1 results listed
Co-Cr and 316L are the commonly used alloys in biomedical industry. However, both 316L and mostly used
Co-Cr alloys as F-562, L-605 contain large portions of Ni as alloying element. Ni may cause allergic and
toxic impacts on human health. In recent years, N-alloyed Ni free stainless steels seemed as good candidate
for replacing Ni contained metals. However, liquid steel has a limited N solubility at atmospheric pressure.
Thus, high pressured melting techniques are required. In this study, N alloying of ferritic 430 stainless steel
sheet was performed in solid state. Nitrogen absorption of stainless steel was performed in a furnace filled
with nitrogen gas with atmospheric pressure at 1200°C. Solid state N absorption was applied in four different
time periods as 4, 8, 12, 24 hours. Microstructure after absorption process was investigated by Scanning
Electron Microscope and Light Microscope. Fully austenitic structure was observed in surface of specimens.
However, duplex microstructure of ferrite and austenite was seen in the center of specimen. Vickers hardness
was carried out to evaluate of phases. It was concluded that optimum microstructure is achieved by 4 hours
of N absorption.
International Iron & Steel Symposium
UDCS
Oğuz Gürkan Bilir
İsmail GÜVENİR
Ersoy Erişir