Formation of Coatings Based on Titanium Cuprides by Explosive Welding with Subsequent Laser Treatment
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INGS UDC 669.38.68:621.791.13
FORMATION OF COATINGS BASED ON TITANIUM CUPRIDES BY EXPLOSIVE WELDING WITH SUBSEQUENT LASER TREATMENT V. G. Shmorgun,1 O. V. Slautin,1 A. G. Serov,1 V. O. Kharlamov,1 and A. S. Kaigorodov2 Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 33 – 39, June, 2020. The effect of laser treatment parameters for copper cladding applied by explosive welding and subsequent rolling on a titanium surface on coating structure and phase composition is studied. It is shown that the relative (compared with VT1-0 titanium alloy) wear resistance of a coating with an increase in titanium content from 30 to 50% increases at 20°C from 2.9 to 4.4, and at 400°C from 1.7 up to 2.0.
Key words: titanium, copper, laser treatment, coatings, titanium cuprides, wear resistance. plating at the surface of titanium with formation of a coating with small displacement coefficient due to insignificant melting of the base; minimum thermal action on basic metal that is particularly important for titanium and alloys based upon it undergoing structural and phase transformations; insignificant residual deformation of treated component; the possibility of treating small surfaces commensurate with the heating spot diameter; creation of pre-requisites for using laser treatment (LT) in order to prepare wear-resistant coatings at the surface of titanium alloy components. The aim of the present work is a study of features of reaction zone (RZ) formation during LT of a layer (copper M1 + titanium VT1-0) system in relation to properties of the wear-resistant coatings obtained at normal and elevated temperatures.
INTRODUCTION The Cu – Ti system is used in order to create wear-resistant coatings on the surface of copper and titanium alloys [1 – 10]. The physical and mechanical properties of these coatings, their composition and structure as a rule are determined by preparation technology. It has been demonstrated in [11, 12] that a promising method for preparing coatings of the Cu – Ti system is heat treatment (HT) by a contact melting regime at 900 – 1000°C and exposure times from 5 to 30 min of copper and titanium layers previously welded by explosion making it possible to form at the copper surface a pore-free material exhibiting good adhesive strength with the base of the coating with hardness of 4 – 5 GPa. However, solution of the reverse problem, i.e., creation of coatings of the Cu – Ti system based on titanium alloys is connected with limitations associated with the specific nature of this technology, i.e., HT by a contact melting regime in the concluding stage of the process for coating formation has an unfavorable effect on the metal base structure (protected titanium alloy). Laser heating exhibits a number of advantages compared with a traditional HT method. High energy concentration within the heating spot creates the possibility of conducting the process with increased heating rates. This in turn facilitates: the possibility of local thermal action on a thin copper 1 2
METHODS OF STUDY Specimen
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