INVESTIGATION OF THE STRESSED STATE OF CAST METAL AT CYCLED HEATING
https://doi.org/10.17073/0368-0797-2016-11-781-786
Abstract
Foundry practice is widely used in iron and steel industry for manufacturing of numerous steel parts that undergo thermal cycling at exploitation. In order to increase their service lives the problem of cracks formation is to be solved. Operation conditions of a steel ingot at cycled impact of high temperatures were analyzed on example of a head part of the gripping device of continuous casting machines. The head part of a gripping device is exposed to intense and not-uniform heating it leading to formation of substantial stresses inside. Due to periodic heating and cooling cycles in the surface layer of the most heated part (the locker) deformation stresses-strains (of elongationcompression type) spring up, resulting in formation of surface cracks after several dozens of cycles. The stressed state of the head part of the gripping device at heating and cooling periods was investigated. It was found that thermal strain in cast metal, resulting from the impact of high temperatures was the reason of cracks formation. It decreases the operational durability of steel cast parts. With due regard to the character and direction of formation of cracks it was suggested to create a layer on the surface of locker’s tooth, by means of strengthening or renewal surface deposition, which can withstand deformation and is devoid of strain concentrators. It seems to be the most promising way of repairing of parts, manufactured by the process of casting.
About the Authors
A. V. Loza
Azov State Technical University
Ukraine
Ukraine
Senior Lecturer of the Chair «Theoretical and Applied Mechanics»
Mariupol, Donetsk Region
V. V. Chigarеv
Azov State Technical University
Ukraine
Ukraine
Dr. Sci. (Eng.), Professor, Head of the Chair «Metallurgy and Welding Technology»,
Mariupol, Donetsk Region
D. A. Rassokhin
Azov State Technical University
Ukraine
Ukraine
Postgraduate of the Chair “Mechanical Equipment of Ferrous Metallurgy Plants”,
Mariupol, Donetsk Region
V. V. Shishkin
Azov State Technical University
Ukraine
Ukraine
Cand. Sci. (Eng.), Assist. Professor of the Chair «Theoretical and Applied Mechanics»,
Mariupol, Donetsk Region
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Review
For citations:
Loza A.V., Chigarеv V.V., Rassokhin D.A., Shishkin V.V. INVESTIGATION OF THE STRESSED STATE OF CAST METAL AT CYCLED HEATING. Izvestiya. Ferrous Metallurgy. 2016;59(11):781-786. (In Russ.) https://doi.org/10.17073/0368-0797-2016-11-781-786
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