Akademik Veri Yönetim Sistemi
International Marmara Sciences Congress (Imascon Autumn) 2022, Kocaeli, Türkiye, 9 - 10 Aralık 2022, ss.25
The production of parts by powder metallurgy method is widely used today and it is an alternative way
to classical production methods. In this context,the preparation of stainless steel by powder metallurgy
method has been the subject of investigation due to different alloy choices,its ability to produce
components with various mechanical properties. In this study,duplex stainless steels,which are generally
produced by casting method, were studied using the mechanical alloying technique.First,duplex
stainless steel type was determined in line with the information obtained by examining the scientific
articles published on this subject. Elemental 99.9% Fe-Cr-Ni powders with 75% Fe (Iron), 20% Cr
(Chromium) and 5% Ni (Nickel) ratios were mixed with 1% mold lubricant stearic acid, ball powder
ratios were 6:1and12:1, total times were 10hr,20hr and 40hr, the rotational speeds of the ball mill were
applied as 300RPM and 500RPM. After mechanical alloying with the help of a planetary ball mill, XRD
analyzes were made to the new powder mixtures formed as a result of the process. Mechanically alloyed
powder materials compressed in the mold with at 120 bar pressure. Sintering of the samples were carried
out under flow of argon gas, including removal of stearic acid for 1 hour at 550 °C in sinter furnace, and
sintering for 1 hour at 1300°C. After preparation for metallographic imaging of duplex stainless steel
samples,the microstructures of the sintered samples were taken with optical microscope. Samples were
subjected to hardness tests. As a result, optimum results were obtained at 300 RPM grinding speed with
6:1 powder / ball ratio for 10 hours.