Tag Archives: coaxial laser cladding

1095-1109 S. Ločs and I. Boiko
Quality assessment of laser cladded HSS coatings with deep penetration into base material to obtain a smooth gradient of properties in coating-substrate interface
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Quality assessment of laser cladded HSS coatings with deep penetration into base material to obtain a smooth gradient of properties in coating-substrate interface

S. Ločs¹² and I. Boiko¹*

¹Riga Technical University, Faculty of Mechanical Engineering, Transport and Aeronautics, Institute of Mechanical Engineering, Viskalu street 36A, LV-1006 Riga, Latvia
²Daugavpils University, Faculty of Natural Sciences and Mathematics, Parades street 1, LV-5401 Daugavpils, Latvia
*Correspondence: irina.boiko@rtu.lv

Abstract:

The present research is dedicated to the study of influence of coaxial laser cladding (CLC) process parameters onto values of alloying components content in the coatings, morphology as well as the influence of post-cladding heat treatment on the quality and mechanical properties of coatings. The research is based on a hypothesis that applying of first layer of coatings onto steel substrate with keyhole in penetration allows achieving smooth gradient of properties of the coating-substrate system. As a result it may provide a smooth distribution of the internal residual stresses in interface as well as the better resistance to external stress during cyclic load in tool operation processes: metal forming, stamping etc. Experimental work was carried out using CLC system, which consists of industrial robot Kuka and 1 kW IPG Yb-fiber laser, integrated to the coaxial powder supplying cladding head. The regularities of formation of High Speed Steel AISI М2 cladding coatings created by different regimes were studied by deposition onto EN 41Cr4 and C80U steel substrates. The quality of achieved coatings has been evaluated by examination of morphology of transverse cross-sections, coatings geometrical features, elemental composition and microhardness distribution inside coatings. Additionally detailed assessment of coating thickness and content of alloying elements using statistical methods has been performed. As a result of the research done the degree of influence of chosen CLC process parameters onto quality characteristics were estimated. The most appropriate cladding regime for used method was proposed.

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1659–1673 S. Locs, I. Boiko, P. Drozdovs, J. Dovoreckis and O. Devoyno
Investigation of coaxial laser cladding process parameters influence onto single pass clad geometry of tool steel
Abstract |
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Investigation of coaxial laser cladding process parameters influence onto single pass clad geometry of tool steel

S. Locs¹², I. Boiko¹*, P. Drozdovs², J. Dovoreckis² and O. Devoyno³

¹Riga Technical University, Faculty of Mechanical Engineering, Transport and Aeronautics, Institute of Mechanical Engineering, Viskalu street 36A, LV-1006 Riga, Latvia
²Daugavpils University, Faculty of Natural Sciences and Mathematics, Parades street 1, LV-5401 Daugavpils, Latvia
³National Technical University, Faculty of Mechanical Engineering B.Khmelnitsky street 9-6, 220013 Minsk, Belarus
*Correspondence: irina.boiko@rtu.lv

Abstract:

This paper is devoted to the investigation of the influence of technological parameters on the single pass clad geometry and quality as well as elemental composition in the clad after coaxial laser cladding (CLC). The objects of the investigation are components of expensive machines and tools for presswork needed to be repaired, i.e. refurbished for the future application with the goal of effective using of material resources in production. Nowadays such repair of worn tools is an actual task due to tendency for thrifty management of resources at affordable cost. Experimental work was carried out using CLC system, which consists of industrial robot and a ytterbium fiber laser with a core diameter of 100 μm, integrated to the coaxial powder supplying cladding head. During research separate cladding tracks of metal powder AISI М2 (particle size 53–150 μm) were deposited on the top surface of steel plates, which were ground before treatment. This work’s highlighted parameters for variation were laser scanning speed and laser beam focus plane distance. The clad geometry was examined on cross-sections with SEM. Elemental composition was determined by the X-ray spectroscopy analysis. Gladding beads with good surface quality were achieved. Cross-sectional observation presented that clads has a good fusion with the base material without exfoliation. Keyhole shape of molten substrate area was achieved, which leads to increase of the dilution value. The future research is needed to achieve stable quality of cladding, which is extremely necessary for industry.

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