WAVE STRAIN HARDENING IN THE ADDITIVE SYNTHETIC PROCESS

The article discusses a hybrid technology that combines additive manufacturing of metal products using the WAAM technique and wave strain hardening aimed at improving the mechanical characteristics of the parts being created. WAAM technology is an additive manufacturing technique that through an electric arc melts metal wire, making three D metal products by layering. This technology combines the principles of traditional welding production and additive methods, making efficient parts production of complex shapes possible. Key advantages of WAAM technology are the following: speed of production, which reduces costs, as well as the ability to manufacture large and complex parts that are difficult or impossible to make using traditional techniques. However, when synthesizing products, the most popular problems are heterogeneity of microstructure, porosity and coarse- grain zones, which result in strength loss. To overcome these problems, it is recommended to use wave strain hardening, which provides a significant increase in the depth of hardening, creates compressive residual stresses and promotes fine grinding of the granular structure. A finite element model has been developed in ANSYS for the analysis of temperature fields and mechanical loads in a hybrid process. The simulation made it possible to optimize the modes of synthesis and wave strain hardening, taking into account thermal deformation effects. Experimental studies on the ES868 alloy have confirmed the effectiveness of the approach: the use of wave strain hardening resulted in structure refirenment (up to 10 times), hardness increase by 2,5 times, tensile strength by 1,5 times and yield strength by 2 times at one and the same toughness. The results prove the potential of hybrid WAAM technology and wave strain hardening for large-sized parts manufacturing with improved performance characteristics.