In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.206568

Keywords:

powder wire, hardfacing, molybdenum borides, reaction synthesis, abrasive wear

Abstract

This paper reports a study into the formation of the phase composition, structure, and properties of arc welding coatings by the flux-cored electrode materials from the Fe-Mo-B-C system. The welding alloys were applied using the flux-cored arc welding (FCAW) electrodes, which consisted of a shell made from the low-carbon steel filled with a reaction powder mixture that contained boron carbide and molybdenum in a ratio of 1:1.

The calculation of the phase composition of alloys that correspond to the surfaced layers by a CALPHAD method using the Thermo-Calc OpenCalphad software shows that under the equilibrium conditions the boride phases of molybdenum and ferrite cannot co-exist. The main phase of such alloys is a FeMo2B2 compound, which forms the eutectics with austenite. Given that the eutectic structures with borides are characterized by high brittleness, the introduction of components was conducted in the form of a reaction mixture in order to obtain the in situ formed boride phases in the form of separate structural components.

Analysis of the results of studying the microstructure and phase composition of coatings reveals that they consist of three main structural components: the eutectic (FeMo2B2+ferrite) and the grains of molybdenum tetraboride MoB4. Thus, under the conditions of arc welding using the reaction mixture, an irregular structure is formed, which is favorable in terms of ensuring wear resistance due to the high microhardness of MoB4>27 GPa.

The hardness of the coatings obtained is at the level of 63–65 HRC, and the wear resistance is higher compared to standard high-chromium alloys (grades Т620 and Т590) by 2‒2.5 times. This makes it possible to recommend the coating of a given system for hardfacing the working surfaces of equipment in the coal, processing, woodworking industries, etc., where abrasive wear is the dominant type of surface wear

Author Biographies

Pavlo Prysyazhnyuk, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Welding

Liubomyr Shlapak, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Doctor of Technical Sciences, Professor

Department of Welding

Olexandr Ivanov, College of Electronic Devices IFNTUOG Vovchynetska str., 223, Ivano-Frankivsk, Ukraine, 76006

Postgraduate Student

Cycle Commission of Applied Mechanics

Sergiy Korniy, Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine Naukova str., 5, Lviv, Ukraine, 79060

Doctor of Technical Sciences, Senior Researcher, Head of Department

Department of Corrosion and Corrosion Protection

Lyubomyr Lutsak, Limited Liability Company Interdisciplinary Research and Production Center “Epsilon LTD” Makukhy str., 2, Ivano-Frankivsk, Ukraine, 76014

PhD, Production Director

Myroslav Burda, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Associate Professor

Department of Welding

Iryna Hnatenko, V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine Avtozavodska str., 2, Kyiv, Ukraine, 04074

PhD, Senior Researcher

Department of Cemented Carbides and Composite Materials Production Technology

 

Vasyl Yurkiv, The E. O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine Bozhenko str., 11 Kyiv, Ukraine, 03680

Lead Engineer

Department of Physical and Chemical Processes in Brazing No. 029

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Published

2020-08-31

How to Cite

Prysyazhnyuk, P., Shlapak, L., Ivanov, O., Korniy, S., Lutsak, L., Burda, M., Hnatenko, I., & Yurkiv, V. (2020). In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo. Eastern-European Journal of Enterprise Technologies, 4(12 (106), 46–51. https://doi.org/10.15587/1729-4061.2020.206568

Issue

Vol. 4 No. 12 (106) (2020): Materials Science

Section

Materials Science

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Copyright (c) 2020 Pavlo Prysyazhnyuk, Liubomyr Shlapak, Olexandr Ivanov, Sergiy Korniy, Lyubomyr Lutsak, Myroslav Burda, Iryna Hnatenko, Vasyl Yurkiv

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