The Microstructure and Properties of the Coating with Vanadium Borides on Carbon Steel by Use of Electron Beam in Vacuum Treatment

DOI

10.2991/icmse-16.2016.50How to use a DOI?

Keywords

Electron beam boronizing; Diffusion layer; Microhardness; Coatings

Abstract

Boronizing of steel surface leads to the formation of two phases (FeB, Fe2B). FeB phase has high brittleness due to its high hardness. Thus, the traditional boronizing cannot be applied for tools and machine parts, working in conditions of dynamic loads, but the new method of electron- beam heating in vacuum shows that it allows forming the coating without a fragile phase . This paper is aimed at studying on the structure and properties of coatings formed by electron beam treatment with various modes. Coatings on steel is formed from the pastes of boron carbide powder, vanadium oxide and graphite powders. Electron beam treatment in vacuum is carried out at different beam currents. It is found that the coatings based on vanadium boride can be formed at beam currents 30 mA and 40 mA. Coatings consist of primary round borides and eutectic. Round- shaped crystals have the similar size. Eutectic has a lamellar structure. X-ray phase analysis shows that there is V3B4 phase. Increasing the beam current above specified values leads to intensive mixing of the paste and the steel matrix. This causes the dendrites formation on the steel surface of the iron-based alloyed with vanadium. The modes of electron beam treatment founded by this paper in a vacuum allow to form the steel surface vanadium borides with high ductility.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Shun-Qi Mei
AU  - Lygdenov B.
AU  - Jin Huang
AU  - Wen-Li Zhang
AU  - Ya-Jie Dong
AU  - Chao Liu
AU  - Butukhanov V.
PY  - 2016/12
DA  - 2016/12
TI  - The Microstructure and Properties of the Coating with Vanadium Borides on Carbon Steel by Use of Electron Beam in Vacuum Treatment
BT  - Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)
PB  - Atlantis Press
SP  - 302
EP  - 307
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmse-16.2016.50
DO  - 10.2991/icmse-16.2016.50
ID  - Mei2016/12
ER  -