PJSC UEC-Kuznetsov, Samara, Russia1 ; Samara State Technical University, Samara, Russia2

V. O. Negodyaev, Head of the Welding and Soldering Bureau¹, Postgraduate Student²

PJSC UEC-Kuznetsov, Samara, Russia
D. A. Baranov, Assistant of the Chief Welder for New and Repair Technologies, Candidate of Technical Sciences

Samara State Technical University, Samara, Russia
S. S. Zhatkin, Professor of the Department “Foundry and High-efficiency Technologies”, Candidate of Technical Sciences
K. V. Nikitin, Head of the Department “Foundry and High-Efficiency Technologies”, Dean of the Faculty of Mechanical Engineering, Metallurgy and Transport, Doctor of Technical Sciences, e-mail: kvn-6411@mail.ru

The article presents the results of the study of the structure and properties of the surfaced EP648 material. Direct laser surfacing was performed with an EP648 metal powder composition in a protective gas (argon) environment. In the process of testing, the laser radiation power was varied. The results of microhardness measurements showed that with an increase in laser radiation power from 1000 to 1200 W, the microhardness of the surfaced layers increases, but with a further increase to 1400 W, the figures slightly decrease. The analysis of the microstructure showed that a layered columnar fine-dendritic cast alloy structure is observed in the surfaced material of all samples. The study shows that at a laser radiation power of 1400 W, an optimal surfaced layer with a microhardness higher than that of the substrate material is formed. There are no defects. For a more complete study, a shaft simulator sample was made from 120 mm diameter rod. The material is similar to that of a high-pressure compressor – KhN68VMTYuK-VD (EP-693). Metallographic examination of the surfaced shaft simulator was carried out on fractional and transverse polished sections. Defects in the form of discontinuities at the surfacing boundary are not detected. The microstructure analysis confirmed a significant reduction in the number of pores in the surfacing material and the absence of defects on the boundary of the base material of the sample. The technology of direct laser surfacing of a high-pressure compressor shaft using a simulator sample and restoration of parts and assembly units (PAU) with subsequent installation in a technological product was tested. After disassembling and checking for defects the repaired shaft, which passed the test cycle, no deviations from the design documentation were found. The economic effect of the introduction of the technological process of laser surfacing during the repair of the PAU “High-pressure compressor shaft” was calculated.

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