SEARCH RESULT

—In this study, fatigue strength and microstructural changes of AISI 1040 steel with different heat treatment parameters were investigated. 1040 steel is a material used in many areas today. Some of the material application areas can be subjected to cyclical loads. Fatigue strength, such as abrasion and tensile strength, is also very important in these materials. AISI 1040 steel can be easily heat- treated to increase strength. The samples were incubated at 920 ° C for 4 hours and controlled cooling in air, oil, water and oven. The microstructures of the samples after heat treatment were examined by optical microscope. Vickers hardness was performed for all samples. Force controlled fatigue test was performed. Broken surface images of fractured specimens were taken on Nikon ShuttlePix device during the test. The hardness of the water cooled sample was better than other heat treatment samples. It was observed that the increase in fatigue strength as a result of the hardness and pulling points increased.

International Iron & Steel Symposium
UDCS

Salih Bektaş Fazil Hüsem

In this project, Al alloys with Al-10Sn-xSi (x = 2, 4, 6) composition will be melted in the graphite furnace by using a vacuum melting furnace, and melt coke molds will be poured to obtain tensile specimens. A portion of the specimen will then be annealed at 400 °C for 1.5 hours in the annealing furnace. For both non- tempering the samples annealed, step sanding, 6, 3, 1-micron particle size diamond suspension and felt the fine polishing, and finally, etching ending sample Material research development from SEM images, EDX analysis will be done. With SEM, surface morphology, composition analysis with EDX, diffraction pattern and crystallographic orientations and crystal parameters, phases formed and distribution of these phases, grain sizes will be examined and their structural properties will be revealed as a result.

International Symposium on Light Alloys and Composite Materials
UHAKS

Fazil Hüsem Salih Bektaş Fatma MEYDANERİ TEZEL

Sn-Zn based alloys are an alloy group of particular interest as lead-free solder in the electronics industry. Considering the characteristics of solder alloys, they are producible, their reliability and environmental suitability are remarkable; such as melting temperatures, solder ability, flow ability, density, thermal and electrical properties, corrosion and oxidation behavior, surface tension, rework ability and cost. Lead-free solder alloys are also sensitive to environmental and human health and are among the main reasons for preferring these alloys. Sn-Zn solders have a variety of fascinating properties such as low melting temperature at 198 C. In addition, in the metal coating industry, Zn-Sn alloys are now used as protective coatings on ferrous base metals. Low cost Zn-Sn coatings show high corrosion resistance and are seen as promising candidates to replace toxic cadmium and allergenic nickel coatings [1-3]. In this study, it is aimed to form alloys by combining Sn and Zn elements by casting method. Microstructural properties of Sn-50 wt.% Zn and Sn-80 wt.%Zn alloys were examined with SEM, EDX, XRD devices. Average micro hardness values of Sn-[x] wt. % Zn [x=50 and 80] alloys were measured to be 62.1 ve 49.2 (Hv0.05). According to these results, micro hardness values only depend on the composition, and decrease with increasing of Zn composition. Mechanical properties (yield, elongation, elongation) were also obtained by using a tensile tester. The tensile test results for Sn- 50wt.% Zn and Sn-80wt.%Zn indicating that the sample with the best mechanical properties is Sn-50wt.% Zn. In addition, the tensile value obtained for the Sn-50wt.% Zn sample is 78.26 MPa, the unit strain is 5.8% and the yield stress is 53.76 MPa. Also, the corrosion behavior of Sn-50 wt.% Zn and Sn-80 wt.%Zn alloys was determined by applying the mass loss corrosion test. According to the corrosion tests, the corrosion curves were given in Fig. 2

International Symposium on Light Alloys and Composite Materials
UHAKS

Fazil Hüsem Fatma MEYDANERİ TEZEL Salih Bektaş

Pb and Pb-containing compounds are prohibited to use in European Union, because of damaging the environment and human health. Limitation of lead used in the industry for more appropriate development policies to protect the environment is emphasized by most countries. In this context, great efforts for the development of lead-free alternative alloys instead of Pb-Sn eutectic solder alloy is shown [1-2]. Both economically and in terms of other physical and chemical requirements of lead-free solder alloy is required to meet. Sn-Zn eutectic alloy of lead-free solder alloy as prominently provides electronic merge without any modification and is expected to be one of the best alternatives to maintain the existing production line [3-4]. In addition, both micromechanical and metallurgical properties in terms of controlling the microstructure, strength, a casting alloy is complex in terms of silence and ductility. Thermal variables and their impact on the microstructure morphology depending on the heat transfer solidification conditions are influenced by the temperature and composition and are affected all the features as a direct result [5-7]. In this study, Sn-1wt.% Zn, Sn-9wt.% Zn and Sn-14wt.% Zn alloys were cast into the kokil mold. Structural, surface and composition analyses of the obtained alloys were obtained by using SEM, EDX, XRD devices. The variation of Zn amount has a great impact on the grain size, and flake or needle shape distributions of Zn phase in Sn matrix result in different effects on hardness. Also, the microstructures changed from tetragonal solid solution phase to before monoclinic and orthorhombic solution phase and then hexagonal phase. Mechanical properties (yield, elongation, elongation and breakage) were also obtained by using a tensile tester. The tensile test results for Sn-1wt.% Zn, Sn-9wt.% Zn and Sn-14wt. indicating that the sample with the best mechanical properties is Sn-9wt.% Zn. In addition, the tensile value obtained for the Sn-9wt.% Zn sample is 105.8 MPa, the unit strain is 12.8% and the yield stress is 85.548 MPa. Average micro hardness values of Sn-[x] wt. % Zn [x=1, 9, 14] alloys were given Table 1 According to these results, micro hardness values only depend on the composition, and increase with increasing of Zn composition.

International Symposium on Light Alloys and Composite Materials
UHAKS

Fazil Hüsem Ceyda Albayrak Furkan Nergiz Fatma MEYDANERİ TEZEL Umur Can Hamutoğlu Salih Bektaş