APPLICATION OF ATOMIC FORCE MICROSCOPY FOR STAINLESS STEEL MICROSTRUCTURE STUDY AT VARIOUS KINDS OF HEAT TREATMENT
https://doi.org/10.17073/0368-0797-2017-2-133-139
Abstract
The paper presents the results of complex researches of 40Cr13 stainless steel. Using the methods of optical, scanning and atomicforce microscopy, micro- and nanostructures have been obtained, as well as has been given the comparison of the received images of structures and phase states of steel in three different states (after annealing, hardening and high-temperature tempering) with the results of electron and optical microscope investigations. The received optical images of a ferrite-pearlite structure of a valuable content of globular carbide with the composite of (Сr, Fe)23C6 , received after annealing, are given in comparison with the research results of scanning and atomic-force microscope investigations. It has been shown that the use of atomic-force and scanning electron microscopy in this work allows to make conclusions on steel microstructure, which coincide not only with the data of optical metallography but also exceed the latter in specification of structural characteristics. The usage of scanning electron microscopy allows establishing that large carbides are situated along the borders of ferrite grains. There are also some number of carbides inside the fine grains of ferrite; the sizes of inclusions have been defined. After hardening there are some structures which consist of macroacicular martencite. The usage of the images of atomic-force microscopy allows receiving the structure with the expressed acicular structure in comparison with scanning electron microscopy with the possibility to build visual 3D-images. The form of undissolved carbides is also globular. The sizes of martensitic lamella have been defined. The steel structure after high-temperature tempering (secondary sorbite) is formed as the result of the cracking of martensite on ferrite-carbide mixture with the formation of carbides of right round shape. The formed single and line carbides contain strong carbide-former – chromium (Сr, Fe)23C6 . It was confirmed by the results of spectrum analysis. Such structure differs from martensite in higher strength. For all the states the authors have given the results of mechanical tests by the scheme of axial extension, as well as have defined the HB hardness.
Supporting agencies: Program of Fundamental Researches of the Russian Academy of Science in 2015 – 2020 and RFBR (grant no. 16-08-00385-a)
About the Authors
G. V. Shlyakhova
Institute of Strength Physics and Materials Science SB RAS;
Seversk Technological Institute, National Research Nuclear University
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”
A. V. Bochkareva
Institute of Strength Physics and Materials Science SB RAS;
National Research Tomsk Polytechnic University
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”
S. A. Barannikova
Institute of Strength Physics and Materials Science SB RAS;
National Research Tomsk State University
Russian Federation
Dr. Sci. (Phys.-math.), Assist. Professor, Leading Researcher, Professor of the Chair “Mechanics of Strained Solids”
Russian Federation
Dr. Sci. (Phys.-math.), Assist. Professor, Leading Researcher, Professor of the Chair “Mechanics of Strained Solids”
L. B. Zuev
Institute of Strength Physics and Materials Science SB RAS;
National Research Tomsk State University
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Head of Laboratory of Physics of Strength, Professor of the Chair “Theory of Strength and Designing”
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Head of Laboratory of Physics of Strength, Professor of the Chair “Theory of Strength and Designing”
E. V. Martusevich
Siberian State Industrial Universisty
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Science named after V.M. Finke
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Science named after V.M. Finke
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Review
For citations:
Shlyakhova G.V., Bochkareva A.V., Barannikova S.A., Zuev L.B., Martusevich E.V. APPLICATION OF ATOMIC FORCE MICROSCOPY FOR STAINLESS STEEL MICROSTRUCTURE STUDY AT VARIOUS KINDS OF HEAT TREATMENT. Izvestiya. Ferrous Metallurgy. 2017;60(2):133-139. (In Russ.) https://doi.org/10.17073/0368-0797-2017-2-133-139
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