The Paton Welding Journal, 2014, №08



2014 №08 (01)

DOI of Article 10.15407/tpwj2014.08.02

2014 №08 (03)

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The Paton Welding Journal, 2014, #8, 15-20 pages  

REGULARITIES OF CREATION OF MODIFIED INTERLAYERS IN USING OF HIGHLY-CONCENTRATED ENERGY FLOWS

V.F. KVASNITSKY¹, V.V. KVASNITSKY², N.N. CHERENDA³, N.N. KOVAL⁴ and I.L. LEVCHENKO²

¹Admiral Makarov National Shipbuilding University. 9 Geroev Stalingrada Ave., 54025, Nikolaev, Ukraine. E-mail: welding@nuos.edu.ua
²NTUU «Kiev Polytechnic Institute». 37 Pobedy Ave., 03056, Kiev, Ukraine. E-mail: kvas69@ukr.net
³Belarusian State University. 4 Nezavisimosti Ave., 220030, Minsk, Belarus. E-mail: cherenda@bsu.by
⁴Institute of High Current Electronics, SB RAS. 2/3 Akademichesky Ave., 634055, Tomsk, Russia. E-mail: contact@hcei.tsc.ru
 
 
Abstract
Radiation-beam technologies applied for modifying, including those with alloying of surfaces, provide necessary topography of surface, its activation, improvement of adhesion properties, required structure and chemical composition of the surface. These characteristics are further determining in diffusion welding, brazing and deposition of coatings. In the work the low-energy high-current electron beams and high-energy plasma flows for modifying and alloying of the joined surfaces of steels and heat-resistant alloys were used. These types of surface treatment belong to the radiation-beam technologies. The treatment was carried out using low-energy high-current electron beams in vacuum 10^-2 Pa in the installation SOLO of the Institute of High Current Electronics of the SB RAS, and also high-energy plasma flows using magnetic plasma compressor of a compact geometry of the Belarusian State University at the pressure of hydrogen and nitrogen of 3x10² Pa, and welding and brazing were performed in the installation UDSV-DT in vacuum of 10^-2 Pa or super-high vacuum universal technological complex VVU-1D in vacuum of 10^-5 Pa. Independently of metals being investigated the formation of sub-microcrystalline structure, presence of high density of dislocations (up to 10¹¹ cm^-2), appearance of stresses of the 3rd kind, being the evidence of immense increase in level of energy accumulated in modified layer, are characteristic for all the modified layers. The surfaces of heat-resistant nickel alloys were alloyed by zirconium and hafnium, which are the most challenging depressants of nickel brazing alloys. For this purpose the layers of alloying element of 1-3 mm thickness was deposited on the surface using method of ion-plasma spraying and then the surface layer was remelted using low-energy high-current electron beams and high-energy plasma flows. The investigations of processes of formation of modified and alloyed surfaces showed the possibility of efficient control of structure and composition of the modified layer. Diffusion welding in a solid state and with a melting interlayer provides the high quality of joints, which can be confirmed by the structures and mechanical properties of joints. The application of radiation-beam technologies allows expanding the capabilities of joining metals and hardening the materials. 13 Ref., 6 Figures.
 
 
Keywords: surface modifying, electron beam, high-power plasma flow, diffusion welding, brazing
 
 
Received:                30.05.14
Published:               28.08.14
 
 
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