SEARCH RESULT

The iron and steel (I&S) sector plays an active role in the world economy with a market share of an estimated $1,715 billion. As in other sectors, qualified production is a crucial step for international trade for I&S sector. For example; between the years 2013-2015, two major steel-producing countries of Turkey and Germany have reacted differently against the low quality steel sale from China. While the poor quality steel produced by China has no place in the German market, it has played an active role in the Turkish market. From this point of view, the effects of the accredited laboratories on the sectors they serve were examined by means of the iron and steel industry. The trend of the accredited laboratories in Turkey serving the iron and steel industry has been investigated in detail. In addition, the results were compared with Germany.

International Iron & Steel Symposium
UDCS

Betul ERCAN Yasin Akgül Alper Incesu Muzeyyen ABUNAZ Bulent AYDEMIR Murat KAVRUK

Reference materials (RMs) are one of the basic materials used by the laboratories to prove the reliability of their test results. In this research, preliminary studies have been carried out to develop reference materials (RMs) according to ISO 6892-1 tensile testing standard. For this purpose, EN 10130:2006 quality 1 mm thin sheet steel was prepared as appropriate to standard. Homogeneity tests and inter-laboratory comparison tests were performed. Results of these tests and reproducibility criteria that specified in ISO 6892-1 were evaluated to understand the qualification of the produced RMs. It was considered that samples can be accepted as RMs with the application to IAF member organizations.

International Iron & Steel Symposium
UDCS

Betul ERCAN Alper Incesu Engin ÇEVİK Yasin Akgül

In this study, it was investigated whether there was a correlation between the production of steel and the number of accredited laboratories of countries. For this purpose, the metallic material competence (MMC) coefficients of countries were calculated. According to the results, Germany, known as a quality steel producer, was the country with the highest coefficient. Moreover, Germany's made in country index has the best value in other countries. However, China, which is the market leader in steel production, was a country with the lowest MMC coefficient among the compared 10 countries. It was foreseen that countries should focus on non-destructive tests in order to become quality steel producers. This study for the iron and steel industry was thought to be a guide for other sectors.

International Iron & Steel Symposium
UDCS

Alper Incesu Yasin Akgül Betul ERCAN Muzeyyen ABUNAZ Bulent AYDEMIR Murat KAVRUK

In this study, effect of straightening process on mechanical properties of pre-strain pearlitic steels was investigated. The material employed in this study has 0,83 % Carbon content. Tensile test, Vickers hardness test and Wear tests under load of 10N and 20N were performed for samples (straightened and non-straightened) to determine mechanical properties. Also, Scanning Electron Microscope (SEM) was used for microstructure characterization. Tensile test results revealed that yield strength and tensile strength increased with straightening process.

International Iron & Steel Symposium
UDCS

Alper Incesu Yasin Akgül Muhammet Emre Turan Ahmet GULLU Gurmak Çelik

Evaluation of the performance of the laboratories for specific tests and monitoring laboratory performance, laboratories need to participate interlaboratory comparisons. As a means of quality assurance such an external quality control studies have an importance for laboratory accreditation. In this study, charpy impact test samples were prepared related to ISO 148-1 from S275JR quality steel and randomly sent to participant laboratories. Each samples were tested according to ISO 148-1: Charpy pendulum impact test standard in metallic materials at room temperature by each participant. Test results of laboratories were collected and performance of laboratories were determined by statistical method offered by ISO 13528:2015 standard.

International Iron & Steel Symposium
UDCS

Betül USTA Alper Incesu

The accuracy and reliability of the tests and analyses applied by the laboratories are audited and recorded in accordance with ISO 17025 standard. The proficiency test stipulated by the standard are also an indication of how well the applied laboratory method has been applied by the laboratory concerned. In this study, calculations and the results of calculations related to the performance evaluations for proficiency test organized with the participation of different laboratories in accordance with ISO 6892-1: Tensile Test Standard in Metallic Materials at Room Temperature. The Zscores of the laboratories were calculated as a result of deviations from the test machine and the expert, regardless of the similar feature specimens of reinforcing steel sent to all participants.

International Iron & Steel Symposium
UDCS

Alper Incesu Betül USTA

Commercial material producers should accurately know their products performances in service conditions. Test and analyze techniques are very important instruments to understand mechanical, chemical, physical etc. properties of the products. However during the application of these test and analyses some parameters affect the accuracy of results. Calculation of measurement uncertainty is important to put a tolerance value to the results of test and analyses related to these parameters. During the calculation of measurement uncertainty man (personal), machine, material etc. parameters should be clearly and objectively defined and uncertainty that comes from these parameters should be put on to the total uncertainty calculation. In this study, measurement uncertainty for Charpy impact test at room temperature related to EN ISO 148-1 of commercial S275JR quality steel is used at building applications as plate like flat materials was calculated. Parameters that effects the uncertainty calculations were clearly defined and results were reported related to these parameters.

International Iron & Steel Symposium
UDCS

Alper Incesu Betül USTA

Aluminium alloys have wide spread application areas from foil to wheel and also aluminium alloys have been the primary material of choice for structural components of aircraft since about 1930’s [1]. AlSi8Cu3Fe is the most popular and common choice for die casting. AlSi8Cu3Fe is known for offering an ideal combination efficient material properties and production workability. In addition, this material is commonly used by industrial applications throughout the World. It is suitable for large, intricate and thin walled castings in all types of moulds, also used where corrosion resistance or ductility is required. AlSi8Cu3Fe, being a hypoeutectic alloy close to Al– Si eutectic composition [2]. The microstructure of this cast alloy is composed of primary - aluminium dendrites and eutectic islands (acicular Si crystals in aluminium) [2].

International Symposium on Light Alloys and Composite Materials
UHAKS

Ebru Baser Alper Incesu Sedef Şişmanoğlu Ali Gungor

In recent year’s aluminum, magnesium and similar materials that have the high specific strength (strength/density) have become the focus of attention by the aviation and automotive industries where weight gain is important [1-3]. The weight gain in these areas will reduce fuel consumption and therefore also reduce greenhouse gasses (GHGs) emissions. It is important to improve the mechanical properties of these materials in order to increase their use. Alloying, thermo-mechanical processes, heat treatments etc. are among the methods that can be applied to develop these properties. One of the most preferred elements in the alloying of aluminum metal is silicon. Due to the high fluidity provided by the silicon, it is possible to produce parts with complex and thin sections by casting. Silicon provides fluidity to the liquid metal while also reducing the tendency to tear on the spattered part [4]. Copper can be used up to 5% as an alloying element when high strength values are required but corrosion resistance is not very important [4]. Iron, which forms intermetallic compounds with aluminum that are highly stable but have brittle nature which, negatively affects the ductility of the part and also reduces the corrosion resistance [4]. To get rid of these harmful effects that iron creates, some manganese or cobalt is added to the alloy. After alloying, T6 heat treatment applied for the development of mechanical properties is one of the most common methods. T6 heat treatment explains as artificial aging is applied after the sample is subjected to heat treatment [4]. In this study, attempts have been made to determine wear behavior of T6 heat treatment applied to commercially produced AlSi8Cu3Fe (ETIAL-160) aluminum alloy.

International Symposium on Light Alloys and Composite Materials
UHAKS

Ebru Baser Alper Incesu Sedef Şişmanoğlu Ali Gungor

In this study, carbon fiber reinforced epoxy matrix composites were produced as an alternative material to weight gain for high speed train outer panel coatings. Carbon prepreg were used to manufacture directional composite materials composed of 7 layers by vacuum bagging method. Curing process was done at three different pressures (16" = 0.53 atm, 20" = 0.67 atm and 27" = 0.9 atm) and two different curing duration (160 min and 200 min) at 170 º C constant temperatures. Fabric orientation was 0º and 45° alternating layers in directional composites. Deflection measurement, tensile test, 3-point bend test and SEM analyses were performed to analyze the composite materials. Deflection in directional composites were increased with increasing curing pressure but were decreased with increasing curing duration. Also, it was observed that tensile strength, elastic modulus and bending strength of carbon fiber reinforced epoxy matrix composites increased with increasing curing duration and pressure. Finally, the scanning electron microscope images showed that the carbon fibers in the bundle were tightly bound to the epoxy matrix and showed brittle behavior during fracture.

International Symposium on Railway System Engineering
ISERSE

Ali Gungor Alper Incesu Mustafa Yunus Askin

In this present work, the effect of microstructure on the corrosion behavior of magnesium alloys varying with Ca/Al ratio was investigated. Three different alloys with three different Ca/Al ratio 0.58, 0.79, and 0.91 were studied. All three alloys had approximately same Mn content. Microstructure and phase identification of the alloys were carried out by SEM, EDX and XRD analyses. Alloy 1 contains a-Mg, Al2Ca phases and Alloy 2 and Alloy 3 contain Mg2Ca in addition to a-Mg and Al2Ca phases. The amount, size and distribution of secondary phases were strongly dependent on Ca/Al ratio. Although it has been observed that the corrosion current densities of three alloys are very close to each other, alloy 1 had lower value corrosion rate than the other alloys. Thus, it can be said that the alloy 1 is more resistant to corrosion in 3.5% NaCl solution.

International Conference of Advanced Materials and Manufacturing Technologies
ICAMT

Ali Gungor Hamid Ali ELAMAMI Alper Incesu