Konca, Erkan

Profile Picture
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
23190
Google Scholar ID
ydtBXNkAAAAJ
WoS Researcher ID
N-6390-2017

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

25

Citations

880

h-index

18

Go to Scopus profile
Documents

23

Citations

771

Go to WoS profile
Scholarly Output

23

Articles

10

Views / Downloads

25/0

Supervised MSc Theses

6

Supervised PhD Theses

3

WoS Citation Count

112

Scopus Citation Count

111

Patents

0

Projects

0

WoS Citations per Publication

4.87

Scopus Citations per Publication

4.83

Open Access Source

5

Supervised Theses

9

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

Competency Cloud

GCRIS Competency Cloud

Filters

2012 - 201992020 - 20244
Reset filters

Settings

Start date: 2010Has files: false

Scholarly Output Search Results

Now showing 1 - 10 of 13
  • Thumbnail Image
    Conference Object
    Effect of Electroplating Parameters on "her" Current Density in Ni-Mos2 Composite Plating
    (Minerals, Metals and Materials Society, 2012) Güler,E.S.; Karakaya,I.; Konca,E.; Saraloǧlu Güler, Ebru
    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 electroplating parameters and their interaction effects on the peak current density for HER were studied by fractional factorial design. The parameters and their ranges were; MoS2 concentration (0-30 g/l), temperature (30-50°C), pH (2-4) and surfactants (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 currents (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 0 to 2.5 V. The peak current densities (ip) for each experimental route were determined by fractional factorial design for three types of mineral processing surfactants; sodiumlignosulfonate (SLS), depramin-C (DC) and ammoniumlignosulfonate (ALS) using Minitab program [1]. Adding MoS2, decreasing temperature and increasing pH has decreasing effect on peak current density for all surfactants. ALS and DC have increasing effect whereas SLS has descending effect on peak current.
  • Thumbnail Image
    Conference Object
    Effect of Electroplating Parameters on "her" Current Density in Ni-mos2 Composite Plating
    (Minerals, Metals & Materials Soc, 2012) Guler, Ebru Saraloglu; Karakaya, Ishak; Konca, Erkan
    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 electroplating parameters and their interaction effects on the peak current density for HER were studied by fractional factorial design. The parameters and their ranges were; MoS2 concentration (0-30 g/l), temperature (30-50 degrees C), pH (2-4) and surfactants (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 currents (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 0 to 2.5 V. The peak current densities (i(p)) for each experimental route were determined by fractional factorial design for three types of mineral processing surfactants; sodiumlignosulfonate (SLS), depramin-C (DC) and ammoniumlignosulfonate (ALS) using Minitab program [1]. Adding MoS2, decreasing temperature and increasing pH has decreasing effect on peak current density for all surfactants. ALS and DC have increasing effect whereas SLS has descending effect on peak current.
  • Thumbnail Image
    Article
    Production of 20 Mm Thick Api Psl 2 X60 and X70 Grade Plates From a Nb-Ti Microalloyed Steel
    (2020) 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.
  • Thumbnail Image
    Book Part
    Effect of Electroplating Parameters on Internal Stress in Ni-M0s2 Composite Plating
    (Wiley Blackwell, 2013) Güler,E.S.; Konca,E.; Karakaya,I.
    [No abstract available]
  • Thumbnail Image
    Article
    Citation - WoS: 18
    Investigation of the Tribological Behaviour of Electrocodeposited Ni-mos2 Composite Coatings
    (inderscience Enterprises Ltd, 2017) Guler, Ebru Saraloglu; Konca, Erkan; Karakaya, Ishak
    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 mu m), pH (2, 3 and 4), current density (3.8, 4.8 and 5.8 A/dm(2)) 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.
  • Thumbnail Image
    Article
    Citation - WoS: 23
    Citation - Scopus: 27
    Effect of Electrodeposition Parameters on the Current Density of Hydrogen Evolution Reaction in Ni and Ni-mos2 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.
  • Thumbnail Image
    Master Thesis
    Su Verme ve Yaşlandırma Koşullarının 2024 Al Alaşımının Sertleşme Davranışı Üzerindeki Etkileri
    (2024) Yücel, İrem; Konca, Erkan
    AA2024 alüminyum alaşımı, düşük yoğunluğu, yüksek mukavemeti, yüksek şekillendirilebilirliği ve iyi yorulma direnci sayesinde uzay ve havacılık endüstrisinde yaygın olarak kullanılan bir yaşlandırma sertleşmesi alaşımdır. Yaşlandırma sertleşmesi, çözelti haline getirme, suverme ve yaşlandırma adımlarından oluşan üç aşamalı bir süreçtir. Bu projede, suverme ve yaşlandırma koşullarının 2024 Al alaşımının doğal yaşlanma sertleşmesi davranışı üzerindeki etkilerinin incelenmesi amaçlanmıştır. Su verme ortamı (saf su, ayçiçek yağı, tuz, şeker, metanol ve glikolün sulu çözeltileri) ve su verme sıcaklığı (-30°C, 0°C, 20°C ve 85°C) değiştirilerek çeşitli suverme koşulları oluşturulmuştur. Yukarı suverme (ani ısıtıp soğutma) deneyleri, oda sıcaklığında yaşlandırılan 2024 Al alaşımı numunelerin çok kısa süreyle (20-60 s) yüksek sıcaklığa (170°C) maruz bırakılmalarıyla gerçekleştirilmiştir. Saf ve tuzlu su dışında kalan suverme ortamlarının, zayıf ısı transfer kabiliyetleri nedeniyle 2024 Al alaşımının suverme sırasında sertleşmesini engelleyemediği ve bunun da suverilmiş halde yüksek sertlik değerlerine yol açtığı tespit edilmiştir. Yukarı suverme deneylerinin sonuçları bu yöntemin 2024 Al alaşımının hızlandırılmış sertleşmesi için çok etkili olduğunu göstermiştir. Katı çözelti içinde alaşım elementleri bakımından zengin kümelerin oluşumunun yukarı su verilmiş numunelerin sertliklerinde gözlemlenen artışın ardındaki ana mekanizma olduğu düşünülmektedir.
  • Thumbnail Image
    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]
  • Thumbnail Image
    Article
    Citation - WoS: 10
    Citation - Scopus: 20
    A Comparison of the Ballistic Performances of Various Microstructures in Mil-A Armor Steel
    (Mdpi, 2020) 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.
  • Thumbnail Image
    Article
    ÖSTENİTLEME SICAKLIĞININ EN-GJS-600-3 KÜRESEL GRAFİTLİ DÖKME DEMİRİN ÖSTEMPERLENME DAVRANIŞINA ETKİLERİNİN ARAŞTIRILMASI
    (2020) 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.