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Öğe Corrosion resistance of powder injection moulded titanium in physiologic serum and artificial saliva(Chinese Acad Sciences, Inst Metal Research, 2010) Candan, S.; Turkmen, M.; Ahlatci, H.; Candan, E.Most of dental implants are made from titanium or titanium based alloys. However, one of the drawback of such implants is high cost due to the technological difficulties in casting method or machining. In this work, powder injection moulding (PIM) method has been used in order to explore lower cost implants without minimising the biocorrosion resistance of the titanium. Corrosion resistance of titanium specimens, produced by powder injection moulding method (PIM-Ti), in physiologic serum and artificial saliva was investigated. Commercially pure bulk Ti (CP-Ti) was used as control sample. Surface oxidation was also carried out to both PIM-Ti and CP-Ti samples. Microstructure and corrosion resistance were investigated using microhardness, X-ray diffraction (XRD), scanning electron microscopy (SEM) and potentiodynamic polarization experiments. Resulting microstructure of PIM-Ti samples contained porosity as compared to CP-Ti control samples. Microhardness of PIM-Ti samples varied with varying applied load whereas it was free from applied load for CP-Ti control samples. Polarisation measurements and SEM analysis revealed that corrosion behaviour of PIM-Ti was reasonably as good as CP-Ti both in as-produced and oxidized conditions in physiologic serum and artificial saliva in spite of its porous structure.Öğe Corrosion resistance of powder injection moulded titanium in physiologic serum and artificial saliva(2010) Candan, S.; Turkmen, M.; Ahlatci, H.; Candan, E.Most of dental implants are made from titanium or titanium based alloys. How- ever, one of the drawback of such implants is high cost due to the technological di°culties in casting method or machining. In this work, powder injection moulding (PIM) method has been used in order to explore lower cost implants without min- imising the biocorrosion resistance of the titanium. Corrosion resistance of titanium specimens, produced by powder injection moulding method (PIM-Ti), in physiologic serum and artificial saliva was investigated. Commercially pure bulk Ti (CP-Ti) was used as control sample. Surface oxidation was also carried out to both PIM- Ti and CP-Ti samples. Microstructure and corrosion resistance were investigated using microhardness, X-ray diffraction (XRD), scanning electron microscopy (SEM) and potentiodynamic polarization experiments. Resulting microstructure of PIM-Ti samples contained porosity as compared to CP-Ti control samples. Microhardness of PIM-Ti samples varied with varying applied load whereas it was free from applied load for CP-Ti control samples. Polarisation measurements and SEM analysis re- vealed that corrosion behaviour of PIM-Ti was reasonably as good as CP-Ti both in as-produced and oxidized conditions in physiologic serum and artificial saliva in spite of its porous structure.Öğe Effect of Aging on the Microstructure and Mechanical Properties of Magnesium Alloy AZ31(Springer, 2016) Kerenciler, H.; Gunduz, S.; Erden, M. Akif; Turkmen, M.; Karabulut, H.The structure and mechanical properties of magnesium alloy AZ31 are studied after conventional and deformation aging under conditions corresponding to the thermal cycle of polymerization in paint coating of cars. The aging is conducted after 3-h solution treatment at 400A degrees C, water quenching, and aging at 180A degrees C for from 10 min to 6 h. Some of the specimens are deformed by 0.5% right after the solution treatment and then aged by the same regime.Öğe The Effect of Vanadium and Titanium on Mechanical Properties of Microalloyed PM Steel(Springer, 2016) Gunduz, S.; Erden, M. A.; Karabulut, H.; Turkmen, M.The effect of Ti and V additives on the microstructure and mechanical properties of microalloyed powder metallurgy (PM) steels is investigated. The microstructure of microalloyed PM steels is characterised with the help of optic microscope, SEM and EDS. The results showed that the addition of Ti and V elements has a beneficial effect on the improved mechanical properties. Ti-V microalloyed PM steels can be used to take advantage of improved grain refining propensity of titanium, whilst allowing vanadium to be used as dispersion strengtheners and to enhance the hardenability and transformation characteristics.Öğe The Effects of Heat Treatment on the Microstructure and Mechanical Properties of Nb-V Microalloyed Powder Metallurgy Steels(Polish Acad Sciences Inst Physics, 2019) Turkmen, M.; Erden, M. A.; Karabulut, H.; Gunduz, S.In this study, the effects of heat treatment on the microstructures and mechanical properties of powder metallurgy (PM) Nb-V microalloyed steels (Fe + 0.25%C + 0.075%Nb + 0.075%V) were investigated. Argon gas was used as sintering atmosphere. The microstructure and mechanical properties of the Nb-V added PM microalloyed steel were examined by optical microscopy, scanning electron microscope (SEM) and tensile tests. Experimental results showed that microalloyed steels can be produced by PM technology and the heat treatment affects the microstructure and mechanical properties of microalloyed PM steel. Nb-V microalloyed steels were heat treated under different conditions. Microstructures and tensile strengths of the samples were compared.Öğe Improvement of mechanical and corrosion properties of magnesium alloy by lead addition(Elsevier Science Sa, 2009) Candan, S.; Unal, M.; Turkmen, M.; Koc, E.; Turen, Y.; Candan, E.Mechanical properties and corrosion behaviour of AZ91 magnesium alloy containing 0.2-1.0 wt.% Pb were investigated. An enhancement of ultimate tensile strength by 42%, yield strength by 58% and elongation by 20% can be achieved by Pb addition. Corrosion resistance of the AZ91 alloy also increased progressively with increasing Pb content. The mechanism of property enhancement is ascribed to the suppression of intermetallic phases (beta-Mg17Al12 and alpha-Mg+beta eutectic) by Pb addition. (c) 2008 Elsevier B.V. All rights reserved.Öğe Martensite morphology and strain aging behaviours in intercritically treated low carbon steel(Taylor & Francis Ltd, 2011) Turkmen, M.; Gunduz, S.The strain aging behaviour of intercritically annealed low carbon steel with different martensite morphologies has been investigated. Aging experiments after 4% prestrain were carried out at 180 degrees C for different times ranging from 10 to 160 min. It was found that the variation in bake hardening response Delta Y, lower yield stress and ultimate tensile stress with aging time describes a similar trend for all three microstructural variants, but the absolute values of bake hardening response, lower yield stress and ultimate tensile stress are higher for the microstructure containing fibrous, more uniformly distributed martensite. The aging response of fibrous martensite was also found to be slower, and the fibrous martensite morphology provided the best combination of strength and ductility as desired for dual phase steels.Öğe Wear behaviour of sintered steels obtained using powder metallurgy method(Kaunas Univ Technol, 2017) Erden, M. A.; Gunduz, S.; Karabulut, H.; Turkmen, M.In this work, the hardness and abrasive-wear behaviour of powder metallurgy (PM) plain carbon steel and microalloyed steels with different amount of niobium or aluminium content (0.1-02 wt.-%) were investigated. It was found that steels microalloyed by niobium and aluminium have high hardness and wear resistance compared with the niobium and aluminium free steel. Wear behavior of these steels depends on the PM processing parameters and wear conditions. Worn surface pattern revealed the wear mechanism is ploughing. The surface exhibited extensive grooving occured as a result of ploughing by the harder SiC paper.
