Browsing by Author "Civi, C"

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    Quenching and tempering of 51CrV4 (SAE-AISI 6150) steel via medium and low frequency induction
    Civi, C; Yurddaskal, M; Atik, E; Celik, E
    Mechanical and microstructural properties of quenched steel are directly related to tempering time and temperature. In many applications, conventionally quenched and tempered steel is widely used for acquiring high strength and toughness. The present study was carried out to investigate the variation in mechanical properties, observation of diminished energy consumption and evaluation of the microstructural properties in SAE-AISI 6150 steel components by induction heating, compared with those of steel tempered by conventional method. Induction quenched and tempered steel provides a shorter process time, less energy consumption and improved mechanical properties through the inhibition of grain growth. In this study, quenching and tempering processes were carried out on medium and low frequency induction units and by using a conventional electrical resistance furnace for the sake of comparison. It was observed that cementite particles began changing their shape from spherical to fine-grained in the induction tempered samples. The sample tempered by low frequency induction manifests superior mechanical properties and offers a potential advantage for significant cost savings.
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    Reliable Production in Steel Industry and a Case Study: Reliability Analysis of Yield and Tensile Strength of S355JR (EN 10025-2) Steel
    Civi, C; Ercay, H
    Considering the strength and cost factors, steel is the essential material in the machinery and manufacturing sector. In today's condition of technology and accordingly today's designs, especially qualified steels have gained great importance, and their superior mechanical strength and fatigue properties make it necessary to use these steels in close proximity to the entire machinery and manufacturing industry. In this study, reliability, which is a neglected concept in steel production in our country, has been discussed, and the contribution of reliability analyzes in production and design was discussed. As a case study, the reliability of the tensile test of S355JR (EN 10025-2) steel was performed.