2022 №06 (05) DOI of Article
2022 №06 (02)

Automatic Welding 2022 #06
Avtomaticheskaya Svarka (Automatic Welding), #6, 2022, pp. 3-10

Influence of microalloying with boron on the structure and properties of deposited metal of the type of tool steel 25Kh5FMS

A.A. Babinets, I.O. Ryabtsev, I.P. Lentyugov, I.L. Bogaichuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

In the work, the influence of different amounts of boron microadditives on the structure and operational properties of metal of the type of tool steel 25Kh5FMS, produced by arc welding using the experimental flux-cored wires, was experimentally determined. Microalloying additives were introduced directly into the charge of experimental flux-cored wires during their manufacture. It was found that microalloying of the deposited metal of the type of steel 25Kh5FMS with boron in the amount of 0.007...0.04 % does not deteriorate the quality of deposited beads formation and separation of the slag crust. At the same time, when the boron content in the deposited metal is ≥ 0.02%, the formation of a large number of crystallization cracks is observed, which has an extremely negative effect on its operational properties. Moreover, it was experimentally found that the introduction of boron microadditives in the amount of 0.007...0.01% to the deposited metal of the type 25Kh5FMS leads to an increase in its heat resistance and wear resistance at elevated temperatures by 1.2...2.0 times. With an optimal content of microalloying additives, a refinement of the structure of the deposited metal, some increase in microhardness and, probably, the formation of complex spherical carboborides in the alloy matrix occur. In view of the obtained data, it is recommended to use boron in the deposited metal of the type of tool steel 25Kh5FMS in the amount of 0.007...0.01% in order to improve its operational properties. 12 Ref., 4 Tabl., 11 Fig.
Keywords: arc surfacing, microalloying, deposited metal, flux-cored wire, wear resistance, heat resistance, microstructure

Received: 6.05.2022


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6. Babinets, A.A., Ryabtsev, I.O. (2021) Classification of methods of modification and microalloying of deposited metal (Review). Ibid, 9, 2-8. https://doi.org/10.37434/tpwj2021.09.01
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