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2The 30th International Conference on Advanced Laser Technologies LM-P-16
ALT'23
Development of technologies for laser thin-layer surface modification
of products made of stainless chromium-nickel steels
P. Ustinov1 I. Rodionov E. Surmenko D. Bessonov T. Sokolova
1- Saratov State Technical University, 77 Polytechnicheskaya st., 410054, Saratov, Russia
The purpose of this work is to develop a technology for creating a thin-layer hardening layer from a finely dispersed tungsten carbide powder.
Along with many advantages, stainless steel also has disadvantages, such as insufficient wear resistance and hardness. One way to solve this problem is to create a hardened layer using laser processing. This process is one of the most effective methods for restoring coatings with increased wear resistance. Laser cladding consists in applying a coating to the surface of the workpiece by melting the base and filler material. Since the base does not melt much, the properties of the coating mainly depend on the properties of the filler material. Finely dispersed tungsten carbide powder with a fineness of 1 ^m, which is widely used in various industries, was chosen as the deposited filler material [1,2].
To conduct the study, a plate made of stainless steel grade 12X18H10T with a size of 150 * 20 mm was used as a prototype. A layer of graphite paste was applied to the surface of the sample to create a bonding layer, over which a layer of fine tungsten carbide powder about 100-200 micrometers thick was spread. For the experiments, a RAYLOGIC V12 6040 laser unit was used. This unit has a continuous radiation method, the active element is carbon dioxide CO2, and the power is 30 W.
During the experiment, the surface treatment modes were changed, the main ones being the radiation power, processing speed, and line density.
To study the surface of the samples before and after processing, the PMT-3M hardness tester was used to study the microhardness of the surface and spectral analysis using the Spektr-2000 installation. The results of measuring the microhardness showed that the upper layers of the surface of the samples were strengthened by 2-3.5 times from the initial microhardness index. When conducting a qualitative spectral analysis, a significant increase in the content of tungsten in the structure of the surface of the samples at a depth of up to 60 ^m was revealed.
[1] Krasnova E.V., Morgunov Yu.A., Saushkin B.P., Shandrov B.V. Development of applied scientific research in mechanical engineering in Russia. Ekonomika v promyshlennosti = Economics in industry. 2021;14(3):274-287. (In Russ.)
[2] Kolomiytsev E.V. Corrosion-fatigue resistance of tee joints of steel 12Kh18N10T and methods for its challenge. Avtomaticheskaya svarka = Automatic welding. 2012;(12): 41-43. (In Russ.)
