Cheiliakh Y. Development of surface deposition material and surface strengthening technology with formation of wear-resistant metastable alloy

The object of research: processes and mechanisms of forming compositions and properties of metastable surface deposited metal and strengthened surface layers. The subject of research: deposited metal and phase-structural modifications of strengthened surface deposited layers. Research methods: spectral, micro X-ray spectral, metallography, electron-microscopic, X-ray structural; physical-mathematical design, cross-correlation analysis; complex tests on wear resistance. Regularities of the layer-degree character of change in chemical and phase content with regard to the thickness of deposited Fe-Cr-Mn-metal were established; a mechanism of management the phase content and the degree of austenite metastability was proposed by regulating the share of previous layers in the deposited metal, thus making it possible to manage its properties. Introducing carburizator and carbamide into the welding pool raises carbon content up to 0,45 % and nitrogen up to 0,14 % and improves wear resistance. Management of operating properties is enhanced by additional action of high concentration heat sources, ensuring surface phase-structural modifications with required austenite metastability. Full-scale tests of the equipment of ball rolling mill, surfaced with the developed wire PP-Np-12Cr12Mn10SiTiNV at "Azovstal" PSC revealed 1..,5…2 times longer parts service lives, the economic effect is expected to be 914,15 thous. Uah.