Fusion of dies with economy-layed secondaryhard-ducted steel

Abstract

Problem. The purpose of the work is to increase the wear resistance and heat resistance of secondary hardening surfacing steels by improving the composition of alloying powder wires due to the optimization of the content of titanium, molybdenum and chromium. It was found that increasing the heat resistance of iron-based Cr-Mn-Ti alloys contributes to an increase in the content of the carbide phase [TiC]; the introduction of [Mo] stabilizes the value of hardness at elevated temperatures, increases heat resistance and hardness during dispersion hardening. High indicators of heat resistance and wear resistance of steel 18X4G10M5T3S are achieved due to additional diffusion formation of the carbide phase during aging, increased contact strength, a significant amount and uniform distribution in the volume of the deposited metal of the carbide phase. Goal. Іncreasing the wear resistance and heat resistance of secondary hardening surfacing steels by improving the composition of alloying powder wires due to the optimization of the content of titanium, molybdenum and chromium. Methodology. For automatic arc surfacing under the flux, attachment devices were designed and manufactured for feeding the de-energized flux-cored wire into the welding bath. The use of these devices on the A-1401 and TS-17M welding machines made it possible to study the influence of the de-sintering additive on the deposition parameters, chemical and phase composition of the deposited metal. The surfacing was carried out on samples made of steel 20 and 50 KhNM according to the "slide" scheme. The powder wire was produced at the laboratory facility of the Department of Welding Production of UIPA. The crack resistance of the alloys was studied at the LTP 1-6 installation. Results. On the basis of experimental studies, it was established that automatic surfacing with a de-energized additive increases the technical and economic indicators of melting - the surfacing coefficient is up to 30 g/Ag, the share of the base metal in the surfacing decreases to 11...14%, reduces the specific fuel costs and energy costs - increases the specific energy for the formation of a seam above the conventional limit of fusion and thermal efficiency. by 60...70% and 40...50%, reduces the coefficients of the relative mass of slag by 24...28%, increases the absorption coefficients of alloying elements by 70...80% in contrast to single-electrode melting. Originality It was found that increasing the heat resistance of iron-based Cr-Mn-Ti alloys contributes to an increase in the content of the carbide phase [TiC]; the introduction of [Mo] stabilizes the value of hardness at elevated temperatures, increases heat resistance and hardness during dispersion hardening. Practical value. On the basis of the conducted research, economically alloyed wear-resistant alloys and the technology of their application were developed to restore the grooves of the matrices of hot metal stamping dies. The use of these alloys and the technology of their application ensures a reduction in energy and resource costs and an increase in the durability of the stamping tool.