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RISS 인기검색어
- 검색키워드
- 저자 : Mustafa Ulutan (검색결과 4 건)
- 무료
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Plasma transferred arc surface modification of atmospheric plasma sprayed ceramic coatings
Mustafa Ulutan,Koray Kılıçay,Esad Kaya,İsmail Bayar 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8
In this study, a 90MnCrV8 steel surface was coated with aluminum oxide and chromium oxide powders through the Atmospheric plasma spray (APS) and Plasma transferred arc (PTA) methods. The effects of PTA surface melting on the microstructure, hardness, and wear behavior were investigated. The microstructures of plasma-sprayed and modified layers were characterized by Optical microscopy (OM), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS). The dry-sliding wear properties of the samples were determined through the ball-on-disk wear test method. Voids, cracks, and nonhomogeneous regions were observed in the microstructure of the APS ceramic-coated surface. These microstructure defects were eliminated by the PTA welding process. The microhardness of the samples was increased. Significant reductions in wear rate were observed after the PTA surface modification. The wear resistance of ceramic coatings increased 7 to 12 times compared to that of the substrate material.
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Tribological and Mechanical Properties of Deep Cryogenically Treated Medium Carbon Micro Alloy Steel
Esad Kaya,Mustafa Ulutan 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.4
In this study, the effects of deep cryogenic treatment (sub-zero treatments at -196 °C) on the microstructural,mechanical, and tribological behaviours of commercial Vanadium-Titanium micro-alloyed 38MnVS6+Ti steelwas investigated. The samples were quenched (conventionally heat treated), deep cryogenically treated and thentempered at 250 °C for 1 h. Deep cryogenic treatments were applied for three different soaking times (namely 8 h,12 h, and 24 h). The effects of deep cryogenic treatment on the specimens were evaluated in terms of impact toughness,hardness, wear resistance, and microstructure. The results indicated that the application of longer deep cryogenictreatment times significantly improved wear resistance, and improved the hardness slightly (1 to 3 HRC). However,deep cryogenic treatment also reduced the impact toughness compared to that of the conventionally heattreated sample, due to the precipitation of carbides and increasing hardness.
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Investigation of the Solid Lubrication Effect of Commercial Boron-based Compounds in End Milling
Koray K l çay,Mustafa Ulutan 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.4
Solid lubricants are environmental friendly (green) because they reduce tool wear, the usage of chemical-based cutting fluids, friction and heat during the manufacturing process. In addition, solid lubricants are reusable and easy to handle. Therefore, the solid lubricants that are required in manufacturing processes are efficient, inexpensive, and easily acquired. The present work investigates the usage of different commercial boron compounds (boric acid, boron oxide, boron pentahydrate, and Etidot-67) as lubricants and their performances regarding surface quality, cutting forces and tool wear while machining AISI 1020 steel using HSS end mills. The performance of boron compounds was studied in comparison with that of dry machining. During the metal-cutting process, constant values of the depth of cut, cutting speed and feed rate were used. In the process of milling, the cutting forces were measured with the dynamometer simultaneously. The results indicate that there is a considerable improvement in the machining performance with commercial boron compounds. As a result of using boric acid as a solid lubricant, tool wear resistance improved, the surface roughness values decreased approximately 20 to 32%, and the values of the cutting forces decreased by approximately 15 to 50% compared with dry end milling.
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Hakan Gasan,Ersu Lökçü,Akin Ozcan,Osman Nuri Celik,Ibrahim Celikyurek,Mustafa Ulutan,Yavuz Kurtulus 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
A detailed investigation was carried out to study the effect of Al on the phase volume fractions and wear properties in theAlxCoCrFeMoNihigh entropy alloy (HEA) system. The analysis of phases was studied by X-ray diffraction for further Rietveldrefinement was performed to determine the volume fraction of phases. In order to accomplish experimental studies, thevolume fraction of phases has been analyzed by CALPHAD based simulations. The wear behavior of HEAs were studiedunder dry sliding conditions using a ball-on-disc geometry. The alloy system includes FCC, σ, B2 and BCC phases andexhibits a broad range of phase transformations with varying Al content. The wear behavior of HEAs, in the present work, iscorrelated with their volume fraction of phases and hardnesses. The minimum wear rate, 3.04 × 10−5 mm3/(Nm), is observedin A1.5CoCrFeMoNialloy containing relatively hard σ, B2 and BCC phases, which has a maximum hardness 829.8 HV.
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