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COMMON PART

Project Number24-19-20059

Project titleCreation of scientific and technological foundations for the production of high-nitrogen austenitic flux-cored wires for welding special-purpose steels

Project LeadSoboleva Natalia

AffiliationInstitute of Engineering Science Ural Branch of Russian Academy of Sciences,

Research area 09 - ENGINEERING SCIENCES, 09-205 - Development of new structural materials and coatings

KeywordsArc welding, laser cladding, high-strength steels, hull structures, special equipment, metal-cored wire, nitrogen-containing steel, austenitic steel

PROJECT CONTENT

Annotation
From the analysis of the current state of domestic and foreign hull production of special equipment, it follows that the actual problems in the production of such critical products are the cost of correcting defects, increasing productivity and performance characteristics of welded joints, which are subject to special requirements (resistance to intense dynamic impact, high strength and ductility welds, corrosion resistance). An additional difficulty in the production of large-sized parts (ship hulls of ship and constructions, special equipment, etc.) is the complex constructive shape of such products, which limits the use of preliminary and (or) accompanying heating. For the same reasons, it is impossible to perform post-welding heat treatment. A comprehensive solution to the problems can be the development of austenitic flux-cored wires of the Fe-Cr-Mn-Ni-Mo-Cu-N alloying system with a nitrogen content of 0.25–0.40 wt. %, which will be fulfilled in the present project. The study of the processes occurring during welding of special steels for critical purposes using the developed welding consumables of a new generation will make it possible to obtain welded joints with a unique combination of properties (high strength at the same time as high ductility and toughness). The problems under consideration are at the intersection of such scientific disciplines as physical chemistry, physical metallurgy and welding. To solve them, experimental and theoretical studies will be carried out. In particular, complex metallographic studies, mechanical and corrosion tests, mathematical modeling of physical and chemical processes in the "metal-slag-gas" system will be carried out.

Expected results
Expected results: - theory of development of economically alloyed austenitic flux-cored wires with nitrogen 0.25–0.40 wt. % for welding high-strength steels; - established optimal parameters of the welding/cladding mode of the developed flux-cored wires; - the established effect of the chemical composition of flux-cored wires on the structural-phase state, mechanical, corrosion and magnetic properties of the deposited metal and welded joints made by arc welding/cladding and laser cladding. The scientific significance of the expected results is the development of new compositions of flux-cored wires of the Fe-Cr-Mn-Ni-Mo-Cu-N alloying system with a nitrogen content of 0.25–0.40 wt. %, as well as obtaining new knowledge about the structure and properties of the deposited layers and welded joints from them. Modern methods of testing and research will be used, which are adequate to the tasks set and corresponding to the world level of research. The public significance of the results is the development of a new generation of electrode materials for welding high-strength steels for critical purposes. This will solve a number of production problems in the production of large-sized hulls of special equipment. In particular, it will increase the mechanical characteristics of welded joints, reduce the productivity and quality of welded joints, and reduce production costs.

REPORTS