SEARCH RESULT

-In this study, Cr, Mn, Fe, Co, Ni and Al elements using vacuum arc Melting production method with high entropy (CrMnFeCoNiAl) alloy (YEA) was produced. Valence Electron Concentration (VEC Value) of the high entropy alloy produced was calculated as 7.67. The dendritic and interdentritic structures of high entropy alloy microstructures were observed. In the SEM mapping studies, it was observed that the distribution of the elements was homogeneous. The hardness value was measured as 46.95 HRA. The results are discussed by comparing.

International Iron & Steel Symposium
UDCS

Yusuf Karaca Cemal ÇARBOĞA Bülent KURT

In this study, different rates of boron at 1635 ºC were added to the 21CrNi5 steel using the induction furnace. The casting process was melted and cooled in air to 40x40 mm thick ceramic ceramic molds heated up to 850 ºC. The obtained 40x40 mm square materials were rolled in 2 passes and deformation was applied at about 200-300%. Parts with a 15x15x10 mm were cut and sanded. The effects of boron on the wear behavior, which were added to the samples under 10 N load test and added at different rates, were examined by optical microscope.

International Iron & Steel Symposium
UDCS

Cemal ÇARBOĞA Bülent KURT Serkan DAL

In this study, different rates of boron at 1635 ºC were added to the AISI 1040 steel using the induction furnace. The casting process was melted and cooled in air to 40x40 mm thick ceramic ceramic molds heated up to 850 ºC. The obtained 40x40 mm square materials were rolled in 2 passes and deformation was applied at about 200-300%. Parts with a 15x15x10 mm were cut and sanded. The effects of boron on the wear behavior, which were added to the samples under 10 N load test and added at different rates, were examined by optical microscope.

International Iron & Steel Symposium
UDCS

Cemal ÇARBOĞA Bülent KURT Serkan DAL

In this study, the effect of boron addition at different ratios (2-38 ppm) on the microstructure and corrosion properties of Cr-Mo steels was investigated. Square cross-sections of the boron containing steels obtained at different ratios measuring 40×40 mm were rolled in three passes, and a deformation of totally 200-300 percent was obtained. The rolled specimens were examined by optical microscopy and corrosion test. Electrochemical potentiodynamic polarisation measurements were taken to evaluate corrosion behaviours of the examined steels. Analysing the potentiodynamic corrosion test results applied to the CrMo steels containing boron at different ratios, it is seen that there has been increase at the corrosion rates when the boron amounts are low.

International Iron & Steel Symposium
UDCS

Cemal ÇARBOĞA Bülent KURT B. Demirel Yavuz Sun Hayrettin Ahlatçı Engin ÇEVİK

Titanium (Ti) + Niobium (Ni) doped Interstitial Free (IF) steel grades (Ti + Nb IF steel) are widely used in steel industries because of their good formability properties. In this study, the effect of cold rolling reduction rate on the microstructure and mechanical properties of IF steel was investigated in details. The samples subjected to cold rolling with various reduction rates ranging from 40% to 80% at constant annealed temperature. The changes in microstructure were examined with optical microscope. Mechanical properties such as cupping values, anisotropy values (r) yield strength, tensile strength and elongation. were examined by Erichson and tensile test. The results affects the microstructural evolution and carbide precipitations significantly, in turn altering the mechanical properties. Increasing amount of cold rolling reduction rate resulted for an increase in the cupping values, anisotropy values, yield strength and elongation, whereas it leaded to a decrease in tensile strength. As a result of this trial experiment it can be said that reduction rate has a great effect on mechanical and microstructure properties of Ti+Nb doped IF steel. clearly demonstrated that the reduction rate of cold rolling.

International Iron & Steel Symposium
UDCS

Ali GÜNEN M. Mustafa ERŞEN Erdogan KANCA Murat YILDIZ Mehmet DEMİR Bülent KURT Mustafa Sabri Gök

B4C-Al kompozitler, hafifliği, yüksek mukavemeti, korozyona ve erozyona karşı yüksek direnç, sağlamlık ve iyi termal iletkenlik özelliklerinden dolayı otomobil, havacılık, savunma sanayi ve askeri sanayi gibi çeşitli uygulama alanları bulmuştur. Alüminyum içerisine sert partiküller ilave edilmesi sertlik, mukavemet ve korozyon direncinde iyileşmeler sağlar. Bor karbür (B4C) yüksek mekanik özelliklere ve çok iyi kimyasal kararlılık özelliklerine sahip olduğundan katkı malzemesi olarak kullanımı çok çekici görünür. Yapılan çalışmalarda nanopartikül takviyeli kompozitlerin daha düşük hacim fraksiyonlarında (<% 2) üstün özelliklere ulaşılabilmesine karşın, mikron ölçekli parçacıklar için daha yüksek hacim fraksiyonlarına (>% 10) ihtiyaç duyulduğu belirtilmektedir. Ayrıca son zamanlarda mekanik alaşımlama ve ektrüzyon ile B4C takviyeli Al kompozit üretimi yapılan araştırmalarda, nano B4C partikülleri kullanılarak daha iyi özelliklerin elde edilebileceği ortaya konulmuştur. Bu çalışmada % 3, %5, %10, %15, %20 oranlarında nano B4C takviye edilen Etial 141 Al alaşımından oluşan kompozit malzemeler mekanik alaşımlama ve sıcak presleme yöntemiyle üretilmiştir. Üretilen numunelerin sertlikleri Future Tech FM-700 marka mikro sertlik ölçme cihazında ölçülmüştür. Bu işlem 10sn süre ve 25gf yük altında gerçekleşmiş ve her bir numuneden 5 adet sertlik ölçümü alınmıştır. Alınan mikrosertlik ölçümlerinden nano B4C takviye oranı attıkça mikrosertlik değerlerinin de sürekli arttığı görülmektedir. Nano B4C takviyesinin kompozitte homojen bir dağılım sergilemesi numunenin farklı kısımlarından alınan sertlik değerlerinin de birbirine yakın çıkmasına yol açmıştır.

International Symposium on Light Alloys and Composite Materials
UHAKS

Bülent KURT Hakan Umur Serkan DAL Cemal ÇARBOĞA