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1
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Mechanical Properties of Boronized AISI 316, AISI 1040, AISI 1045 and AISI 4140 Steels

100%
Calik A., Sahin O., Ucar N.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 3
694-698
EN
In this study, some mechanical properties of borided and unborided four steels were investigated. Boronizing of steels was performed by powder pack method at 1210 K for 4 h. The hardness of borides, boride layer thickness and room temperature tensile properties were measured and it was observed that hardness and tensile properties strongly depend on chemical composition of steels. In addition, the effect of a notch on impact behavior was examined by conducting the Charpy tests on borided and unborided steels. The greatest notch toughness was found for a steel AISI 316 with a microstructure consisting of different C, Ni and Cr chemical composition compared to AISI 1040, 1045 and 4140 steels.
2
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Performance of Boron-Carbide as Radiation Shielding

100%
Kara Ü., Tekin H., Calik A., Akkurt İ.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2B
B-335-B-336
EN
Radiation is widely used many fields, especially in medical science. The shielding is the basic method of protection against unnecessary influence of radiation. One of the tools most commonly used in nuclear medicine is vial pig container. Usually lead is used as shielding material in vial pigs to cover radiation source, such as Tc^{99m} which is the most widely used radiopharmaceutical in nuclear medicine. In this study boron carbide has been tested as an substitute of lead in vial pig. The measurement has been performed with the Geiger-Müller counter and the personal combined radiation detectors.
3
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Boriding of Binary Ni-Ti and Ternary Ni-Ti-Cu Shape Memory Alloys

100%
Ucar N., Turku N., Ozdemir A., Calik A.
|
EN
In this work, the boriding of binary (Ni-Ti) and ternary (Ni-Ti-Cu) shape memory alloys was carried out in a solid medium at 1173 K for 8 h using the powder pack method with Ekabor-Ni powders. Characterization of boride layer formed on the surface of alloys was identified by optical microscopy and scanning electron microscopy. TiB₂, NiB₂ and SiC phases in the boride layer of borided binary (Ni-Ti) and ternary (Ni-Ti-Cu) shape memory alloys was confirmed by X-ray diffraction analysis. The microhardness and thickness of the boride layers were measured. The obtained hardness values show a hardness anomaly due to porosity and structural defects with increase of Cu content, while a decrease in the value of hardness moving from the boride layer to main structure was observed.
4
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Investigation of the Erosive Wear Resistance of Boronized Ash-Blowing Nozzles

100%
Calik A., Ozbakir O., Karakas S., Ucar N.
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EN
In this study, pack boronizing was applied to ash-blowing nozzles manufactured from AISI 1040 steels using Ekabor II powders as the boronizing source at a temperature of 1273 K for a duration of 8 h. Erosive wear tests of boride ash-blowing nozzles were carried out in ash delivery line of thermal reactor under actual working conditions. It was observed that erosive wear resistance of borided ash-blowing nozzles were increased 3 times as a result of the boronizing process. The improved wear resistance of the borided samples can be explained by increased surface hardness and higher work hardening.
5
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Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys

88%
Ucar N., Dogan S., Ozdemir A., Karakas S., Calik A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
524-526
EN
In this work, the boriding of binary Ti-Ni shape memory alloys was carried out in a solid medium at 1173 and 1273 K for 2, 4, and 8 h using the powder pack method with Ekabor-Ni powders. The boride layer was characterized by optical microscopy and scanning electron microscopy. The obtained results show that boride layer thickness increases with the increasing boriding temperature and time. Depending on temperature and boride layer thickness, the diffusion process is thermally activated, with the mean value of the activation energy being close to 67 kJ/mol.
6
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Boriding of Equiatomic Fe-Mn Binary Alloy

88%
Calik A., Gencer Y., Tarakci M., Gunduz K., Gulec A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
449-452
EN
Synthetic equiatomic Fe-Mn binary alloy was prepared under vacuum-argon controlled atmosphere. Fe-Mn alloy samples were boronized using the commercial Ekabor II powder at 900°C, 1000C and 1100C for 3 h. The borided samples were characterized by X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and profilometry. The boride layers were composed of FeB, MnB, MnB_2 and Fe_2B phases for the samples borided at 1000C and 1100C while the sample borided at 900C was composed of only FeB and MnB. The boride layer was well adhered to the substrate with saw-tooth like morphology however some discontinuous band of cracks were observed in the boride layer. The concentration ratio of Fe and Mn were equal along the thickness of the coating though in some areas their ratio interchanged. The boride layer thickness and surface roughness increased with boronizing temperature.
7
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Comparison of Hardness and Wear Behaviour οf Boronized and Carburized AISI 8620 Steels

88%
Calik A., Duzgun A., Ekinci A., Karakas S., Ucar N.
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EN
In this study, the hardness and wear behaviour of carburized and boronized AISI 8620 steels have been studied. The boronizing treatment increased the hardness of AISI 8620 steels from 395 HV_{0.1} to a maximal 1610 HV_{0.1} compared to the carburized steels and also significantly improved its wear behaviour. From obtained results, it can be concluded that boronizing is very effective surface hardening method for improving the wear properties of AISI 8620 steels.
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