caa a22 4500 445844264 CHVBK 20180317145353.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11085-011-9262-6 doi (NATIONALLICENCE)springer-10.1007/s11085-011-9262-6 Cyclic Oxidation Kinetics and Oxide Scale Morphologies Developed on the IN600 Superalloy [Elektronische Daten] [K. Al-Hatab, F. Alariqi, M. Al-Bukhaiti, U. Krupp, M. Kantehm] The oxidation behavior of the IN600 Ni-Cr-Fe superalloy was investigated in air at temperatures ranging from 750 to 950°C, for up to 12 cycles. Oxidation kinetics and oxide scale morphologies were examined using weight gain measurements, SEM-EDS, and X-ray diffraction. The cyclic oxidation kinetic results suggested that the oxidation behavior of the IN600 alloy approximately followed a sub-parabolic rate and the scaling process was controlled by the formation of a chromia scale. At 850°C, SEM-EDS observations indicated that the formed oxide scale was primarily composed of Cr2O3, and the internal oxidation of Cr and Ti occurred. At 950°C, a fast initial stage with high weight gain was observed, followed by a steady-state stage with gradual weight gain. Additionally, a considerable change in the oxidation kinetic occurred. SEM-EDS observations and XRD results indicated that the external scale was relatively thick with a localized porous, preferential adherent, and a complex oxide scale was developed. This complex oxide scale consisted of an outermost thin layer composed of MnCr2O4-Cr2O3 mixed together with a small amount of isolated TiO2, an intermediate relatively thick layer, composed of Cr2O3, and an innermost discrete layer formed at the scale/alloy interface, which enriched by Ni/NiO mixed with Ti-, Al-, and Fe-oxides. Finally, only the Al alloying element was internally oxidized to form Al2O3 fingers, which create a discrete and narrow internal oxidation zone. Al oxide was observed as a dark area and primarily grows along the alloy grain boundaries in the vicinity of the inward chromia pegs. Springer Science+Business Media, LLC, 2011 IN600 alloy nationallicence Cyclic oxidation kinetic nationallicence Oxide scale identification nationallicence Sub parabolic rate nationallicence Al-Hatab K. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut Alariqi F. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut Al-Bukhaiti M. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut Krupp U. Engineering and Computer Science, University of Applied Science, Osnabruck, Germany aut Kantehm M. Engineering and Computer Science, University of Applied Science, Osnabruck, Germany aut Oxidation of Metals Springer-Verlag 76/5-6(2011-12-01), 385-398 0030-770X 76:5-6<385 2011 76 11085 https://doi.org/10.1007/s11085-011-9262-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-011-9262-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Al-Hatab K. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut NATIONALLICENCE 700 1- Alariqi F. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut NATIONALLICENCE 700 1- Al-Bukhaiti M. Mechanical Engineering Department, Faculty of Engineering, Sana'a University, Sana'a, Yemen aut NATIONALLICENCE 700 1- Krupp U. Engineering and Computer Science, University of Applied Science, Osnabruck, Germany aut NATIONALLICENCE 700 1- Kantehm M. Engineering and Computer Science, University of Applied Science, Osnabruck, Germany aut NATIONALLICENCE 773 0- Oxidation of Metals Springer-Verlag 76/5-6(2011-12-01), 385-398 0030-770X 76:5-6<385 2011 76 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer