Abstract
The cold resistance and fracture mechanisms of specimens made of 08Г2С and 07Х25Н13 steels obtained by 3D printing by electric arc surfacing at low temperatures are considered. It is determined, that with a decrease in temperature, the impact toughness of steels decreases. The impact toughness of specimens cut along the deposition direction is higher than that of specimens cut in the transverse direction. It is shown, that the brittle component prevails in the fracture of 08Г2С steel at temperatures below –40 °C, and the viscous component is observed in the fracture of 07Х25Н13 steel over the entire temperature range. A relationship is established between the fractal dimension of the fracture surface and the amount of the viscous component. Keywords: 3D printing, cold resistance, fracture mechanisms, ductile-brittle transition, fractal dimension. uru.40@mail.ru
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