Yazar "Acarer, Mustafa" seçeneğine göre listele

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    The effect of heat treatment on high temperature mechanical properties of microalloyed medium carbon steel
    (Elsevier Sci Ltd, 2006) Guenduez, Sueleyman; Acarer, Mustafa
    In the present work, high temperature tensile properties and abrasive wear performance of a microalloyed medium carbon steel has been examined. Tensile and abrasive wear testing were carried out on as-received and heat treated specimens. The research has shown that microalloyed medium carbon steel was susceptible to dynamic strain ageing due to interaction of mobile dislocations and solid atoms, such as carbon and/or nitrogen. The interaction between dislocations and solid atoms at 200-300 degrees C changes the work hardening rate and contributes to dynamic strain ageing. These interactions also increased abrasive wear resistance of the microalloyed medium carbon steel at 300 degrees C. Therefore, the inference can be drawn that dynamic strain ageing caused an improvement on abrasion resistance. (C) 2005 Elsevier Ltd. All rights reserved.
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    The Effect of Nickel on the Microstructure, Mechanical Properties and Corrosion Properties of Niobium-Vanadium Microalloyed Powder Metallurgy Steels
    (Mdpi, 2020) Ahssi, Mohamed Ahmed Mohamed; Erden, Mehmet Akif; Acarer, Mustafa; Cug, Harun
    In this study, the effects of adding Ni in different ratios to Fe-matrix material containing C-Nb-V produced by powder metallurgy on microstructure, tensile strength, hardness and corrosion behaviors were investigated. Fe-C and Fe-C-Nb-V powders containing 5%, 10%, 13%, 15%, 20%, 30% and 40% nickel were pressed at 700 MPa and then sintered in an Ar atmosphere at 1400 degrees C. Microstructures of the samples were characterized with optical microscope, scanning electron microscope (SEM) and XRD. Corrosion behaviors were investigated by obtaining Tafel curves in an aqueous solution containing 3.5% NaCl. Mechanical properties were determined by hardness and tensile testing. While Fe-C alloy and Fe-C-Nb-V microalloyed steel without Ni typically have a ferrite-pearlite microstructure, the austenite phase has been observed in the microstructures of the alloys with 10% nickel and further. Yield and tensile strength increased with nickel content and reached the highest strength values with 13% Ni content. The addition of more nickel led to decrease the strength. Analysis of Tafel curves showed that corrosion resistance of alloys increased with increasing nickel concentration.
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    Electrical, Corrosion, and Mechanical Properties of Aluminum-Copper Joints Produced by Explosive Welding
    (Springer, 2012) Acarer, Mustafa
    This study investigates the microstructure, electrical, corrosion, and mechanical properties of plate-shaped aluminum-copper couple produced using the explosive welding method. Mechanical tests, including hardness, tensile, tensile-shear, and impact test, concluded that the Al-Cu bimetal had an acceptable joint resistance. In this study, local intermetallic regions formed on the interface of the joint of the aluminum-copper bimetal, produced using the explosive welding technique. However, the formed intermetallic regions had no significant effect on the mechanical properties of the joint, except for increasing its hardness. According to electrical conductivity tests, the Al-Cu bimetal had an average electrical conductivity in comparison to the electrical conductivity of aluminum and copper, which were the original materials forming the joint. According to the results of electro-chemical corrosion test, during which galvanic corrosion formed, the Al side of the Al-Cu bimetal was more anodic due to its high electronegativity; as a result, it was exposed to more corrosion in comparison to the copper side.
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    Finite element modelling of the fatigue damage in an explosive welded Al-dual-phase steel
    (Walter De Gruyter Gmbh, 2023) Elitas, Muhammed; Goktas, Mustafa; Acarer, Mustafa; Demir, Bilge
    In this study, production of dual phase steel-Al 1100 aluminium alloy laminated composite by explosive welding and investigation the microstructural and mechanical properties especially fatigue life of the composite and its components were aimed. Finite element analysis (FEA) was used to simulate the bending fatigue tests of the Al 1100-DP steel (LITEC 1050) bimetal. A semi-wave at the explosive interface with intermetallic was obtained as a microstructural result. Hardness was increased near the interface due to deformation and intermetallic formation at the explosive weld interface. The impact test results showed that the samples' impact toughness was enriched by fabricating steel-Al laminated composite. The results also showed that the Al 1100-DP steel (LITEC 1050) bimetal composite properties were appropriate to the composite theory and satisfied strength-ductility relations accomplished. Additionally, the bending fatigue test and FEA results were compatible. Moreover, fatigue cracks were observed at the explosive weld interface between Litec DP steel and intermetallic but not at the Al-intermetallic interface.
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    INFLUENCE OF PUNCH SHAPES ON FORCES AND PART QUALITY IN THE PUNCHING OF EXPLOSIVELY WELDED DP600, A11100, AND DP600-A11100 COMPOSITE PLATES
    (Univ Zagreb Fac Mechanical Engineering & Naval Architecture, 2022) Ali, Khalil Belras; Demir, Bilge; Gurun, Hakan; Acarer, Mustafa
    This study theoretically and experimentally investigates blanking/piercing operations of explosively welded commercial DP600 advanced steel sheets, Al1100 aluminium sheets, and DP600-Al1100 composite plates, in which punches with different tip shapes are used. The experimental studies included several methods, such as explosive welding, punching, tensile testing, and macro image analyses using digital, optical, and SEM microscopes. The theoretical studies comprised finite element modelling using 3D models. The explosive weld was successfully applied, and the obtained Fe-Al weld microstructure was evaluated. A total of five punches, which have different tip shapes -flat-ended (0??), angled (16??), concave (R1 and R2), and V-shaped (V16) tips -were used in the experiments. Blanking forces were obtained using a load cell mounted to the die, a data acquisition card, an amplifier, and computer software. The simulation and the experimental study results were in agreement and clearly showed the effects of the punch shear angle and shape on the forces required for blanking/piercing.
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    Investigation of A New Type of Aluminum-Magnesium Alloy with Bismuth Additions Subjected to Thermomechanical Heat Treatment
    (Springer Int Publ Ag, 2024) Kilinc, Medine; Elen, Levent; Ahlatci, Hayrettin; Sun, Yavuz; Tueren, Yunus; Acarer, Mustafa
    In this study, the changes in microstructure, hardness, corrosion and wear properties of Al-Mg with 3% Mg content and new type Al-Mg-Bi alloys with 1.3% Bi addition were investigated with the application of thermomechanical process on the aging heat treatment characteristics. As a result of the applied thermomechanical process, a finer grained structure was obtained and a higher hardness value was achieved compared to the casting alloys. Bright phases in SEM micrographs were detected as (rod-shaped) intermetallic (Al6Mn) particles in TEM analyses. Additionally, it was determined that the independent dark particles in the Al matrix were Mg2Si phases. Both alloys showed evidence of the Al3Mg2 phase. However, corrosion tests have shown that the Al-Mg-Bi1.3 alloys with the addition of bismuth have higher corrosion resistance than the Al-Mg alloys. The Al-Mg-Bi1.3 alloys also exhibited improved wear resistance in dry and corrosive wear tests. While the wear of the investigated alloys in a dry environment is associated with an improvement in hardness, wear resistance in corrosive media is improved by the addition of Bi, which reduces the formation of certain phases.
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    An investigation of mechanical and metallurgical properties of explosive welded aluminum-dual phase steel
    (Elsevier, 2008) Acarer, Mustafa; Demir, Bilge
    The aim of this paper is investigation of microstructure and property relationship in aluminum-HSLA steel and aluminum-dual phase steel bimetals fabricated by explosive welding technique. Dual phase steel was produced by intercritical annealing and water quenching from 1.45Mn-0.2Si-0.186C HSLA steel. Hardness. tensile shear strength. tensile strength, toughness and microstructure of explosively welded aluminum-HSLA steel and aluminum-dual phase steel were evaluated. Both bimetals have a straight bonding interface. It was also seen that plastic deformation of dual phase steel was higher than HSLA steel near interfaces of bimetals. The hardness was increased near the bond interface of bimetals. Tensile and tensile shear strength tests showed that aluminum-dual phase steel is superior than aluminum-HSLA steel. Also, impact toughness of aluminum-dual phase steel was found significantly higher than that of aluminum-HSLA steel. (C) 2008 Elsevier B.V. All rights reserved.
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    An investigation of the shearing performance and sheared surface characterisation of ultra-strength DP steel-Al explosive welded plate composite
    (Springer London Ltd, 2023) Demir, Bilge; Ali, Khalil Belras; Gurun, Hakan; Acarer, Mustafa
    This study investigated the manufacturability of ultra-strength steel-Al plate composite, the punch-cutting performance of these composites and base materials, and the cutting surface properties. Therefore, experimental studies included explosive welding, punching process, and materials characterisations (microstructure and sheared surface image analyses via SEM, hardness and tensile test). In the punching process, five different types of punches were used. Additionally, the load cell was mounted on the punch and connected to the computer by an amplifier and a data acquisition card; the force values corresponding to the processing times were directly monitored, and the data were obtained. Shear process analyses were performed using finite elements. Microstructure and mechanical test results show that the DP1200 steel-Al 1100 aluminium laminated bimetal composite was produced by explosive welding of acceptable quality. The flat punch showed the highest shearing force, and other punches (angled and concave ends) reduced the shearing forces P R2, P V16, P R1, and P 16, respectively. Punches with different cutting-edge forms reduced the shearing force by up to 75%. The sheared surfaces were investigated in detail. Shearing marks were observed on both sides of the bimetal similarly. The punching process force vs time results showed good agreement between modelling and experimental punching values.
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    Microstructure, mechanical properties, and corrosion resistance of an explosively welded Mg-Al composite
    (Keai Publishing Ltd, 2022) Acarer, Mustafa; Demir, Bilge; Dikici, Burak; Salur, Emin
    In this study, an attempt was made to manufacture an AZ31-Al5005 laminated composite by explosive welding. A mixture of ammonium nitrate (90%), fuel oil (5%), and TNT (5%) was used as the explosive. The detonation velocity of the explosive material was approximately 3100 m.s(-1). The microstructure and mechanical and corrosion properties of the joint were comparatively investigated. Microstructural characterisation of the joint was conducted by optical microscopy (OM), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), high-resolution transmission electron microscopy (HR-TEM), and X-ray diffraction (XRD). The mechanical properties were determined using micro-Vickers hardness, tensile, and Charpy impact tests. In addition, electrochemical tests were conducted on the AZ31-Al5005 laminated composite and the individual components to determine their corrosion resistance. The corrosion behaviours of the structures were determined in a 3.5% NaCl solution at room temperature using potentiodynamic scanning (PDS). The metallurgical structure and mechanical properties of the joints were within the acceptable limits. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.
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