Mechanics of Deformable Solids
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-1-3

Popov A., Zhilin S., Komarov O.

ARTYOM POPOV, Junior Researcher, ORCID: http://orcid.org/0000-0001-6588-9937, ScopusID: 57193351972, e-mail: popov.av@protonmail.com
SERGEY ZHILIN, Leading Researcher, Candidate of Engineering Sciences, Associate Professor, ScopusID: 56047191300, e-mail: zhilin@imim.ru
OLEG KOMAROV, Leading Researcher, Candidate of Engineering Sciences, Associate Professor, ScopusID: 56432713000, e-mail: olegnikolaevitsch@rambler.ru
Institute of Machinery and Metallurgy, FEB RAS
1 Metallurgov St., Komsomolsk-na-Amure, Russia, 681005

Influence of heat treatment modes on the structure and properties 
of cast blanks obtained by aluminothermy method

Abstract: The influence of sequential operations of heat treatment (under annealing, heat hardening, low-temperature tempering) on formation of structural components, which determine the tensile strength, extension strain and fracture mode of iron-carbon alloy obtained by aluminothermy method is investigated in this work. High-carbon (with a carbon content of 1.32–1.93%) experimental samples of metals obtained from thermite mixtures with a content of 0.2 to 5.6% of sealant with carbon crucibles and molds were studied. It was defined that under annealing makes it possible to increase the tensile strength (from 33 to 84%) and relative elongation of samples (from 108 to 893%) under tension, due to reduction of internal stresses, when structural components transfer to granular perlite. Quenching and low annealing operations can increase the tensile strength (from 25 to 64%), while decreasing their relative elongation (from 11 to 57%). The structure of the heat-treated samples can be described as martensite and carbide phases. It was found that in a sample obtained from a termite composition containing 4.3% of fillers, the elongation practically does not change depending on the applied heat treatment operations, and tensile strength increases significantly only after quenching and low tempering. Generally, sequential heat treatment operations enabled reduction of internal stresses of cast billets, correct their structure, significantly increase the tensile strength of the samples under study, while changing the relative elongation.
As a result of aluminothermy application, high mechanical properties of materials and critical products, including cutting tools, springs and springs, were achieved.
Perspective of further research: effects of temperatures different from those under traditional heat treatment conditions on hardness, wear resistance, impact strength, strength and elongation.
Keywords: reduction of casting stresses, increase in strength, heat treatment of aluminothermic steels, incomplete annealing, physical and mechanical properties, aluminothermy, casting.

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