Technology of Strengthening Steel Details by Surfacing Composite Coatings

7th International Scientific and Practical Conference on Innovations in Mechanical Engineering

机械制造;材料科学

Burov, V.G.^1 ; Bataev, A.A.^1 ; Rakhimyanov, Kh.M.^1 ; Mul, D.O.^1

Faculty of Mechanical Engineering and Technologies, Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk

630073, Russia^1

关键词: Chemical compositions;    Concentration of energy;    Disperse particles;    Engineering investigations;    Functional properties;    Metallurgical process;    Strengthening phase;    Structure and properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/126/1/012013/pdf
DOI  :  10.1088/1757-899X/126/1/012013

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The article considers the problem of forming wear resistant meal ceramic coatings on steel surfaces using the results of our own investigations and the analysis of achievements made in the country and abroad. Increasing the wear resistance of surface layers of steel details is achieved by surfacing composite coatings with carbides or borides of metals as disperse particles in the strengthening phase. The use of surfacing on wearing machine details and mechanisms has a history of more than 100 years. But still engineering investigations in this field are being conducted up to now. The use of heating sources which provide a high density of power allows ensuring temperature and time conditions of surfacing under which composites with peculiar service and functional properties are formed. High concentration of energy in the zone of melt, which is created from powder mixtures and the hardened surface layer, allows producing the transition zone between the main material and surfaced coating. Surfacing by the electron beam directed from vacuum to the atmosphere is of considerable technological advantages. They give the possibility of strengthening surface layers of large-sized details by surfacing powder mixtures without their preliminary compacting. A modified layer of the main metal with ceramic particles distributed in it is created as a result of heating surfaced powders and the detail surface layer by the electron beam. Technology of surfacing allows using powders of refractory metals and graphite in the composition of powder mixtures. They interact with one another and form the particles of the hardening phase of the composition coating. The chemical composition of the main and surfaced materials is considered to be the main factor which determines the character of metallurgical processes in local zones of melt as well as the structure and properties of surfaced composition.