Nizhny Novgorod State Technical University (Nizhny Novgorod, Russia)

D. A. Shatagin, Cand. Eng., Associate Prof., Head of the Dept. of Mechanical Engineering Technology and Equipment
M. S. Anosov, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering Technology and Equipment
M. A. Chernigin, Engineer, Dept. of Mechanical Engineering Technology and Equipment, honeybadger52@yandex.ru
Yu. S. Mordovina, Assistant, Dept. of Mechanical Engineering Technology and Equipment
R. A. Petrov, Academic Assistant, Dept. of Mechanical Engineering Technology and Equipment

Abstract:Currently, the process of wire arc additive manufacturing (WAAM) is becoming increasingly popular for creating preforms from structural steel. These preforms can be transformed into fully functional components that can withstand the harsh conditions of the Arctic. During operation, the phenomenon of cold brittleness may occur. The study aims to assess the temperature of the ductile-to-brittle transition of bimetallic billets made of 09G2S and 03Kh24N13G2S steels using the WAAM method. Bimetallic samples and samples without the addition of a second material were produced using this method. The workpieces were surfaced using ER70S-6 (09G2S) and ER309LSI (03Kh24N13G2S) welding wires under optimized surfacing conditions (current strength: 100–120 A, voltage: 20–26 V). Standard samples with a U-shaped concentrator were made from monometallic workpieces and bimetallic samples were made using three different concentrator arrangements for impact bending tests. During the metallographic study, it was found that the structure of both components of the bimetall is uniform along the height of the sample and has a relatively fine-grained structure. There is almost no diffusion zone at the interface between the two different metals. This confirms the possibility of using WAAM in the production of defect-free bimetallic blanks. During the impact bending tests, it was found that the material of the crack initiation zone has a significant impact on the values of the impact strength and the nature of the ductile-to-brittle transition. In particular, a sharp ductile-to-brittle transition was not observed for pure steel 03Kh24N13G2S and the bimetallic material with a concentrator applied perpendicular to the interface between the two materials and located on the side of the steel 03Kh24N13G2S.
This research was supported by grant No. 22-79-10204-P from the Russian Science Foundation.

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