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Zaporizhia, Ukraine

Lysenko N.A.,Motor Sich Company | Pedash A.A.,Motor Sich Company | Kolomoitsev A.G.,Motor Sich Company | Tsivirko E.I.,Kharkiv Polytechnic Institute
Metal Science and Heat Treatment | Year: 2014

The effect of high-temperature treatment of melt (HTTM) and born and zirconium inoculation on the structure and properties of castings from nickel refractory alloys ZhS3LS-VI and ZMI3U-VI is studied. Chemical and gas analyses of the alloys are performed, the macro- and microstructures are investigated, the thermal conductivity, microhardness, mechanical properties at room temperature and the long-term strength are determined. Variants of processes improving the structure and mechanical properties of castings are suggested. © 2014 Springer Science+Business Media New York. Source

Petrik I.A.,Motor Sich Company | Kovalenko T.A.,Motor Sich Company | Ovchinnikov A.V.,Kharkiv Polytechnic Institute
Welding International | Year: 2016

Experimental results show that the application of standard methods of reconditioning components of titanium alloys reduces the mechanical properties of welded joints by up to 30%. The main reasons for this are structural changes and weld defects. The modified (La, Y and B) filler materials were developed from titanium alloys with a submicrocrystalline structure. These materials produce the equiaxed and ductile structures in welded joints in titanium alloys so that the mechanical properties of the welded joints equal 0.9 of the properties of the parent metal. Consequently, the range of repairs of rotors of gas turbine engines can be greatly widened. © 2015 Taylor & Francis. Source

Velikiy V.I.,Motor Sich Company | Yares'ko K.I.,Motor Sich Company | Shalomeev V.A.,Kharkiv Polytechnic Institute | Tsivirko E.I.,Kharkiv Polytechnic Institute | Vnukov Yu.N.,Kharkiv Polytechnic Institute
Metal Science and Heat Treatment | Year: 2014

A theoretical analysis is performed and the main alloying elements are chosen for developing novel magnesium alloys with an elevated level properties. The phase diagrams and the melting temperatures of the alloying elements are shown to be related to the high-temperature strength of the magnesium alloys. The effect of the chemical composition and structural components of the alloy on the mechanical properties and on the refractoriness of the cast metal is determined. © 2014 Springer Science+Business Media New York. Source

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