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  • Küçük Resim
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    FRICTION AND WEAR BEHAVIOUR OF BORIDED AISI 304 STAINLESS STEEL WITH NANO PARTICLE AND MICRO PARTICLE SIZE OF BORIDING AGENTS
    (Scibulcom Ltd, 2014) Gunen, A.; Ulutan, M.; Gok, M. S.; Kurt, B.; Orhan, N.
    In this study, AISI 304 stainless steel was subjected to solid bonding treatment with 10-50 nm particle size Nanoboron and commercially EKabor 3 powders. Processes were carried out at temperatures of 1223 and 1273 K for 2 and 4 h of treatment. Friction and wear behaviour of the samples bonded with different sizes of bonding agents has been examined. Wear experiments were performed by reciprocating a sliding wear test at dry conditions. After the wear tests, wear track area, wear track volume and wear rate were calculated based on the surface of the worn materials. The samples bonded with EKabor 3 and Nanoboron powder showed 5 and 8 times higher wear resistance than non-bonded AISI 304 stainless steel, respectively. Bonded steel samples were characterised by optical microscopy, scanning electron microscopy (SEM), microhardness and X-ray diffraction analyses (XRD). Metallographic studies showed that the boride layers have a flat and smooth morphology both in the AISI 304 steel and the boron powder. The thickness and hardness of the boride layer measured between the ranges of 23-33 mu m in thickness, 1020-1264 HV0.01 for EKabor 3 and 49-67 mu m, 1880-2200 HV0.01 for boron nano-particles, depend on the bonding time and temperature.
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    Öğe
    Friction and wear behaviour of borided AISI 304 stainless steel with nano particle and micro particle size of boriding agents
    (Scibulcom Ltd., 2014) Gunen, A.; Ulutan, M.; Gok, M.S.; Kurt, B.; Orhan, N.
    In this study, AISI 304 stainless steel was subjected to solid boriding treatmentwith 10-50 nm particle size Nanoboron and commercially EKabor 3 powders.Processes were carried out at temperatures of 1223 and 1273 K for 2 and 4 hof treatment. Friction and wear behaviour of the samples borided with differentsizes of boriding agents has been examined. Wear experiments were performedby reciprocating a sliding wear test at dry conditions. After the wear tests, weartrack area, wear track volume and wear rate were calculated based on the surfaceof the worn materials. The samples borided with EKabor 3 and Nanoboronpowder showed 5 and 8 times higher wear resistance than non-borided AISI 304stainless steel, respectively. Borided steel samples were characterised by opticalmicroscopy, scanning electron microscopy (SEM), microhardness and X-ray diffractionanalyses (XRD). Metallographic studies showed that the boride layershave a flat and smooth morphology both in the AISI 304 steel and the boronpowder. The thickness and hardness of the boride layer measured between theranges of 23-33 ?m in thickness, 1020-1264 HV0.01 for EKabor 3 and 49-67 ?m,1880-2200 HV0.01 for boron nano-particles, depend on the boriding time and temperature.
  • Küçük Resim
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    Traces of Defects in the Electronic Structure of Porous Ni-Ti Alloys
    (Journal Mater Sci Technol, 2013) Ozkendir, O. M.; Cengiz, E.; Tirasoglu, E.; Kaya, Mehmet; Karahan, I. H.; Orhan, N.
    The electronic structures of Ni-Ti shape-memory alloy samples were investigated by X-ray absorption fine structure (XAFS) spectroscopy both experimentally and theoretically. In the experimental section, the samples were measured at low temperature to determine the persistent traces of both preheating process and atomic concentration effects on the crystal and electronic structure by X-ray absorption near-edge structure (XANES) spectroscopy. As a second step, the extended-X-ray absorption fine structure (EXAFS) calculations, which are based on different choices of one electron potentials according to Ti coordinations by using the real space multiple scattering method FEFF 8.2 code, were performed. The crystallographic and electronic structures of the porous Ni-Ti alloys were tested at various temperatures ranging from 5 to 1323 K.