SEARCH RESULT

High CrMo (W) steel is widely used in ultra-super critical (USC) power plant applications operation temperature up to 620 oC. The steels and their weld metal are used for tempered condition. Tempering temperature must be below Ac1 temperature of the weld metal. Welding of the steel is generally applied by shielded metal arc welding (SMAW) with multi-pass process. In this study, stick electrodes were fabricated for high chromium tungsten steel in Gedik Welding Company. Microstructure and mechanical properties of the all weld metal produced by the stick electrodes were investigated following tempering at 760 oC for 4h. Microstructure was characterized by optical microscope (OM) and scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS). Differential scanning calorimetry (DSC) analyze was used to determine transformation temperature of the weld metal. Hardness measurement, tensile test and charpy impact test were carried out. Fracture surfaces of the samples were also investigated via SEM.

International Iron & Steel Symposium
UDCS

Fikret KABAKCI Mustafa ACARER Selcuk KESKINKILIC Filiz KUMDALI ACAR İsmail Hakkı Kara

In the study, the AZ31 and AZ31+ La%0.2 Mg alloys were produced by low pressure casting method following homogenization at 400°C for 24 hours and the hot rolling process applied with 15% deformation rate per pass at 400°C. The surface treatment process of shot peening was practised on materials for enhancement corrosion properties of them. To observe corrosion behaviour of investigated alloys the immersion corrosion test in %3.5 NaCl environment and metallographic examination were utilized.

International Symposium on Light Alloys and Composite Materials
UHAKS

Soner Arı İsmail Hakkı Kara Medine Kılıç Yaren Karauğuz Okan Ünal Yunus Türen Yavuz Sun Süleyman Yaşın Batuhan Özusta Hayrettin Ahlatçı

In the study, the AZ31 and AZ31+ La%0.5 Mg alloys were produced by low pressure casting method following homogenization at 400°C for 24 hours and the hot rolling process applied with 15% deformation rate per pass at 400°C. The surface treatment process of shot peening was practised on materials for enhancement mechanical properties of them. The surface roughness of AZ31 and AZ31+ La%0.5 Mg alloys how is developed by shot peening process also was determined.

International Symposium on Light Alloys and Composite Materials
UHAKS

Nihal Kanca İsmail Hakkı Kara Özlem Keleş Canan Dursun Okan Ünal Yunus Türen Yavuz Sun Hayrettin Ahlatçı Süleyman Yaşın

Abstract In this study, AZ31 and AZ31+1.0La wt% alloys were produced by a low pressure die casting method. The rolling capability of these alloys was investigated at different rolling parameters such as speeds and deformation rates. Macro images of sheets were utilized to observe effects of amount La on rolling capability and light optical microscopy, were employed to characterize the microstructure of the alloys. It was observed that crack formation usually was occurred on lower rolling speeds and higher deformation rates.

International Symposium on Light Alloys and Composite Materials
UHAKS

İsmail Hakkı Kara Hayrettin Ahlatçı Yunus Türen Yavuz Sun Mehmet Ünal

In this study, the wear behavior of hot rolled AZ31 and AZ31-X wt% La Mg alloys were investigated. After the microstructure characterization, hardness and wear tests, the effect of La on the wear resistance of AZ31 Mg alloy were reported. Hot Rolling process introduced the twins and DRXs on the microstucture wherein the changing of grain boundaries density impart wear resistance to AZ31 Mg alloy.

International Conference of Advanced Materials and Manufacturing Technologies
ICAMT

İsmail Hakkı Kara Hayrettin Ahlatçı Yunus Türen Yavuz Sun Harun ÇUĞ Mehmet Ünal