Person:
UZUN KART, ELİF

Profile Picture

Email Address

Birth Date

Research Projects

Organizational Units

OrgUnit Logo
Organizational Unit

Job Title

Last Name

UZUN KART

First Name

ELİF

Name

Filters

2021 - 20222
Reset filters

Settings

Has files: true × Subject: NICKEL ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    PublicationOpen Access
    Investigation Mechanical and Microstructural Behavior of Operated and Unoperated Turbine Rotor Discs
    (2022-02-01) UZUN KART, ELİF; UZUN KART E., ÖZGÜL C.
    In gas turbine engines, turbine sections are exposed to high temperature and loads during operation and therefore turbine inlet boundary is considered the most challenging for turbomachines. Ni-based super-alloys are used for turbine materials in gas turbine engines because of their superior mechanical characteristics at high temperatures. In this research, two Mar M-247 polycrystalline cast Ni-based turbine rotors, which were operated and non-operated in turbojet engine tests, had the same design and applied the same two-step aging heat treatment, were examined microstructurally and mechanically. As a result of the mechanical analysis, it was observed that the tensile strength (Rm (P): 537Mpa; Rm (G): 590 Mpa) ductility, and hardness (429 HV (P), 440 HV (G)) of the operated turbine rotor increased. In the microstructure analysis, blocky and Chinese script-like carbides and gamma prime eutectic islands were found in both turbine structures. EDS analysis showed that the carbides in the matrix are rich in Hf, Ta, and Ti, and the grain boundary carbides are rich in Cr and W.
  • Thumbnail Image
    PublicationOpen Access
    Investigation of iron selectivity behavior of copper smelter slag flotation tailing with hematitization baking and base metals leaching methods
    (OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, 2021-09-06) UZUN KART, ELİF; Kart, Elif Uzun; Yazgan, Zeynep Hazal; Gumussoy, Aleyna
    In this study, iron selectivity behaviour of copper smelter slag (CSS) flotation tailings (38.08% Fe, 0.35% Cu, 4.48% Zn, 0.16% Co, 0.37% S) having fayalite and magnetite as major minerals was investigated with hematitization baking and base metals leaching methods using mineralogical and chemical analyses. For selectivity of iron, it was baked at temperatures of 650-690-700-710-730 degrees C. The aim of the baking is to transform the almost all of the iron in the fayalite into the oxidized (non-soluble) form and the base metals into the sulphated (soluble) form. The temperature that had the lowest hematitization rate of iron was found to be 650 degrees C, and the highest temperature was found to be 730 degrees C. To examine the dissolution behaviour of baked CSS flotation tailing was leached at 50 degrees C at a 1/10 (w/v) for 1 hour by using water. After baking at 690 degrees C calcine and leaching residue, S values were determinated to be approximately 17% and 9%, respectively. Baking made at 700 degrees C, amount of sulfate also decreased to 10% and S content was measured as 4% of its leaching residue. As a result of this study, 690 degrees C/700 degrees C was determined as optimum conditions of hematitization baking and base metals were extracted selectively when the iron was remained at leaching residue in Fe2O3 phase. It was determined that, hematitization is high and the sulphates of the base metals are preserved at 700 degrees C temperature. The fayalite phase completely decomposed into Si-O/Fe-O/Zn-S-O/Co-S-O compounds at 700 degrees C baking which was the highest iron selective and base metals dissolute temperature.