The preparation of a hard coating on the area of steel products by the method of combined local strengthening technology with the intensification of the borating process. Effect of laser treatment of steel on increasing the depth of the hardened layer.
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HARDENING TECHNOLOGY OF OBTAINING SOLID COATING ON THE SURFACE OF STEEL PRODUCTS Idan A.F. Surface destruction of machine parts leads to failure of machine mechanisms [1]. The reasons for this are wear of machine parts during operation. A particularly negative effect on the surface of products has an abrasive wear [2]. The reasons for this are friction processes of more solid materials or individual particles on the surface of the machine parts. Predominantly majority of machine parts used on real objects are ferrous metals, namely steel [3]. Substitution of steels with poor mechanical performance properties for more expensive alloy steels with good properties isn’t economically feasible and isn’t always required the high values of strength and hardness throughout the machine part, but rather only on its surface. In this regard, researches to finding ways to improve the technological processes for durability improvement of machine parts are relevant. In this case surface hardening of steel products is interest. It is necessary to take into account the features of methods to increase hardness and strength of the surface layer of steel and the peculiarities of the forming hardened layer on the carbon and alloy steels for development of appropriate technological solutions. 1. The object of research and its technological audit The object of research is a process for obtaining a solid coating on the surface of steel products. One of the most problematic features of this process is the considerable duration of the known methods and the need for a method of local hardening of the surface of machine parts. To identify the features of this process from the perspective of the local surface hardening, technology audit is carried out aiming at the determination of the following process parameters: laser beam velocity, thickness of the hardened surface layer. Technological scheme of the process is shown in Fig. 1. Laser treatment has been undertaken using machine «Ла- тус-31» (Russia), a main view of which is shown in Fig. 2 [4], according to the following modes: - Emission power - 1,0 ± 0,1 kW; - Diameter of the beam focusing area - 5 mm; - Laser beam velocity - 0,5-1,5 m/min. Fig. 1. Technological scheme of the local surface hardening of machine parts Fig. 2. The main view of technological complex «Латус-31» This machine operates as follows. Emitter with longitudinal fast pumping and convective mixture cooling, equipped with a powerful high-voltage DC source. Emission power is continuously monitored by special continuous measurer operating by a tap of emission part (10 %) from the primary beam (2 % accuracy).
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