Abstract
The article analyzes in detail the stress-strain state during additive manufacturing using silicon bronze CuSi3Mn1 (БрКМц3-1), which is widely used in the machine-building industry for the manufacture of bushings, spring parts, and parts of chemical apparatus. The high cost of non-ferrous copper-based alloys makes it important to use Welding Arc Additive Manufacturing (WAAM) technologies. The processes of layer-by-layer surfacing of silicon bronzes lead to residual stresses at the tensile strength of the material, which can eventually provoke the development of critical defects in the form of cracks. Based on the simultaneous solution of the finite element method for the equations of heat balance and mechanics of a solid deformed body, the peculiarities of temperature distribution and parameters of the stress-strain state for the developed model of a triangular equilateral prism, which is additively generated from CuSi3Mn1 bronze, are determined. Verification of the experimental model with the calculated one was carried out by comparing the thermal cycles of surfacing. Based on the anal-ysis of the results of numerical modeling, it was found that the nature of the temperature change and the magnitude of its decrease in the corresponding layer after the deposition of subsequent layers are the same and do not depend on the deposition trajectory, and the largest residual equivalent plastic deformations are formed in the first layer with a gradual decrease inthe value in each subsequent deposited layer, which is associated with a decrease in the degree of volume of the VAT prism from the 1st to the 10th layer. The lower layers are characterized by a volumetric stress state due to the presence of rigid binders in the form of the substrate and the upper welded layers, which increases the probability of cracking in these layers during the cooling stage due to a decrease in the material's strength below σB< 170 MPa in the temperature range of 475-550 °C
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