Modification of the Surface of Technically Pure Titanium VT1-0 after Various Types of Processing

The purpose of the study is to identify the regularities of the formation of structural-phase transformations of the surface layers of technically pure titanium VT1-0 after various types of combined treatment.  

Methods. The article discusses two types of combined processing of technically pure titanium VT1-0: electro-explosive carburization + heat treatment and electro-explosive doping with yttrium + electron beam treatment. In the first case, electro–explosive carburization was carried out by introducing carbon graphite fibers into the explosion area, and in the second, a titanium foil weighing 100 mg was used as the explosive material, on which yttrium powder weighing 400 mg was placed. The structure of the alloyed layers was studied by light microscopy of straight and oblique cuts after chemical etching. The phase composition of the surface was determined using a DRON-2.0 diffractometer in the radiation of an iron anode. 

Results. As a result of the electroexplosive carburization of technically pure titanium VT1-0, a doping zone with a thickness of 20 microns was formed, a zone of thermal influence passing into the base is visible below. In both cases, a melting and alloying zone with a thickness of about 40 microns and a zone of thermal influence passing into the base were identified. The phase composition of the alloying zone includes titanium carbide, which significantly increases the functional properties of the modified layers. The three-phase composition of the zone of electroexplosive carburization of titanium, represented by a solid solution of carbon, titanium carbide and graphite, was confirmed by X-ray phase analysis.

Conclusion. Combined processing leads to the formation of a multilayer structure; a change in the phase composition of the material; improvement of surface quality without mechanical impact; increase in depth and increase in the functional properties of the hardening zone.

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