13 results listed
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
Resiudal stress has a vital importance for evaluation
of mechanical properties of steel products. It can be formed
during cooling stage and hot rolling processes which are
indispensable for iron&steel industry. In this study, heat
treatment was applied to st 37 steel, which is widely used for
construction applications, at 1100 ℃. Then, st 37 was hot rolled
with using 14 pass at 1000 ℃. Microstructure of samples were
characterized before and after rolling process using Optical
Microscope. Residual stress was measured by cutting method.
Also, hardness values of samples were compared.
International Iron & Steel Symposium
UDCS
Neslihan Akgül
Yasin Akgül
Muhammet Emre Turan
Carbon steels have a wide range of applications such as
construction, machine components (shafts, bolts etc.) and
transportation. Corrosion is one of the important reason for the
failure of these materials. In this study, the corrosion behavior of
hot-rolled carbon steel against dimethylformamide (DMF) was
investigated. Also, the corrosion resistance of the sample was
compared to untreated carbon steel and heat treated carbon
steel. Stress relieving heat treatment was applied at 550 ℃ for 90
minutes. Electrochemical corrosion tests were performed for all
samples. In addition, while the chemical composition of the
sample was determined by spectral analysis, microstructure
studies were carried out by an optical microscope.
International Iron & Steel Symposium
UDCS
Yasin Akgül
Hamza Simsir
Hayrettin Ahlatçı
This work can be located to two parts. In the first part,
hydrothermal carbon (HTC) was synthesized from cellulose at
180 ℃ for 20 hours. In the second part, HTCs reinforced iron
matrix composites were fabricated via powder metallurgy. For
this fabrication process, HTCs and iron powders were mixed by
turbula mixer for one hour. Then, obtained mixtures of powders
were compacted by press machine at 700 Mpa. After that, green
billets were sintered at 1100 ℃ for one hour. Microstructures of
samples were characterized by Scanning Electron Microscope
(SEM). Density measurement was applied according to
Archimedes method. Hardness and compression tests were
conducted to determine mechanical properties of samples.
International Iron & Steel Symposium
UDCS
Hamza Simsir
Yasin Akgül
Mehmet Akif Erden
Powder metallurgy method is production of parts widely used today. This use is widely used in many areas of the
steel materials industry, especially from powder metal parts produced by powder metallurgy method. Since these materials take the
form of the final product at the end of production without requiring any machining process. Also, these materials can be used as an
iron based bearing material because of the machine parts such as filter, cutting tool bits and they have self-lubricating property due
to its porosity. The aim of this study is; stainless steel matrix, boron carbide reinforcement in different ratios (5%, 10%, 15%)
is the production of functional graded material. For this reason, stainless steel and boron carbide powders were mixed in V-type
mixer for 3 hours. After this process, the samples were produced by means of powder metallurgy under pressure of 45 MPa at 900°C
in the hot press machine. The microstructure and boron carbide distribution of the produced samples were examined in the
SEM device and hardness measurements were made in order to observe the changes in mechanical properties. When
microstructures were examined, it was determined that boron carbides were distributed homogeneously. It was observed that the
hardness increased as the rate of support and the transition between the stages increased.
International Iron & Steel Symposium
UDCS
Batuhan Özusta
Yasin Akgül
Hayrettin Ahlatçı
Süleyman Yaşın
İsmail Esen
Yavuz Sun
Yunus Türen
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, Fe matrix composites with different
amounts of graphene nanoplatelets (0.2-0.5-0.8 wt%) were
produced via powder metallurgy. Tribological behaviors of
samples were determined with a dry sliding wear test. Results
were compared with Fe-Graphite (C) composites.
Microstructures of samples were investigated by the optical
microscope. Vickers hardness and density measurement were
performed for all samples. Also, worn surfaces of samples were
observed with a Scanning Electron Microscope (SEM). Results
show that all graphene nanoplatelets (GNPs) containing samples
showed better wear resistance behavior compared to graphite
containing samples. However, the same trend was not observed
according to hardness test results. 0.8 wt% graphite-Fe sample
has a higher hardness value than 0.8 wt% (GNPs)-Fe sample.
International Iron & Steel Symposium
UDCS
Salih BEKTAS
Mehmet Akif Erden
Ahmet Nusret Tanrıverdi
Yasin Akgül
In this study, head hardening process was applied for R260 quality rails. Microstructures of rails were carried
out using Scanning Electron Microscope (SEM). Hardness distribution of head parts were also evaluated for
two category samples (heat treatment and non heat treatment). Wear tests were performed under three
different loads (10N, 20N and 40N) in both %3.5NaCI solution and dry conditions. Worn surfaces were
characterized by Nikon Shuttlepix, Profile projector and SEM. Results clearly show that, head hardened
rails exhibited better wear performance especially under load of 10N in dry conditions.
International Iron & Steel Symposium
UDCS
M. Emre TURAN
Fazil Hüsem
Yasin Akgül
Yavuz Sun
Hayrettin Ahlatçı
In this study, effect of boron nitride particles on the mechanical properties of aluminum composites
reinforced with BN particles was investigated. Experimental procedure was started with mixturing of
powders in the turbula mixer. Hot press was applied at 550 C in argon atmosphere. For characterization of
microstructure, scanning electron microscope (SEM) analysis was done. Compression test was applied for
determination of strength. Vickers hardness was used to measure hardness of samples.
International Iron & Steel Symposium
UDCS
Yasin Akgül
Yuksel Akinay
Fazil Hüsem
Hamza Simsir
Safa POLAT
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
Aim of this study is to investigate effect of titanium carbide nanoparticle contents on the mechanical
properties of the Aluminum/TiC composites. Aluminum and titanium carbide nanoparticles were mixtured
in the turbula mixer. After mixture process, samples were produced using Hot Press in argon atmosphere.
Scanning Electron Microscope (SEM) and X-ray diffraction were used for characterization. Compression
test was performed for determination of strength and also vickers hardness tests were carried out to
understand mechanical effects of TiC particles on pure aluminum.
International Iron & Steel Symposium
UDCS
Yasin Akgül
MUHAMMET EMRE TURAN
Yuksel Akinay
In this study, effects of heat treatment on microstructure and structural properties of NiTi alloy were
investigated. In this sence, the depence of shape memory behavior of NiTi alloy was examined by changes
of heat treatment temperature and cooling conditions. Two group of specimens were used. One group was
deformed by 50% and the other group was deformed 75%. Heat treatment temperatures were chosen 5000C
and 600 0C. All specimens were cooled both in air and water to investigate the influence of cooling
conditions. Microstructures were examined using Scanning Electron Microscope (SEM). Also DSC and
XRD analysis were carried out for thermal and structural characterization.
International Iron & Steel Symposium
UDCS
Yuksel Akinay
Fatma MEYDANERİ TEZEL
Yasin Akgül