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1Hardness increases of titanium samples by laser treatment under compressed graphite powder
X. Egorova*, A. Shamova, A. Sidorova, D. Polyakov, D. Sinev
Institute Laser Technology, University ITMO, Kronverksky avenue 49, St. Petersburg, 197101, Russia
Laser processing of metal parts by varying the parameters of laser radiation allows obtaining specific surface layer properties such as increased hardness, wear and corrosion resistance and resistance. In addition, laser processing provides precise and controlled modification of metal surfaces, allowing to obtain the required characteristics with high accuracy and reproducibility of results in short processing time [1,2]. Thus, further study of laser machining of metal parts has great potential to develop more efficient and sustainable manufacturing processes. But to identify the potential of laser machining to improve the functional properties of the formed surfaces and ensure high productivity of the method, it is necessary to investigate and search for new approaches of machining realization.
This study presents the results of an experimental and analytical investigation into the optimization of laser treatment parameters to regulate the mechanical characteristics of the surface layer of metal samples. The treatment was conducted under an additional compressed layer of graphite powder, which resulted in the formation of a solid coating on the surface with hardness of 2500 HV [3,4]. However, when attempting to scale the layer for real production tools, a few problems were encountered, specifically in providing uniformity distributions of mechanical properties on the surface. Thermal imaging measurements of temperature on the back samples surface performed during laser processing suggested a significant influence of thermal processes on structural changes in the material. Within the framework of the extended approach [5], analytical 3D modeling of the accumulative heating of a titanium plate coated with a graphite layer was carried out under multipulse nanosecond laser irradiation in scanning mode. Comparison of experimental data with modeling results allowed us to evaluate the influence of accumulated heat on the inhomogeneity in the distribution of mechanical properties of samples after laser processing. The obtained results can demonstrate the potential for improving the operational characteristics of products in mechanical engineering or metalworking.
This research was supported by Priority 2030 Federal Academic Leadership Program.
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[4] X.A. Egorova, K.A. Rozanov, A.D. Sidorova, et al, Hardness enhancement by laser modification of titanium under an auxiliary graphite layer, Appl. Phys. A, 129, 855 (2023).
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