Study of Structure Formation of 09G2S Steel Obtained by the Additive Electric Arc Growth Method

At present, additive technologies, especially the electric arc growth method as the most universal and productive, have been used for the production of individual machine parts. The problem of studying the process of alloy structure formation during electric arc additive growth to ensure the necessary parameters of the material microstructure and its mechanical properties has been especially relevant. Samples for research from steel 09G2S have been produced using a developed stand implementing the technology of 3D printing by electric arc surfacing, the method of microstructural studies on an optical microscope has been applied, and microhardness measurements have been carried out. The features of the structure formation of the 09G2S alloy during additive electric arc growth have been determined, and controlled parameters have been identified to ensure the necessary indicators of the structure and, consequently, the mechanical properties of the alloy. During the study of the samples, it has been found that the linear energy of the surfacing process and the temperature of the thermal cycle play a significant role in the formation of the material structure. The performed study and the established dependencies make it possible to control the structural state of steel 09G2S during surfacing to ensure the required parameters of the microstructure and mechanical properties of the material.