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Öğe Investigation of wear behaviours of Al matrix composites reinforced with different B4C rate produced by powder metallurgy method(Elsevier, 2017-09) Çelik, Yahya Hışman; Seçilmiş, KübraIn this study, the effects of wear behaviours of Al matrix composites reinforced with different B4C rate produced by powder metallurgy method were investigated. Al and B4C powders with purity of 99.9% and sizes of 25–44 µm were prepared as pure Al, 4% B4C/Al, 8% B4C/Al, 12% B4C/Al and 16% B4C/Al. After these prepared mixtures were pressed under 350 MPa, they were sintered for 90 min at 580 °C in atmospheric environment. Microhardness and wear tests of the produced samples were carried out. Wear experiments of these composites were performed with specially manufactured test equipment at different application loads (5 N, 10 N and 15 N), different sliding distances (250 m, 500 m, 750 m and 1000 m) and a constant speed of 0.46 m/s. In addition, optical microscope, SEM, EDS analyses were used to determine the microstructural changes in the worn and unworn surface of the manufactured composite materials. The results of experimental studies show that the increasing the B4C reinforced rate in composites with Al matrix has led to increase of the hardness and to reduce of the wear loss.Öğe Investigating the effects of cutting parameters on materials cut in CNC plasma(Taylor & Francis, 2013-10-03) Çelik, Yahya HışmanComplex-profile surfaces, of which measurement precision is not important, are cut serially using CNC plasma. These materials cut using CNC plasma are assembled with different manufacturing techniques. These materials can also operate under high pressure and resistance. In this study, S235JR sheet materials (4, 6, and 8 mm thick), used in pressure vessels, were cut using the CNC plasma cutting machine at different cutting speeds, amperes, and arc voltages. Temperature distribution, thickness of heat-affected zone (HAZ), surface roughness, and hardness were measured from the material cut at these different values. Based on values obtained from measurements, the ideal cutting conditions were identified for the materials exposed to the cutting procedures.
