukraine
  • М. F. Evsyukov Department of metal heat treatment for mechanical engineering, Institute of Steel and Iron NAS Ukraine, sq. academician Starodubov, 1, Dnipropetrovsk, 49050, Ukraine, Ukraine
  • V. S. Chmeleva Department of metal heat treatment, National Metallurgical Academy of Ukraine, Gagarin ave., 4, Dnipropetrovsk, 49600, Ukraine, Ukraine
  • ZH. A. Dement''eva Department of metal heat treatment for mechanical engineering, Institute of Steel and Iron NAS Ukraine, sq. academician Starodubov, 1, Dnipropetrovsk, 49050, Ukraine, Ukraine

Keywords:

heat treatment, alloyed steel, phase transformations

Abstract

Purpose. Investigation  of  the  microstructure  formation  in  complex-alloyed  steel  25HGNMA,  containing  0.15  % molybdenum,  during  decomposition  of  austenite  in  the  wire  rod  in  the  range  of  cooling  rates  in  different  environments  after austenitizing with thermokinetic diagrams construction. Methodology. The research was conducted on the wire rod diameter of 18,5 mm, manufactured with TC 00187895 by JSC "Oskol Electric Steel Works" (Russian Federation). Kinetics of austenite transformation after heating in a separate large range of cooling rates was studied with a dilatometer AD-80 and MD-83, designed by ISI. Were produced hot-rod samples with a diameters from 3 to 4 mm. Heating the samples in the dilatometer was performed to 900 °C, with the following staying during 5 min. Then samples were cooled under the program in furnaces with different thermal inertia, with air, under the fan, and with oil. Findings. Research efforts revealed that low-carbon alloy steel complex 25HGNMA, produced with TC 00187895 by JSC "Oskol Electric Steel Works" with a content of molybdenum equal to the lower limit of 0,15 %, is a pearlitic steel. For thermalhardening to obtain a wire rod bainite structure should be cooled after the rolling or after austenitizing at speeds higher than 0,82 °C/sec. Originality. Studied the kinetics of phase transformations in the complex of continuous low-carbon alloy steel 25HGM, widely used in domestic industrial practice in the machine-building enterprises of Ukraine. Practical value. This research may be claimed for the machine-building enterprises of Ukraine, in particular in the manufacture of welded round link chains for mining equipment.

Author Biographies

I. V. Oliinyk, Department of metal heat treatment, National Metallurgical Academy of Ukraine, Gagarin ave., 4, Dnipropetrovsk, 49600, Ukraine

graduate student

М. F. Evsyukov, Department of metal heat treatment for mechanical engineering, Institute of Steel and Iron NAS Ukraine, sq. academician Starodubov, 1, Dnipropetrovsk, 49050, Ukraine

Candidate of Engineering Sciences, Senior Research Officer

V. S. Chmeleva, Department of metal heat treatment, National Metallurgical Academy of Ukraine, Gagarin ave., 4, Dnipropetrovsk, 49600, Ukraine

Candidate of Engineering Sciences, Associate Professor

ZH. A. Dement''eva, Department of metal heat treatment for mechanical engineering, Institute of Steel and Iron NAS Ukraine, sq. academician Starodubov, 1, Dnipropetrovsk, 49050, Ukraine

Research Officer.

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Published

2016-03-22

Issue

Section

Proceedings in memory of Starodubov