CREATION OF JOINTS FROM INTERMETALLIC TITANIUM ALLOYS (review)

Skupov, A.A.; Sviridov, Alexander�; Khodakova, E.A.; Афанасьев-Ходыкин, А Н

doi:10.18577/2307-6046-2021-0-7-31-38

Cited by 2 publications

(1 citation statement)

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“…5). Высокотемпера-турная плазма, что возникает в результате данного явления, имеет высокую степень неравновесности, которая достигается в том числе и при атмосферном давлении [29].…”

Section: гибридные технологии нанесения функциональных покрытийunclassified

The current state of laser technologies in the field of functional coatings

Palabugin,

Kalyuzhny

2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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Two main directions in the field of laser radiation application for functional coatings are considered - the application of coatings using purely laser study and the combination of laser and other technologies. The most popular technological lasers used in both directions are identified: gas molecular lasers, diode, fiber, and solid-state lasers. Methods of hardening heat treatment of parts using a laser beam both with and without melting of the material are considered. A method of introducing alloying components of metallic and non-metallic nature into the substrate material using laser technologies is presented. The methods of laser surfacing are given, where the surfacing material is fed into the zone of exposure to laser radiation both in the form of a powder mixture and in the form of a filler wire. Powder mixture is most commonly used as surfacing material, wire is less often used. Technologies of laser-assisted evaporation used in the creation of three-dimensional objects are considered. Hybrid technologies of coating deposition are presented - laser surfacing using a plasma arc and high-frequency heating. It was found out that two types of plasmatrons are used in laser-plasma surfacing - direct and indirect types of action. In addition to hybrid laser surfacing, the method of hybrid laser-assisted evaporation is considered - plasma sputtering, or LAAPS, accompanied by laser heating and allowing to obtain coatings with increased adhesion strength to the substrate surface. The main advantages (the ability to adjust the thickness of the deposited coating layers, reduction of the thermal impact zone) and disadvantages (occurrence of cold microcracks on the surface, formation of pores in the coating) in the application of coatings using laser radiation are considered. The prospects for the development of laser and laser-plasma technologies in the field of functional coatings are analyzed on the example of practical application. The development of these technologies in future is largely due to the elimination of their shortcomings, increasing the efficiency of interaction between laser and plasma technologies.

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Section: гибридные технологии нанесения функциональных покрытийunclassified

The current state of laser technologies in the field of functional coatings

Palabugin,

Kalyuzhny

2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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Structure and mechanical properties of welded joints from alloy based on VTI-4 orthorhombic titanium aluminide produced by pulse laser welding

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Панов

Chernichenko

et al. 2023

Izv.VUZ. Tsvet. Met.

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Ti2AlNb-based alloys are promising materials for operation at high temperatures in aerospace industry. Meanwhile, the existing difficulties of weldability restrict opportunities of their application. This work is devoted to studies of welded joints from Ti2AlNb-based VTI-4 alloy, obtained using pulsed laser welding (PLW). The optimum PLW modes have been determined providing uniform faultless joint. The features of formation of external defects, internal pores, cracks and non-uniform penetration depth were detected depending on welding conditions. The main PLW parameters influencing on formation of welded joint are voltage and duration of laser pulse. It was demonstrated that at insufficient medium and high peak powers sawtooth seam roots and internal pores can be formed. However, at higher rates of energy input thermal hydraulic processes in welding bathe are violated, accompanied by metal splashing (spattering), heterogeneity of pulse imposition is observed. This leads to formation of cracks, higher porosity, heterogeneity of melting zone, and as a consequence, poor mechanical properties. Microstructure analysis of the welded joints obtained by means of PLW has demonstrated that the melting area is comprised of long dendritic grains of β phase, and the heat affected zone from two regions of β + α2 phases and β + α2 + O phases. Herewith, the achieved joint strength equals to ~80 % of the base metal produced using the optimum PLW mode.

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CREATION OF JOINTS FROM INTERMETALLIC TITANIUM ALLOYS (review)

Cited by 2 publications

References 0 publications

The current state of laser technologies in the field of functional coatings

The current state of laser technologies in the field of functional coatings

Structure and mechanical properties of welded joints from alloy based on VTI-4 orthorhombic titanium aluminide produced by pulse laser welding

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