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Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si 합금의 고온 산화에 미치는 S의 영향
이동복(Dong Bok Lee),이경환(Kyong-Hwan Lee),배근수(Geun Soo Bae),조규철(Gyu Chul Cho),정재옥(Jae Ok Jung),김민정(Min Jung Kim) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
Two kinds of steels whose compositions were Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si-(0.009 or 0.35)S (wt.%) were centrifugally cast, and oxidized at 900 ℃ for 50-350 h in order to find the effect of sulfur on the high-temperature oxidation of Fe-34.4Cr-14.5Ni-2.5Mo-0.4W-0.4Mn-0.5Si-(0.009 or 0.35)S (wt.%) alloys. These alloys formed oxide scales that consisted primarily of Cr₂O₃ as the major oxide and Cr₂MnO₄ as the minor one through preferential oxidation of Cr and Mn. They additionally formed SiO₂ particles around the scale/alloy interface as well as inside the matrices. The high affinity of Mn with S led to the formation of scattered MnS inclusions particularly in the 0.35S-containing cast alloy. Sulfur was harmful to the oxidation resistance, because it deteriorated the scale/alloy adherence so as to accerelate the adherence and compactness of the formed scales.
이동복(Dong Bok Lee),정재옥(Jae Ok Jung),박순용(Soon Yong Park),조규철(Gyu Chul Cho),Xiao Xiao,김민정(Min Jung Kim) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.2
Fe-2 wt.%Ni alloys were fabricated by metal powder injection molding, and their oxidation behavior at 600-700oC for 30 h in air was studied in order to find the effect of the small addition of Ni in the iron matrix on the high-temperature oxidation. Oxide scales that formed after oxidation consisted primarily of Fe₂O₃, where microscopic voids were scattered. Nickel was segregated initially at the scale/matrix interface, and later at the lower part of the Fe₂O₃ scale. At 600℃, Fe-2wt.%Ni alloys oxidized parabolically initially, and linearly after 15 h. At 650-700℃, they oxidized linearly from the initial period. Although Fe-2wt.%Ni alloys oxidized slower than pure iron, their oxidation rates were relatively fast.