A novel high-strength,high-ductility and high-corrosion-resistance FeAlMnC low-density alloy |
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| Authors: | Po-Chih Chen Chuen-Guang Chao Tzeng-Feng Liu |
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| Affiliation: | 1. Department of Materials Science & Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea;2. Next Generation Product Research Group, POSCO Technical Research Laboratories, Pohang 790-785, Republic of Korea;1. Department of Materials Science and Engineering, RIAM, Seoul National University, Seoul, 151-744, Republic of Korea;2. Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, Gyeongnam, 642-831, Republic of Korea;3. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea;1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;3. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Kwangyang 545-090, Republic of Korea;1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;2. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Kwangyang 545-090, Republic of Korea |
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| Abstract: | The as-quenched Fe–8.68 wt.% Al–30.5 wt.% Mn–1.85 wt.% C alloy is plasma-nitrided at 500 °C for 8 h. The nitrided layer obtained is 40 μm thick and composed predominantly of AlN, with a small amount of Fe4N. The resultant surface hardness (1860 Hv), substrate hardness (550 Hv), ductility (33.6%) and corrosion resistance in 3.5% NaCl solution in the present nitrided alloy are far superior to those obtained previously in optimally nitrided high-strength alloy steels, as well as martensitic and precipitation-hardening stainless steels. |
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