Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8014591 | Materials Letters | 2018 | 4 Pages |
Abstract
The mechanical performance and electrochemical stability in simulated body fluid (SBF) of a lightweight Fe-30Mn-10Al-1C (in wt.%) alloy after gas nitridation were investigated. The gas nitriding process was performed at 550â¯Â°C for 5â¯h under pure NH3 atmosphere. The nitrided layer was â¼45â¯Î¼m-thick and consisted predominantly of fine AlN. The surface microhardness, ultimate tensile strength, yield strength, and elongation of the present gas-nitrided alloy are 1814â¯Hv, 1078â¯MPa, 1024â¯MPa, and 77%, respectively. The corrosion tests in SBF showed that the gas-nitrided alloy exhibited a corrosion current density (Icorr) of 5.0â¯Ãâ¯10â9â¯A/cm2, a pitting corrosion current density (Ipit) of 5.1â¯Ãâ¯10â7â¯A/cm2, and a passivation region with ÎE (â¡Epâ¯ââ¯Ecorr)â¯ââ¯+1804â¯mV, respectively, which are substantially better than those obtained in the plasma-nitrided and hydroxyapatite-coated 316L stainless steel. The results demonstrated that the present gas-nitrided alloy having an excellent combination of strength, ductility and corrosion resistance is a promising candidate to replace 316L stainless steel for medical implants.
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Authors
Shun-Jen Hsueh, Jhen-Yi Huang, Chuen-Guang Chao, Jenh-Yih Juang, Tzeng-Feng Liu,