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Öğe Impact toughness and microstructure of continuous steel wire-reinforced cast iron composite(ELSEVIER SCIENCE SA, 2009) Akdemir, Ahmet; Kus, Recai; Simsir, MehmetIn this study, improvement of impact toughness of gray cast iron by reinforcing steel fiber was investigated. The composite material was produced by sand mould casting technique. Then, normalizing heat treatment was applied to the specimens at various temperatures (800 degrees C, 850 degrees C, and 900 degrees C). Charpy impact toughness tests were conducted at the temperature of -80 degrees C, 0 degrees C, and 27 degrees C. The results show that impact toughness of the gray cast iron is increased by reinforcing low carbon steel wire. As the test temperature is decreased, impact toughness of the composite specimens decreases considerably. It is noted that graphite free transition regions with high hardness were observed due to the carbon diffusion from cast iron to steel fiber. It is considered that interphase (fine pearlitic phase without graphite flakes) and bond quality in transition region contribute to increase in impact toughness of the cast iron composites. (C) 2009 Elsevier B.V. All rights reserved.Öğe Investigation of the tensile properties of continuous steel wire-reinforced gray cast iron composite(ELSEVIER SCIENCE SA, 2011) Akdemir, Ahmet; Kus, Recai; Simsir, MehmetThe aim of the present study was to improve the tensile properties of gray cast iron by reinforcing the material with a steel wire. The composite was produced by sand mold casting, and the specimens were normalized by applying heat treatments at 800 degrees C, 850 degrees C, and 900 degrees C. Tension tests were conducted on gray cast iron and composite specimens, and the microstructure of the specimens was examined with an optical microscope. The fracture surface of the tension test specimens was examined with a scanning electron microscope (SEM), and graphite-free transition regions with high degrees of hardness were observed due to the diffusion of carbon from the cast iron to the steel wire. The microstructure of the transition region (fine pearlitic phase with partially dissolved graphite flakes) and the bond quality in the transition region increased the tensile properties of cast iron composites. Also, it is concluded that the tensile properties of gray cast iron increased with an increase in the normalization temperature. (C) 2011 Elsevier B.V. All rights reserved.Öğe Mechanical and microstructural properties of low-carbon steel-plate-reinforced gray cast iron(ELSEVIER SCIENCE SA, 2009) Avci, Ahmet; Ilkaya, Nevzat; Simsir, Mehmet; Akdemir, AhmetIn the present experimental study, strengthening of gray cast iron by reinforcing with steel plates was investigated in the as-cast and normalized conditions. Normalizing heat treatments were applied to the specimens at temperatures of 800 degrees C and 850 degrees C. Three-point bend specimens were manufactured from gray cast iron and also from gray cast iron with reinforced steel plates. Flexural strengths of the steel-plate-reinforced cast iron were calculated for four distinct volume fractions (V-r = 0.04, 0.08, 0.12, and 0.16). The current study shows that the steel-plate-rein forced gray cast iron has higher flexural strength and flexural modulus than the cast iron without reinforcement. The flexural strength considerably increases with slight increase in normalization temperature. Optical and scanning electron microscopy analyses were used to examine flake morphology and microstructures of gray cast iron and steel-plate-reinforced gray cast iron. it is noted that carbon diffuses from the gray cast iron to the steel plates. A transition region containing partially dissolved graphite and having high hardness was observed due to the carbon diffusion. (C) 2008 Elsevier B.V. All rights reserved
