Konca, Erkan

Profile URL
https://hdl.handle.net/20.500.14411/7013
Name Variants
Konca E. K., Erkan K.,Erkan Konca, E. Erkan, Konca E., Konca Konca, E E.,Konca Konca, Erkan Konca,E.
Job Title
Doçent Doktor
Email Address
erkan.konca@atilim.edu.tr
Main Affiliation
Metallurgical and Materials Engineering
Status
Website
ORCID ID
0000-0001-8943-091X
Scopus Author ID
8666228500
Turkish CoHE Profile ID
FE7D0B95A4F961CF
Google Scholar ID
ydtBXNkAAAAJ
WoS Researcher ID
N-6390-2017

Research Topics

Domains
Physical Sciences
Fields
EngineeringMaterials Science
Subfields
Mechanics of MaterialsMaterials ChemistryElectrical and Electronic EngineeringMechanical Engineering
Specific Research Areas
Metal and Thin Film Mechanics
Diamond and Carbon-based Materials Research
Electrodeposition and Electroless Coatings
Tribology and Wear Analysis
Advanced materials and composites

Sustainable Development Goals

NO POVERTY1
NO POVERTY
0
Research Products
ZERO HUNGER2
ZERO HUNGER
0
Research Products
GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
1
Research Products
QUALITY EDUCATION4
QUALITY EDUCATION
0
Research Products
GENDER EQUALITY5
GENDER EQUALITY
0
Research Products
CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
0
Research Products
AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
3
Research Products
DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
REDUCED INEQUALITIES10
REDUCED INEQUALITIES
0
Research Products
SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
0
Research Products
RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
CLIMATE ACTION13
CLIMATE ACTION
0
Research Products
LIFE BELOW WATER14
LIFE BELOW WATER
0
Research Products
LIFE ON LAND15
LIFE ON LAND
0
Research Products
PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
PARTNERSHIPS FOR THE GOALS17
PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents

28

Citations

891

h-index

18

Go to Scopus profile
Documents

23

Citations

780

Go to WoS profile

Publication Collaboration

Affiliation Name Count
General Motors (United States) 11
Atilim University 11
University of Windsor 11
Natural Sciences and Engineering Research Council of Canada 7
Middle East Technical University 6
1 / 4
Data obtained from OpenAlex
Scholarly Output

22

Articles

10

Views / Downloads

28/106

Supervised MSc Theses

5

Supervised PhD Theses

3

WoS Citation Count

114

Scopus Citation Count

114

Patents

0

Projects

0

WoS Citations per Publication

5.18

Scopus Citations per Publication

5.18

Open Access Source

5

Supervised Theses

8

JournalCount
Metals2
Hittite Journal of Science and Engineering1
International Journal of Electrochemical Science1
International Journal of Surface Science and Engineering1
Journal of Materials Science1
Current Page: 1 / 3

Scopus Quartile Distribution

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Scholarly Output Search Results

Now showing 1 - 10 of 22
  • Master Thesis
    Çözündürme ve Yaşlandırma Koşullarının Döküm Fe-Mn-Al-C-Si Hafif Çeliğinin Sertlik, İçyapı ve Aşınma Direncine Etkileri
    (2025) Köseoğlu, Fatih; Konca, Erkan
    Bu çalışma, çözündürme ve yaşlandırma ısıl işlemlerinin östenit matrisli deneysel döküm Fe-Mn-Al-C-Si hafif çeliğinin mekanik özellikleri ve içyapısı üzerine etkilerini incelemeyi amaçlamıştır. Hedeflenen kompozisyonda ve 6,60 g/cm³ yoğunluğunda dökümler yapılmıştır. Çözündürme işlemleri 950°C-1150°C arasında 2, 4 ve 16 saat uygulanmış, ardından 400°C ile 700°C arasında 4, 16 ve 64 saat yaşlandırma işlemleri gerçekleştirilmiştir. Isıl işlemlerin etkilerini değerlendirmek amacıyla makro/nano sertlik ölçümleri, optik mikroskopi, enerji saçılım spektroskopisi ve elektron geri saçılma kırınımı ile donatılmış elektron mikroskobu, x-ışını kırınım analizleri ve aşınma testleri yapılmıştır. Elde edilen verilere göre, yaşlandırma öncesinde 1000°C'de 4 saat süreyle uygulanan çözündürme ısıl işleminin iç yapısal kararlılık ve mekanik özellikler açısından en uygun sonucu verdiği görülmüştür. 400°C–700°C sıcaklık aralığında 16 saat süreyle uygulanan yaşlandırmanın özellikle sertlik artışı açısından en uygun koşul olduğu söylenebilir. Yaşlandırma işlemleri içyapı içerisinde sertlik artışına katkıda bulunan κ-karbürlerin oluşumuyla sonuçlanmıştır. Ancak, yaşlandırmanın çok uzun süreyle yapılması mekanik özellikleri olumsuz etkilemesi nedeniyle istenmeyen tane sınırı çökeltilerinin oluşumuna yol açmıştır.
  • Article
    Citation - WoS: 10
    Citation - Scopus: 20
    A Comparison of the Ballistic Performances of Various Microstructures in Mil-A Armor Steel
    (Mdpi, 2020-03-28) Konca, Erkan
    Due to their advantageous properties, there is a growing interest in developing armor steels containing fully or partially bainitic microstructures. In this study, bainitic and martensitic microstructures were obtained in rolled homogeneous armor (RHA) steel samples and their ballistic protection performances were investigated. RHA (MIL-A-12560) steel samples were subjected to isothermal heat treatments at three different temperatures, where one temperature (360 degrees C) was above the martensite formation start (Ms) temperature of 336 degrees C while the other two (320 degrees C and 270 degrees C) were below. For the assessment of the ballistic protection performance, the kinetic energy losses of the 12.7 mm bullets fired at the test samples were determined. The promising nature of the bainite microstructure was confirmed as the sample isothermally treated at 360 degrees C provided approximately 10% higher ballistic protection as compared to the regular RHA sample of tempered martensite microstructure. However, the ballistic performances of the isothermally treated samples decreased as the treatment temperature went below the Ms temperature. Following the ballistic tests, hardness measurements, impact tests at -40 degrees C, and macro- and microstructural examinations of the samples were performed. No correlation was found between the hardness and impact energies of the samples and their ballistic performances.
  • Article
    ÖSTENİTLEME SICAKLIĞININ EN-GJS-600-3 KÜRESEL GRAFİTLİ DÖKME DEMİRİN ÖSTEMPERLENME DAVRANIŞINA ETKİLERİNİN ARAŞTIRILMASI
    (2020-09-03) Konca, Erkan; Tur, K Zım
    Bu çalışmada östenitleme sıcaklığının EN-GJS-600-3 (GGG-60) küresel grafitli dökme demirinöstemperlenme davranışına etkisi araştırılmıştır. Y bloklarına dökülen % 0,5 Cu alaşımlı EN-GJS-600-3küresel grafitli dökme demirden çıkarılan numuneler kullanılarak iki farklı östenitleme sıcaklığı (850 ve950°C) ve iki farklı östemperleme sıcaklığının (290 ve 320°C) dört ayrı kombinasyonunda östemperlemedeneyleri yapılmıştır. Östemperleme deneyleri sonrası numunelerin sertlik ölçümleri, çekme testleri ve içyapı incelemeleri gerçekleştirilmiştir. Her iki östemperleme sıcaklığında da 950°C’de östenitlenmişnumunelerde 850°C’de östenitlenmiş numunelere göre daha yüksek sertlik, akma ve çekme dayanımıdeğerlerine ulaşılmıştır. Bu sonuçlar, 950°C’de yapılan östenitlemenin 850°C’ye göre östenit matris içindehem daha çok karbonun çözünmesini hem de östenitin daha iri taneli olmasını sağlayaraköstemperlenmeye daha elverişli östenit yapısı oluşturabilmesiyle ilişkilendirilmiştir.
  • Article
    Citation - WoS: 24
    Citation - Scopus: 28
    Effect of Electrodeposition Parameters on the Current Density of Hydrogen Evolution Reaction in Ni and Ni-mos<sub>2</Sub> Composite Coatings
    (Esg, 2013) Gueler, E. Saraloglu; Konca, E.; Karakaya, I.; Saralog̀lu Güler, E.; Metallurgical and Materials Engineering
    Nickel composites with co-deposited insoluble, solid lubricant particles such as MoS2 have been reported to reduce friction. It is known that hydrogen evolution reaction (HER), competes with nickel deposition. The influence of the parameters and their interaction effects on the peak current density of HER during the electrodeposition of Ni and Ni-MoS2 composite coatings were studied by fractional factorial design. The parameters and their ranges studied were; MoS2 particle concentration (0-30 g/l), temperature (30-50 degrees C), pH (2-4) and two surfactants, namely; ammoniumlignosulfonate (ALS) and depramin-C (DC) (0-1 g/l). Electrodeposition processes were carried out from a typical Watts bath containing leveler, wetting agent and brightener by using a potentiostat. The peak current densities (i(p)) were extended to higher values and the peaks on linear sweep voltammograms became noticeable by increasing the scan rate from 20 mV/s to 100 mV/s over the range of 0 to 2.5 V. The peak current densities (i(p)) of HER for each experimental route were determined by fractional factorial design for two mineral processing surfactants; ammoniumlignosulfonate (ALS) and depramin-C (DC) using a statistical analysis software named Minitab [1]. Adding MoS2, decreasing temperature and increasing pH had decreasing effects on the peak current density of HER regardless of the surfactant used. On the other hand, the surfactants increased the peak current density.
  • Conference Object
    Citation - Scopus: 1
    Effect of Electroplating Parameters on Internal Stress in Ni-Mos 2 Composite Plating
    (2013) Saraloǧlu Güler,E.; Konca,E.; Karakaya,I.
    [No abstract available]
  • Doctoral Thesis
    Derin Çekme Sınır Oranın, Flanş Bölgesinin Isıtılarak Artırılması için Yöntem Geliştirilmesi
    (2015) Kayhan, Erdem; Kaftanoğlu, Bilgin; Kayhan, Erdem; Kaftanoğlu, Bilgin; Kayhan, Erdem; Kaftanoğlu, Bilgin; Konca, Erkan; Manufacturing Engineering; Airframe and Powerplant Maintenance; Manufacturing Engineering; Airframe and Powerplant Maintenance
    Bu tez çalışmasında geliştirilen yöntem kısaca, sac metal malzemelerin şekillendirilme oranının flanş bölgesinin eş sıcaklık dağılımsız ısıtılarak artırılması olarak açıklanabilir. Sıcaklık artışı malzemenin sünekliğinde belirgin bir yükselmeye ve buna bağlı olarak şekillendirilme kapasitesinin artmasına neden olur. Sıcaklık artışı ayrıca malzemenin akma sınırının düşmesi ile birlikte, uygulama kuvvetlerinde ve basınçlarında azalma meydana gelir. Otomotiv endüstrisinde en yaygın kullanıma sahip olan Yüksek Mukavemet Sac Çelik (AHSS) malzeme DP600 olup, araç ağırlıklarının azalmasını ve çarpışma emniyet faktörünün artmasını sağlamasından dolayı bu tez çalışmasında araştırma malzemesi olarak seçilmiştir. Adı geçen çelik malzemelerin kullanımı malzeme kalınlıklarının ve yakıt sarfiyatının azalmasını sağlar. Yapılan araştırmada geliştirilen yöntemin geçerliliği üç farklı tip malzeme, bunlardan iki tanesi Düşük Alaşımlı Yüksek Mukavemet çeliği (HSLA), diğeri ise IF (Arayersiz Çelikler) çeliği kullanılarak, incelenmiştir. Flanş bölgesinin sıcaklığının 180oC to 300oC değerleri arasında oluşturulduğu deneylerde derin çekme sınır oranında %25.58 kadar artış sağlanmıştır. Kullanılan sıcaklık ılık işlem sıcaklığı seviyesinde olduğundan, şekillendirilme kuvvetlerinde azalma meydana gelmesine rağmen malzemenin özelliklerinde ve dayanımında bir değişim gerçekleşmemektedir.
  • Article
    Effect of Aluminizing on the Oxidation of Inconel 718 and Inconel 738LC Superalloys at 925-1050 °C
    (MDPI, 2025-12-16) Telbakiroglu, Yusuf Burak; Konca, Erkan
    This study was undertaken to investigate the effect of aluminizing on the oxidation of Inconel 718 and Inconel 738LC superalloys. Bare and high-activity chemical vapor deposition (CVD) aluminized Inconel 718 and Inconel 738LC samples were oxidized in air at 925, 1000, and 1050 degrees C for 200 h. Detailed cross-sectional examinations, elemental analyses, mass change measurements, and X-ray diffraction studies were performed. It was observed that the oxidation resistances of both alloys were significantly improved by the Al2O3 scale formed on the NiAl layer that was created on the surfaces of the samples during aluminizing. The beneficial effect of aluminizing was found to be more evident in the case of Inconel 738LC alloy samples which showed lower oxidation rates at all test temperatures. The results have been discussed on the basis of the differences in aluminum contents of the alloys and their effects on diffusion.
  • Article
    Production of 20 Mm Thick Api Psl 2 X60 and X70 Grade Plates From a Nb-Ti Microalloyed Steel
    (2020-06-26) Konca, Erkan
    This study was undertaken to determine the controlled rolling and cooling conditions for the production of 20 mm thick American Petroleum Institute (API) X60 and X70 grade steel plates. Nb-Ti microalloyed steel slabs of 200 mm thickness were rolled at fourdifferent finish rolling temperatures (conventional, 950°C, 850°C and 800°C). In some trials, a water table was employed to provide accelerated cooling just after finish rolling. Mechanical tests (tensile, impact and drop weight tear-DWTT) and microstructural examinations were performed on the samples taken from the trial production plates. Fine grainedand essentially ferritic microstructures with strength values satisfying the minimum yieldstrength requirement of 415 MPa for the API X60 grade were easily obtained in all rollingconditions. However, the minimum yield strength requirement of 485 MPa for the APIX70 grade was reached only when accelerated cooling was applied after finish rolling. Theminimum 85% shear fracture required by the DWTT of the API PSL 2 specification couldbe met when the finish rolling temperature was lowered or when accelerated cooling wasapplied regardless of the finish rolling temperature.
  • Article
    Citation - WoS: 30
    Citation - Scopus: 35
    Effects of Alloying Elements (Mo, Ni, and Cu) on the Austemperability of GGG-60 Ductile Cast Iron
    (Mdpi, 2017-08-22) Konca, Erkan; Tur, Kazim; Koc, Erkin
    The interest in austempered ductile irons (ADI) is continuously increasing due to their various advantageous properties over conventional ductile irons and some steels. This study aimed to determine the roles of alloying elements Ni, Cu, and Mo, on the austemperability of GGG-60 ductile cast iron. Two different sets of GGG-60 (EN-GJS-600-3) samples, one set alloyed with Ni and Cu and the other set alloyed with Mo, Ni, and Cu, were subjected to austempering treatments at 290 degrees C, 320 degrees C, and 350 degrees C. A custom design heat treatment setup, consisting of two units with the top unit (furnace) serving for austenitizing and the 200 L capacity bottom unit (stirred NaNO2-KNO3 salt bath) serving for isothermal treatment, was used for the experiments. It was found that austempering treatment at 290 degrees C increased the hardness of the Ni-Cu alloyed GGG-60 sample by about 44% without causing a loss in its ductility. In the case of the Mo-Ni-Cu alloyed sample, the increase in hardness due to austempering reached to almost 80% at the same temperature while some ductility was lost. Here, the microstructural investigation and mechanical testing results of the austempered samples are presented and the role of alloying elements (Mo, Ni, and Cu) on the austemperability of GGG-60 is discussed.
  • Article
    Citation - Scopus: 20
    Investigation of the Tribological Behaviour of Electrocodeposited Ni-Mos2 Composite Coatings
    (Inderscience Publishers, 2017) Güler,E.S.; Konca,E.; Karakaya,I.
    Composite electroplating of solid lubricants in a metal matrix is an effective way to lower coefficient of friction (COF) and improve wear resistance of surfaces in sliding contact. In this work, Ni-MoS2 composite coatings were deposited on AISI 304 stainless steel substrates by electroplating from Watts bath containing suspended MoS2 particles and their tribological behaviour was studied. The effects of MoS2 particle concentration (5, 10 and 30 g/l), MoS2 particle size (1.440 and 5.156 μm), pH (2, 3 and 4), current density (3.8, 4.8 and 5.8 A/dm2) and the surfactant (sodium lignosulfonate, SLS) concentration (0.3 and 1 g/l) on the tribological behaviour were investigated using a ball-on-disc tribometer at ambient conditions. Lower current density, smaller particle size and higher concentration of MoS2 decreased COF. While increasing the surfactant concentration decreased the COF, its friction lowering effect was much more pronounced at relatively lower concentrations of MoS2 in the electrolyte. Copyright © 2017 Inderscience Enterprises Ltd.