Huseyin Cimenoglu

Huseyin Cimenoglu
Istanbul Technical University · Department of Metallurgical and Materials Engineering

PhD

About

235
Publications
52,582
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3,515
Citations
Citations since 2016
64 Research Items
2314 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400

Publications

Publications (235)
Article
Electron beam has been applied as a practical posttreatment process for the surface modification at the CuIn1-XGaXSe2 thin film. The rise of the film thickness indicated the advantages of the modified surface-related properties (such as the optical parameters to develop an optimum optical model) via enriching the microstructure with the negative ch...
Article
Full-text available
Plasma electrolytic oxidation (PEO) treatment of Mg alloys improves their wear resistance by increasing their surface hardness, but also leads to high coefficient of friction (COF) values. The sliding counterfaces and the conditions under which PEO-coated Mg alloys operate affect their COFs. PEO-coated AZ31 alloy sliding against hydrogenated DLC (a...
Article
In this study, an attempt has been made for tailoring the surface features of an 18 vol% porosity containing Ti-23Nb alloy manufactured via powder metallurgy method. The aim was enhancing the wear resistance without sacrificing the mechanical properties. For this purpose, porous Ti-23Nb alloys having hardness of 280 HV0.025 were subjected to therma...
Article
Wear behaviour of quenched and tempered (QT) hot work tool steels (Uddeholm QRO90) was investigated against SAE 52100 grade bearing steel balls after gas nitriding using a dedicated laboratory scale impact-sliding wear test rig. Gas nitriding was employed in a fluidized bed reactor under two alternative regimes: i. “High Temperature Nitriding (HTN)...
Article
In this work, the microstructure of titania coating fabricated on the surface of hydrostatically extruded titanium grade 4 with the use of the micro-arc oxidation method was studied. The surface topography and microstructure investigations performed with atomic force microscopy and scanning and transmission electron microscopy revealed that, by usi...
Article
In this study, Ti6Al7Nb titanium alloy has been subjected to micro-arc oxidation (MAO) process and hydrothermal (HT) treatment sequentially. MAO process was conducted in calcium acetate hydrate (Ca(CH 3 COO) 2 .H 2 O) and disodium hydrogen phosphate anhydrous (Na 2 HPO 4 ) containing reference electrolyte with and without the addition of silver ace...
Article
This study has been initiated to form a silver (Ag)-incorporated titanium oxide (TiO 2 ) outermost layer over a medical-grade 316L stainless steel by subsequent applications of cold spray (CS) and thermal oxidation (TO) processes. X-ray diffraction analysis, scanning electron microscopy examination and Raman analysis revealed that TO at 600°C for 6...
Article
This work has been initiated with the aim of increasing the success of micro-arc oxidation coatings fabricated on aluminium alloys against degradation under sliding contact conditions at high temperatures. For this purpose, the 7075 Al alloy has been micro-arc oxidised in an aluminate-based electrolyte with or without the adding monoclinic ZrO2 par...
Article
In this work, a post treatment of laser surface melting (LSM) has been employed on Stellite 6 and 10 wt.% Mo-alloyed Stellite 6 hardfacings deposited by plasma transferred arc (PTA) process. LSM process refined the microstructures of both hardfacings, while favoring a network-like complex carbide dominated microstructure in the Mo-alloyed version....
Article
Full-text available
The article aims to comprehend the microstructural changes, in Plasma Transfer Arc (PTA) deposited M2 high speed steel (HSS) hardfacings upon incorporation of 10wt% Mo alloying during deposition followed by laser surface melting. PTA deposited hardfacings were produced over 4140 steel. Then Mo alloyed and unalloyed PTA deposits were subjected to la...
Article
In this study, the effect of Co addition on the microstructure and creep rupture properties of 9Cr-1.8W-xCo weld metals is investigated. Herein, stick electrodes were fabricated for producing weld metals with 0.5, 1.0, and 1.5 wt pct Co and without Co, which were then processed by post-welding heat treatment at 760 °C for 4 hours. The microstructur...
Article
This work examines the role of counterface materials on the tribological behaviour of Mg alloys subjected to plasma electrolytic oxidation (PEO) process and focuses on reducing the sliding coefficient of friction (COF) values of PEO treated surfaces. Surfaces of AZ31 grade Mg alloy were subjected to a PEO treatment in a sodium metasilicate and pota...
Article
This study focuses on longitudinal cracks created within the weld seam of electric resistance welded steel pipes, after quenching and tempering processes. Results of the structural examinations conducted by utilizing optical microscope, energy-dispersive spectrometer equipped scanning electron microscope and X-ray diffractometer suggest that mangan...
Article
Room temperature tribological behavior of the thermally oxidized (at 600°C for 60 h in air) low-pressure cold spray coatings fabricated on a Co-Cr alloy by deposition of Ti (85-95wt.%) and Al (5wt.%) powder mixture with and without the addition of Zn powder (up to 10wt.%) were examined. At the outermost surface, the thermal oxidation caused mainly...
Article
Full-text available
Cu(In, Ga)Se2 thin-film samples were derived at different pH-values changing from 1 to 4 via sol–gel dip coating technique to obtain cost-effective polycrystalline thin film after annealing at 150 °C in air. The structural characterization and the physical properties (such as optical and electrical properties) were investigated for different pH-val...
Article
In the present work, the influence of alumina (Al2O3) and zirconia (ZrO2) incorporation on the structural properties and wear resistance of titania (TiO2) based micro-arc oxidation (MAO) coatings fabricated on Ti6Al4V alloy was studied. For this purpose MAO was employed in a silicate-based electrolyte with and without additions of Al2O3 and ZrO2 pa...
Article
Full-text available
Electron beam surface melting has been applied as a post-treatment to plasma transferred arc deposited Stellite 6 hardfacing and its molybdenum alloyed version. Molybdenum addition increased the surface related properties, i.e. hardness and wear resistance via enriching the microstructure with carbides. Application of electron beam surface melting...
Article
Full-text available
In the scope of this study, quenched and tempered H13 steel samples were subjected to conventional (CN) and low temperature (LTN) gas nitriding in a fluidized bed reactor. Structural examinations revealed that surfaces of the CN sample were covered with about 1-2 µm thick compound layer (CL) with an underlying ~30 µm thick nitrogen diffusion zone (...
Article
Full-text available
Purpose The purpose of this study is to investigate the effect of electron beam surface melting (EBSM) on the properties of Plasma Transfer Arc (PTA) deposited Stellite 12 hardfacing. Design/methodology/approach For this purpose, structural characterization and dry sliding wear tests have been conducted on the hardfacings at room temperature. Th...
Conference Paper
In metal forming process, improving mechanical and surface properties of tool steels has been significant issue, since the productivity is mainly related with the service life of tools. In order to enhance service life of tools, wear is the most challenging problem to tackle due to its detrimental effects on surface and dimensional characteristics...
Article
Full-text available
This study aims to understand the oxide scale formation on the surfaces of commercial and Mo (10 wt.%)-modified Stellite 12 hardfacings deposited on 4140 steel. For this purpose, samples of the hardfacings were isothermally oxidized in air at various temperatures in between 500 and 900 °C for 30 h. As a result of changes in the microstructure upon...
Article
Full-text available
Abstract: Purpose The purpose of the study is to examine the sliding wear performance of plasma transfer arc (PTA) deposited and laser surface melted (LSM) Mo modified Stellite 12 hardfacings under high contact stresses (i.e. >20 GPa). Design/methodology/approach For this purpose, after structural characterization, sliding wear tests have been con...
Article
Full-text available
Poly(methyl methacrylate) PMMA was prepared by using Atom Transfer Radical Polymerization technique. The production of PMMA as thermoplastic polymer was executed as an effective way by using the living polymerization technique. The changes in magnetisation properties of PMMA were determined with the rise of the polymerisation temperature from 45 °C...
Article
This study focuses on the surface modification of a medical grade Co-Cr alloy via combining cold spray and thermal oxidation processes. After deposition of a Ti96-Al4 (wt.%) coating, samples were oxidized at 600 °C for 60 h in air. Oxidation transformed the coating into a dual-layered structure comprising an outer oxide layer (mainly rutile) with a...
Article
Aluminum doped zinc oxide (ZnO:Al) thin films via 1.2 at. % Al content was deposited on p-type silicon wafers by using sol-gel dip coating technique to compare the effect of post treatment ambient on electrical characteristics of ZnO:Al/p-Si heterojunction. The annealing environment treatment was performed at 700 °C for 60 min under various gas amb...
Article
This study was initiated with the aim of extending the usage of magnesium alloys especially in corrosion and wear related engineering applications by coating their surfaces via micro arc oxidation (MAO). Considering the individual influence of phosphate-based and aluminate-based electrolytes on the corrosion and wear performances of the synthesized...
Article
This study investigates the effect of 10 wt% Mo alloying of NiCrBSi hardfacing on the microstructure and dry sliding wear performance at room temperature and elevated temperatures up to 700 °C. Mo additions refined the boride and carbide phases in the microstructure and formed a Mo-rich boro-carbide along with a 20% drop in its hardness. It further...
Article
Full-text available
The objective of this research is for Ti6Al4V alloy turnings, generated during the machining of implants, to produce powders for the fabrication of Ti base coating via the cold spray method. In order to decrease the cost of powder production and increase the recycling rate of the turnings, the hydrogenation-dehydrogenation (HDH) process has been ut...
Article
This study focuses on the biological properties of Ti6Al4V after employing micro-arc oxidation in sodium phosphateand calcium acetate-containing electrolyte with and without addition of silver acetate. After micro-arc oxidation process, structural features of the surfaces were analyzed by using an energy dispersive X-ray spectrometer equipped scann...
Conference Paper
Magnesium and its alloys are attractive lightweight materials for the applications of aerospace, chemistry, biomedical, automotive, electronic, and communication industries. Although, magnesium and its alloys exhibit low density and high strength/weight ratio, their applications are broadly limited due to their very low corrosion resistance especia...
Article
Full-text available
This study has been initiated to form a TiO2 layer having enhanced biological properties on the surface of a CoCr alloy, which is mostly used in manufacturing of orthopaedic implants. As a novel approach, CoCr alloy samples were first coated with titanium and then oxidised in air at 600°C for 60 h. Surface characterisation of the samples were made...
Conference Paper
Full-text available
In this investigation the sliding wear of plasma transfer arc (PTA) deposited and laser surface melted (LSM) commercial Stellite 12 hardfacings under high contact pressure was studied. Sphero-conical diamond indenter was used as a sliding counterface with different normal loads. The wear behavior of PTA deposited Stellite12 was very different from...
Article
This study has been carried out to optimise the silver (Ag) content of the coating synthesised on commercially pure titanium (Cp–Ti, Grade 4) for biomedical applications by micro-arc oxidation (MAO) process. The MAO process has been conducted in electrolytes containing silver acetate (AgC2H3O2) at different concentrations between 0 and 0·002 mol L⁻...
Article
Aiming at additional improvements in the properties of Stellite 12 PTA hardfacing alloy deposited on 4140 steel substrate, the authors have adopted a dual approach. During PTA deposition Stellite 12 hardfacing powder was alloyed with 10 wt-% Mo, followed by laser surface melting (LSM). Addition of 10 wt-% Mo, led to an increase in the volume fracti...
Article
Full-text available
This study deals with the failure analysis of broken fencing blades (one épée and one foil). For the characterization of the broken blades, metallographic examinations, chemical analysis, hardness measurements, fracture surface examinations and tensile tests were performed. Maximum stress occurred at the outer fibres of the blades was estimated as...
Article
Micro-arc oxidation is a simple, single-step surface modification method used to produce coatings on titanium alloys for biomedical applications. The formation and properties of coatings can be widely controlled by adjusting process parameters such as applied voltage, frequency, processing time and electrolyte composition. In the present study, thr...
Article
Full-text available
Micro-arc oxidation (MAO) is an attractive process for the fabrication of protective coatings on aluminum alloys used in many industrial applications, such as automotive, structural and aerospace. However, improvements in the corrosion resistance of aluminum alloys upon covering their surfaces with MAO coating may not be sufficient for extending th...
Article
Full-text available
In this study, structural characteristics and tribological performance of the coatings deposited on a 1050 quality aluminium substrate by cold spraying of the feedstock consisting of 100% Al–12Si and 25 vol.% SiC + 75 vol.% Al–12Si powders were examined. Wear tests were conducted in air and in water against alumina ball under loads of 1 and 5 N by...
Conference Paper
In the present study, wear and corrosion resistances of magnesium alloys are analyzed after coated by micro arc oxidation (MAO) process for protection of gear component, which is the most wearing part of a bicycle. Two of the most common magnesium alloys (AZ31 and AZ91) were used in the study and they were oxidized in three different electrolytes (...
Conference Paper
This study gives some information about the preparation of Glycidyl Methacrylate (GMA) microcapsules with Melamine Formaldehyde (MF) resin as a shell material (MF-GMA). Melamine formaldehyde resin containing hydroxyl groups was synthesized in the first step. Second step includes the addition of GMA monomer along with Sodium Dodecyl Benzenesulfonate...
Conference Paper
Full-text available
Magnesium and its alloys could be attractive biomaterials due to their close mechanical properties to the that of human bone, but their corrosion resistance in many aqueous media such as body fluid is the key factor restricting their extensive use. Therefore, coating of these materials appears as a technical solution to overcome this handicap, so t...
Article
Full-text available
This work provides an overview of organosilane metal pretreatments with a focus on water-based systems. Furthermore, this work aims to point out the key notes for organosilane technology to be fully transferred to industry.
Article
This study compares the tribological behaviour, of cold sprayed (CS’ed), SiC particle (SiCp) reinforced Al-12Si matrix composite coatings deposited on 1050 grade aluminium, in two different testing environments (dry and water). The increase in hardness with incorporation of SiCp caused the coatings to exhibit lower wear rate and friction coefficien...
Article
The structure of titanium alloy Ti6Al7Nb (the surface nitride layer, the intermediate layer and the diffusion layer) is studied after nitriding at 950, 1120 and 1250°C for 12 h at atmospheric nitrogen pressure. The thickness of the nitride and diffusion layers is shown to increase with increase in the nitriding temperature. The growth of the nitrid...
Conference Paper
Full-text available
With an aim of additional improvements in the properties of Stellite 12 PTA hardfacing alloy deposited on 4140 steel substrate, the authors have adopted a dual approach wherein Stellite 12 hardfacing powder was chemically modified by the addition of 10wt% Mo. Secondly a post deposition treatment comprising of Laser Surface Melting (LSM) was conduct...
Article
Purpose This paper aims to study microstructure and high temperature tribological performance of hypo-eutectic CoCrWC hardfacing alloy (Stellite 12) deposited on steel substrate by plasma-transferred arc (PTA) welding technique. Design/methodology/approach Microstructural characterization of the deposited coating was made using electron probe micr...
Article
Structural and mechanical properties of La2O3 added (up to 5 wt.%) t-ZrO2 compacts were examined with the aim of optimizing hardness and fracture toughness for room temperature applications. Structural examinations were performed using an X-ray diffractometer and a scanning electron microscope. Mechanical properties of the compacts were determined...
Article
Full-text available
Purpose: The aim of this study was to examine the structural and mechanical properties of coatings formed on CuAl2 in-situ reinforced aluminium matrix composites (AMCs) by micro arc oxidation (MAO) process. AMC, which were fabricated by powder metallurgy method upon addition of copper powder into aluminium powder at different percentages (0%, 15 wt...
Conference Paper
Full-text available
Magnesium and aluminum alloys are attractive for engineering applications owing to their lightweight and high specific strength. Friction stir welding is a relatively new, environment friendly, non-fusion welding method and favored for magnesium and aluminum alloys due to reduction of distortion and residual stresses compared to conventional weldin...
Article
This study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb3B4 and NbB2 phases) which were mechanochemically synthesized from Nb2O5, B2O3 and Mg blends and purified by HCl leaching w...
Conference Paper
Full-text available
This study, the application of a thermal power plant using 13CrMo4-5 and X10CrMoVNb9-1 series steel quality in the stress relieving heat treatment or known as Post-Weld Heat Treatment (PWHT), is examined related to mechanical properties of the temperature range. Working in Thermal Power Plant environment certified by sampling of the steel used in t...
Article
Full-text available
Purpose: Aim of the study is to improve the bioactivity of CoCr alloy upon covering the surface with titanium based coating. Design/methodology/approach: CoCr alloy was coated by cold spraying of powder mixture having a composition of 92 wt.%Ti + 8 wt.%Al. Coated samples were thermally oxidized at 600°C for 60 hours. Characterization of the coating...
Article
Composite coatings were deposited on commercially pure copper substrates by cold spraying of feedstock consisted of copper and Al 2 Cu powders. The amount of the Al 2 Cu powder incorporated in the feedstock varied in between 0 and 15 vol.%. Characterisations of the coatings were done by microstructural examinations, hardness and electrical conducti...
Article
New results about the scratch practical adhesion-resistance of the CoB–Co2B/substrate system developed at the surface of CoCrMo (ASTM-F75) alloy were estimated. The boron diffusion on the surface of the cobalt alloy was conducted using the powder-pack boriding process at temperatures of 1223 and 1273 K with different exposure times for each tempera...
Patent
Full-text available
Invention is related to formation of thick aluminium oxide on the magnesium and magnesium alloys. The two sequential surface treatments applied are cold gas dynamic spraying and micro-arc oxidation processes. In the invented method, first aluminium is coated on magnesium surface by cold gas dynamic spraying technique. Due to this process, no undesi...
Article
The structural features, biocompatibility, and mechanical performance of a titania (TiO 2) layer with incorporated zirconia (ZrO 2) formed by microarc oxidation on commercially pure titanium have been examined in the present study. In comparison to the ZrO 2-free TiO 2 layer, the ZrO 2-incorporated oxide layer was dense and contained ZrTiO 4 as a n...
Chapter
Full-text available
Total joint replacement has a 125-year history, beginning when Themistocles Gluck replaced a degenerated joint with an ivory prosthesis in 1890. At that time, biotribological issues had not been of particular interest, since the implant stability limited clinical use for a long period. Once the issue of stable prosthesis fixation was solved with th...
Presentation
Full-text available
A general view on promising new approaches and applications of carbon nanotube aerogels