STUDY OF THE STRUCTURE OF BIMETAL CONSTRUCTION CARBON STEEL – STAINLESS STEEL
https://doi.org/10.17073/0368-0797-2018-4-300-305
Abstract
The results of comprehensive study of bimetallic samples obtained as a result of pouring St3 structural steel between plates of Kh18N9T stainless steel placed in a mold followed by hot rolling of the obtained three-layer plate are presented. Analysis of the interface boundary has confirmed its continuity and high quality. Investigation of microstructure of the interface area by means of optical, atomic-force, and electron metallography has shown that three structural components occur in the direction from pearlitic to austenitic steel: weakened section of ferrite layer; hardened section of ferrite layer and dark-etched interlayer on the austenitic steel side. Using atomic-force microscopy, contact method in “constant force” mode in particular, and optical metallography, it was established that from St3 steel side as it approaches interface, decarburized layer with purely ferrite structure is formed instead of typical low-carbon steel structure consisting of ferrite matrix with pearlite colonies, and on Kh18N9 steel side a carburized layer is formed. In addition, an intermediate layer (carbide) with a depth of up to 50 μm was detected at the boundary. The nature of micro-hardness change in the area of St3 carbon steel and cladding layer of Kh18N9T stainless steel interface shows significant increase in materials strength. Microelement analysis of the area of St3 – Kh18N9T interface made it possible to establish nature of change in concentration of alloying elements as they approach the interface boundary. Presence of chromium in St3 steel and increase in carbon concentration in stainless steel confirmed the assumption of two mutually directed diffusion flows generation, namely, reciprocal diffusion of carbon from St3 steel and alloying elements of Kh18N9T steel. Resulting carbides explain increased hardness of both steels near the bound zone.
Supporting agencies: The work is carried out within the framework of the Program of Fundamental Scientific Research of the Russian State Academies of Sciences for 2013 – 2020 and is partially supported by RFBR grant No. 17-08-00751-a.
About the Authors
G. V. Shlyakhova
Institute of Strength Physics and Materials Science SB RAS, Tomsk;
Seversk Technological Institute, National Research Nuclear University,
Seversk, Tomsk Region
Russian Federation
Cand. Sci. (Eng.), Research Associate, Assist. Professor of the Chair “Machines and Devices of Chemical and Atomic Productions”
Russian Federation
Cand. Sci. (Eng.), Research Associate, Assist. Professor of the Chair “Machines and Devices of Chemical and Atomic Productions”
S. A. Barannikova
Institute of Strength Physics and Materials Science SB RAS, Tomsk;
National Research Tomsk State University, Tomsk;
Tomsk State University of Architecture and Building, Tomsk
Russian Federation
Dr. Sci. (Eng.), Leading Researcher, Professor of the Chair “Mechanics of Strained Solids and Construction Mechanics”
Russian Federation
Dr. Sci. (Eng.), Leading Researcher, Professor of the Chair “Mechanics of Strained Solids and Construction Mechanics”
Yu. V. Li
Institute of Strength Physics and Materials Science SB RAS, Tomsk
Russian Federation
Junior Researcher
Russian Federation
Junior Researcher
A. V. Bochkareva
Institute of Strength Physics and Materials Science SB RAS, Tomsk;
National Research Tomsk Polytechnic University, Tomsk
Russian Federation
Cand. Sci. (Eng.), Junior Researcher, Assist. Professor of the Chair “Theoretical and Applied Mechanics”
Russian Federation
Cand. Sci. (Eng.), Junior Researcher, Assist. Professor of the Chair “Theoretical and Applied Mechanics”
L. B. Zuev
Institute of Strength Physics and Materials Science SB RAS, Tomsk;
National Research Tomsk State University, Tomsk
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Head of the Laboratory of Physics of Strength, Professor of the Chair “Theory of Strength and Designing”
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Head of the Laboratory of Physics of Strength, Professor of the Chair “Theory of Strength and Designing”
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For citations:
Shlyakhova G.V., Barannikova S.A., Li Yu.V., Bochkareva A.V., Zuev L.B. STUDY OF THE STRUCTURE OF BIMETAL CONSTRUCTION CARBON STEEL – STAINLESS STEEL. Izvestiya. Ferrous Metallurgy. 2018;61(4):300-305. (In Russ.) https://doi.org/10.17073/0368-0797-2018-4-300-305
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