On the matter of dislocation-diffusion genesis of lamellar pearlite in high-carbon coil-rod mill products

Authors

  • E. V. Parusov Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine, Ukraine
  • S. I. Gubenko Department of material science, National metallurgical academy of Ukraine, Gagarina avenue, 4, Dnipropetrovsk, Ukraine, Ukraine
  • A. B. Sychkov Department of foundry and materials,Nosov Magnitogorsk State Technical University, Lenin Avenue, 38, Magnitogorsk, Russia, Russian Federation
  • I. N. Chuiko Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine, Academic area Starodubova, 1, Dnipropetrovsk, Ukraine, Ukraine
  • L. V. Sahura Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine, Academic area Starodubova, 1, Dnipropetrovsk, Ukraine, Ukraine

Keywords:

pearlitic transformation, dislocation-diffusion model, cementite, ferrite

Abstract

Purpose. It  is  of  scientific  interest  to  carry  out  the  research  of  particulars  of  pearlite  transformation  process  in  coil-rod  mill products  manufactured  from  steels  of  85  and  85P  grades  in  order  to  determine  the  influence  of  dislocation  transformations  in austenite to the forming of pearlite structure with lamellar  morphology.  The particular features of the dislocation transformations need to be analyzed. Moreover, it is necessary to reveal the capabilities to implement the controlled pearlite transformation in order to regulate the volumes of strength and plasticity of rolled metal goods from the rolling heat. The purpose of the study is to determine the particular influence of dislocation structure of hot-deformed austenite to the process of pearlite transforming in the steel of 85 and 85P grades establishing the dislocation-diffusion genesis of lamellar pearlite. Methodology. Industrial batches of hot-formed coil-rod mill products made of steel of 85 and 85P grades were the test material for the study. Research methods: metallography (optical, stereo-scanning  microscopy)  and  X-ray  crystal  analysis. Obtained  Results. It  was  determined  that  polygonizational  dislocation transformations that occur in the sub-structure of hot-formed austenite as the result of thermoplastic deformation prior to the pearlite transformation, as well as interrelation of the dislocations with the interstitial atoms, affect its mechanism and ensure the capabilities of controlling of the structure forming processes in coil-rod rolled metal of large diameters  made of steels of 85 and 85P grades. Originality. The particular features of pearlite transformation in steels of 85 and 85P grades which establish the dislocation-diffusion genesis of the lamellar morphology of pearlite. Practical value. Using of the outcomes obtained in the course of study will ensure the development of brand new modes of high-temperature thermo-mechanical treatment of high-carbon coil-rod mill products of wide grade assortment, and to fulfill its power- and resource-saving processing during the metal goods process stage.

Author Biographies

E. V. Parusov, Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine

Cand. of Tech Sci., Senior Researcher

S. I. Gubenko, Department of material science, National metallurgical academy of Ukraine, Gagarina avenue, 4, Dnipropetrovsk, Ukraine

Doct. of Tech Sci., Professor

A. B. Sychkov, Department of foundry and materials,Nosov Magnitogorsk State Technical University, Lenin Avenue, 38, Magnitogorsk, Russia

Doct. of Tech Sci., Assistant Professor

I. N. Chuiko, Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine, Academic area Starodubova, 1, Dnipropetrovsk, Ukraine

Cand. of Tech Sci.

L. V. Sahura, Department metal heat treatment for mechanical engineering, Nekrasov Institute of Ferrous Metallurgy of National academy of sciences of Ukraine, Academic area Starodubova, 1, Dnipropetrovsk, Ukraine

Cand. of Tech Sci

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Published

2016-03-22

Issue

Section

Proceedings in memory of Starodubov