Abstract
The influence of the operating parameters of electric arc heat treatment of the surface layer of graphite flake cast iron type CП-61 on the structure, microhardness of structural components and the size of the hardening zone is studied. It is shown that controlling the arc power, its speed and the degree of overlap of local hardening zones allows purposefully forming modified structural States with properties most suitable for specific operating conditions in the surface working layer of cast iron. Overlapping of local hardening zones allows purposefully forming modified structures with suitable properties for specific operating conditions in the surface working layer of cast iron rolls. According to the research results, regularities of formation of the structure and phase composition and properties of the surface layer of cast iron type CП-61 under the influence of electric arc heat treatment were obtained. Control of parameters of the processing mode (power and speed of the arc, the degree of overlap of local hardening zones) allows you to purposefully form modified structures with suitable properties for specific operating conditions in the surface working layer of cast iron.
Highlights
Hardening of the working surface of cast iron rolls with high and industrial frequency currents in order to form a bleached layer with increased wear resistance is used only in their primary production
A method of surface heat treatment with argon shielded plasma or conventional electric arc [1,2,3,4,5,6,7,8,9] is rational in terms of universality, availability, environmental friendliness and economic efficiency for extending the service life of cast rolls
Without changing the parameters of surface roughness, such treatment is integrated into the process of preparation and repair of rolls, being a finishing operation, low-cost, quite efficient and makes it possible to extend their service life
Summary
Hardening of the working surface of cast iron rolls with high and industrial frequency currents in order to form a bleached layer with increased wear resistance is used only in their primary production. When repairing the worn surface of the rolls, the hardness of the cooler layer formed during manufacturing is reduced. To increase the service life of cast-iron rolls, it is promising to use heat treatment for their working surfaces with a concentrated energy flow. A method of surface heat treatment with argon shielded plasma (constricted) or conventional electric arc [1,2,3,4,5,6,7,8,9] is rational in terms of universality, availability, environmental friendliness and economic efficiency for extending the service life of cast rolls. Without changing the parameters of surface roughness, such treatment is integrated into the process of preparation and repair of rolls, being a finishing operation, low-cost, quite efficient and makes it possible to extend their service life
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