Browsing by Author "Ulutan, Mustafa"

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    Microstructural andWear Characteristics of High Velocity Oxygen Fuel (HVOF) Sprayed NiCrBSi–SiC Composite Coating on SAE 1030 Steel
    (Arabian Journal for Science and Engineering, 2011) Buytoz, Soner; Ulutan, Mustafa; Islak, Serkan; Kurt, Bülent; Çelik, O. Nuri
    In this paper, wear properties of NiCrBSi–SiC coatings were investigated using the ball-on-disk wear test. In experimental study, NiCrBSi–SiC powders were sprayed using a high-velocity oxygen fuel technique on an SAE 1030 steel substrate. Powder mixtures with different weight mixing ratios, NiCrBSi + 10 wt% SiC, NiCrBSi + 20 wt% SiC and NiCrBSi + 40 wt% SiC coatings were prepared. The deposited coatings are compared in terms of their phase composition, microstructure and hardness. It is proved that the degree of mixing of the NiCrBSi and SiC components in the powder has a massive effect on the phase composition, microstructure and hardness of the coatings.Wear tests were conducted on both the uncoated and coated substrates at same normal load, speed, and wear distance. It has been determined that the coated substrates exhibit a very good tribological performance in comparison to the uncoated substrate. The increase in the adhesive wear resistance provided by the coating has been attributed to the presence of a large amount of dispersed Ni and Cr carbide and/or borides in the Ni matrix.
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    PLAZMA TRANSFERLİ ARK KAYNAK YÜZEY İŞLEMİYLE AISI 304 PASLANMAZ ÇELİK YÜZEYİNE WC-Ni-B4C KOMPOZİT KAPLAMASININ MİKROYAPISAL KARAKTERİSTİĞİ
    (e-Journal of New World Sciences Academy 2010, Volume: 5, Number: 1, Article Number: 1A0063, 2010) Buytoz, Soner; Ulutan, Mustafa; Kurt, Bülent; Islak, Serkan; Somunkıran, İlyas
    Bu çalışmada, AISI 304 paslanmaz çelik yüzeyine B4C-Ni-WC karbür ve element tozlar plazma transferli ark kaynak kaplama yöntemiyle alaşımlandırılmıştır. Kaplama tabakası; optik mikroskop (OM), taramalı elektron mikroskobu (SEM), X-ışın difraktogramı (XRD) ve X ışını enerji dağılım spektrometresinden (EDS) faydalanılarak incelenmiştir. Optik mikroskop ve mikroyapı incelemeleri neticesinde, kaplama tabakası ile alt tabakanın birbirlerine metalurjik olarak bağlandığı ve yapıda ostenit (), (Cr,W)2B, Fe23(C,B)6, Cr7C3 ile Ni4B3 faz ve karbürleri belirlenmiştir. Kaplama tabakasının adhezyon aşınma direnci, yapıda mevcut karbür ve fazlardan dolayı, alt tabakaya göre oldukça yüksek değerde olduğu tespit edilmiştir. In this study, B4C-Ni-WC powder was been alloyed on the 304 stainless steel surface by using plasma transfered arc (PTA) weld surfacing process. Alloyed layer and interface were examined with optical microscope (OM), scanning electron microscope (SEM), and X-Ray diffraction (XRD) and energy dispersive spectograph. OM and SEM observations have been shown that the obtained coating had a smooth and uniform surface, as well as a metallurgical combination with the AISI 304 stainless steel substrate without cracks and pores at the interface. The austenite (), (Cr,W)2B, Fe23(C,B)6, Cr7C3 and Ni4B3 phase and carbides have been determined in the microstructure. The adhesive wear resistance of the coating layer is higher than the AISI 304 stainless steel substrate material due to the forming of hard carbides.
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    PTA İLE ÜRETİLEN Cr3C2+SiC-ESASLI KAPLAMALARIN MİKROYAPI ÖZELLİKLERİ
    (PTA ile üretilen SiC+Cr3C2-esaslı kaplamaların mikroyapı özellikleri, Proceedings of 13th International Materials Symposium (2010), 1191-1198, Denizli-Turkey, 2010) Yıldırım, M.Mustafa; Islak, Serkan; Ulutan, Mustafa; Karagöz, Muzaffer; Buytoz, Soner
    Bu çalışmada, Cr3C2 ve SiC toz karışımının AISI 304 paslanmaz çeliği yüzeyine plazma transferli ark kaynak yöntemi ile kaplanabilirliğinin araştırılması amaçlanmıştır. Elde edilen kaplamalarda SiC oranı ağırlıkça % 0- 100 arasında değiştirildi ve mikroyapı ve sertlik üzerine SiC’ün etkisi deneysel olarak araştırıldı. Kaplama tabakasının mikroyapısı ve mikrosertlik testi, optik mikroskop (OM), taramalı elektron mikroskobu (SEM), Xışın difraktogramı (XRD), X ışını enerji dağılım spektrometresi (EDS) ve mikrosertlik test cihazı ile incelenmiştir. Yüzeyden alt tabakaya doğru kaplama derinliği boyunca mikrosertlik değişimleri tespit edildi. Mikroyapıda oluşan γ-(Fe, Ni), Cr7C3, Cr23C6, Fe5C2, Cr3Si, CrSi2, Fe0.64Ni0.36, CFe15.1, C-(Fe, Cr)-Si fazlarının varlığında kaplama tabakalarının sertlik değerlerinde belirgin bir şekilde yükselme olduğu belirlenmiştir. In this work it has been aimed the investigation of the ability for cladding of AISI 304 stainless steel with Cr3C2 and SiC powder mixture by use of plasma transferred arc welding process. SiC rate in produced coated layer was changed between 0-100 wt.% and the effect of SiC in chosen mixture on the microstructure and hardness of the coating was tested experimentally. The microstructure and micro hardness of coating layer were investigated by using of optical microscope (OM), scanning electron micrograph (SEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray analysis (EDS) and micro hardness tester. It has been observed that through the forming of hard phases; such as γ-(Fe, Ni), Cr7C3, Cr23C6, Cr3Si, CrSi2, Fe0.64Ni0.36, CFe15.1, C-(Fe, Cr)-Si, the hardness of coated layer was increased clearly.