2 results listed
Rolling has an important place in iron and steel industry due to the advantages such as production speed, continuity and easy to process applications. Roll materials must be resistant to high heat temperature conditions, high breaking resistance, good surface quality, proper hardness, good wear resistance and thermal shocks. However, producing an alloy material with all of these features together will be very costly. Instead of producing a roll material having all of these properties, it is more economical and practical approach to provide these characteristics by surface modification. In this study, External cooling rollers (ECR) coated by different four techniques which, Flame spray, boriding, titanizing and borotitanizing. After the coating process, the thickness of the coating layer, hardness, and layer structures examined by optic microscope, scanning electron microscope, micro hardness, and X-ray analyses. A wide range of coating thicknesses and microhardness values obtained depending on coating technique. The highest mircohardness obtained in the titanized sample, but the lowest coating thickness. The obtained hardness values were 3 times higher than those in the current application. The cost of rolling will be reduced by increase in ECR tool life.
International Iron & Steel Symposium
UDCS
Mehmet DEMİR
Ali GÜNEN
Mustafa Serdar KARAKAŞ
Vahdettin Koç
Mustafa Sabri Gök
Ahmet ÇÜRÜK
In this study, Cu–Mo composite coatings were produced on copper substrate by plasma spray technique.
Electrical conductivity and microstructure properties of the composite coatings were investigated. Microstructure
and phase composition of the coatings were examined by using optical microscopy (OM), scanning electron
microscope (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDS). The
microhardness experiments were also performed by using a microhardness machine. The electrical conductivity
properties of the coatings were evaluated with eddy current instruments. Although the electrical conductivities of
the coatings are very small compared to the substrate, it has been determined that the coatings exhibit a very good
hardness values in comparison to the substrate.
International Symposium on Light Alloys and Composite Materials
UHAKS
Serkan Islak
Uğur Çalıgülü
Husain R.H. Hraam
Cihan Özorak
Vahdettin Koç