Abstract
The purpose of this work is to study the effect of laser processing on the surface layers of alloys and to study their microstructure and features in order to improve their mechanical properties and increase the production resource of relevant tools and parts of equipment for repair shops of automobile transport in the agricultural sector. The effect of laser processing on the near-surface microstructure of alloys was studied. It is shown which steel will have the maximum hardness as a result of laser hardening among steels 40H13, 30H13 and 20H13. As a result of the change in the chemical composition, the levels of martensitic transformation points in the liquid state zones decrease, and a significant amount of residual austenite (40-60%), characterized by a dispersed structure, remains in them. This has a positive effect on the operational characteristics of irradiated products, especially when exposed to external shock loads. The optimal level of dissolution in R6M5, 9HS and HVG steels of initial carbides to obtain the maximum possible hardness during their laser processing was determined. The value of microhardness and heat resistance of bronze as a result of its laser hardening was investigated. Therefore, the influence of laser processing on the near-surface microstructure of alloys was investigated in order to improve their mechanical properties and increase the resource of production of appropriate tools and parts of automobile transport repair workshops equipment in the agricultural sector. It was determined that the maximum hardness is achieved in the case of hardening steel 40H13, since the carbon content in it is the highest compared to steels 30H13 and 20H13. Also, to obtain the maximum possible hardness during laser processing of R6M5 steel, it is enough to dissolve 30% of the original carbides and 60-70% for 9HS and HVG steels. Treatment of bronze by laser hardening made it possible to achieve values of microhardness up to 700 Hμ50, and heat resistance of the layer up to 350°С. The service life of products made of these laser-hardened alloys is increased by an average of 4-5 times compared to standard heat treatment.
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