Yazar "Sager, Abdulmuaen M M" seçeneğine göre listele

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  • Küçük Resim Yok
    Öğe
    Experimental investigation of machining of nickel based superalloy inconel 625
    (Karabük Üniversitesi, 2018) Sager, Abdulmuaen M M; İşbilir, Özden
    Bu çalışmada nikel bazlı süperalaşım Inconel 625'in delinmesi deneysel olarak incelenmiştir. Araştırmanın temel amacı Inconel 625 malzemeyi delerken kesme parametrelerinin kesme kuvveti, tork, çapak oluşumu, dairesellik ve takım aşınması üzerindeki etkilerini belirlemektir. Bir deney düzeneği (8, 10 ve 12 m/dak. kesme hızları; 0,05, 0,075 ve 0,1 mm/dev. ilerleme) Inconel 625 iş parçasını TiAlN kaplamalı karbür matkap ile kuru ortamda delecek şekilde tasarlanmıştır. İlerleme, itme kuvveti ve dairesellik üzerinde baskın parametre olarak bulunmuştur. İlerlemedeki artış itme kuvvetinde önemli bir yükselişe, dairesellikte ise belirgin bir azalmaya sebep olmuştur. Kesme hızı ile itme kuvveti arasında artan ve azalan eğilimli ilişki gözlemlenmiştir. Tork için belirgin bir eğilim görülmemiştir. İşlenen yüzeylerin ortalama pürüzlülük değerlerinde kesme hızının ve ilerlemenin birlikte etkin olduğu gözlemlenmiştir. Ortalama yüzey pürüzlülüğü, kesme hızı ve ilerlemedeki artışla birlikte genelde azalmıştır. Deneylerde düzgün şekilde kapaklı, kapaksız ve taç tipi olmak üzere farklı türde çapak oluşumları gözlemlenmiştir. Deneylerden sonra takımlar incelendiğinde talaş yığılması, çentiklenme, kesme kenarı ve keski kenarı aşınması, plastik deformasyon ve ani kırılmalar gözlemlenmiştir.
  • Küçük Resim
    Öğe
    INVESTIGATION OF THE MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF ZK60/15% SILICON CARBIDE AND 0.2 - 0.5% NANO ALUMINUM NITRIDE REINFORCED COMPOSITES
    (2023-11) Sager, Abdulmuaen M M
    In this study, the microstructure, hardness, compression, wear, thermal properties, immersion, and potentiodynamic corrosion behaviors of extruded ZK60 matrix composites reinforced with forty-five µm 15% silicon carbide (SiC) particles and aluminium nitride nanoparticle (AIN) reinforcement (0.2-0.5% 760nm) were examined. The manufacturing procedure includes preparing, pressing, and sintering powder mixtures; alloying and casting with melt-based induction mixing; homogenizing and extruding; and, as a last step, checking the microstructure, hardness, compression, wear, corrosion, and thermal properties. a unique technique known as liquid-based mixing was used to prevent the agglomeration of nanoparticle powders and to guarantee their homogeneous distribution while creating powder blends. It was made up of a mixture of 15% SiC,15% SiC with 0.2% AlN, and 15% SiC with 0.5% AlN nanoparticles. The composites' reinforcing materials, SiC and AlN mixes, were first combined with magnesium powder as the primary alloy, crushed under 450 MPa of pressure, and sintered at 420°C. Second, the melt is mechanically mixed after the sintered compacts are added to the ZK60 alloy matrix at the semi-solid melting temperature. The melts are combined for 30 minutes to create a homogenous mixture. The homogeneous mixture is then poured into metal molds to create composite samples. The composite samples were extruded at 300°C with an extrusion ratio of 16:1 and a piston speed of 0.3 mm/s after being homogenized for 24 hours at 400°C. Microstructure studies of the produced samples were done for cast, homogenized, and extruded samples. Microstructure studies revealed that SiC and AlN additions were distributed uniformly across the matrix. Agglomerations in the structure were seen as the reinforcement ratio grew to 0.5%. The number of secondary phases has significantly decreased, but the size of the ?-Mg grains has not changed significantly, according to the microstructure images of the homogenized samples. The dynamic recrystallization (DYK) that occurs during hot extrusion causes all alloys to noticeably reduce their grain size in the post-extrusion microstructure pictures. After microstructure characterization the hardness analysis, the compressive strength, and the dry friction behaviour of all composite samples was investigated. Depending on the percentage ratios of SIC and AlN reinforcement elements in the matrix, it was seen that the compressive strength and hardness of the composites increased, and the friction coefficient decreased. While the wear rate of the unreinforced ZK60 alloy was 4.5e-5 g/m, this value decreased by 37.5 percent to 2.5e-5 g/m in the 0.5% AlN +15% SiC reinforced ZK 60 alloy. In addition, according to the percentages of SiC and AlN reinforcing elements in the matrix, the corrosion resistance increased. It was discovered that the reinforced ZK60+ 15% SiC (ZK60?), ZK60+ 15% SiC+ 0.2% AIN (ZK60??), and ZK60+ 15% SiC+ 0.5% AIN (ZK60???) compounds had potentiodynamic corrosion resistance that was 1.6, 1.8, and 3.5 times higher than that of the unreinforced ZK60 alloy. The calculated immersion corrosion rates for the unreinforced ZK60, ZK60? , ZK60??, and ZK60??? reinforcements were 2090.73, 1748.19, 1479.84, and 1397.79 (mg/year), respectively. The presence of a layer rich in Si-O elements on the surface of the AlN+SiC reinforced composites boosted corrosion resistance, according to the results of the SEM and elemental spectrum response analysis of the corrosion surfaces. According to the XRD results, the creation of Mg2Si intermetallics in the structure of the SiC reinforced composites increased corrosion resistance. ?