The principles of creating combined technologies for surface hardening of parts and tools
DOI:
https://doi.org/10.32782/2225-6733.43.2021.10Keywords:
surface, complex hardening, combined hardening, plasma jet, structure, crack resistanceAbstract
The increase in the complex of operational properties of materials is achieved by performing a combined surface hardening, including the sequential action of various technological methods. The most promising are the technologies of combined modification based on the energy impact of highly concentrated heat sources. At the same time the problem of strengthening of large-sized heavy-loaded products and the tool is especially actual. The influence of the combined induction-plasma hardening of 75X2МФ steel samples on the nature of structural transformations, hardness and fracture toughness was studied. Plasma hardening after induction hardening increases the hardness from HV 780 to HV 930 and the coefficient of dynamic crack resistance from 4,63 MPa ∙ to 9,84 MPa ∙ , which is due to the formation of a surface layer with a highly dispersed structure. An additional factor in increasing crack resistance is the inhibition of cracks at the boundaries of the layers of plasma and induction hardening. An additional increase in the crack resistance of tool steel with combined hardening can be achieved due to the intermediate volume tempering at 300℃ for 1 hour after hardening of the microwave before plasma hardening. This is due to the fuller course of the transformation in the inner zone of high-speed tempering during the subsequent plasma treatment and increase the ductility of the metal in this zone. The structure and texture of the fracture of the inner layers during processing with intermediate tempering are the same as when processing without it, and the destruction also takes place by a «multiple» mechanism. The results of the study show the effectiveness of the combined induction-plasma hardening of the tool: in comparison with the plasma hardening in the initial state and induction hardening, significantly increases the thickness of the hardened layer, hardness, crack resistance and wear resistance of the surface
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