Print Email Facebook Twitter Kinetics of internal oxidation of Fe-Mn-Cr steel alloys Title Kinetics of internal oxidation of Fe-Mn-Cr steel alloys Author Ma, Yao (TU Delft Mechanical, Maritime and Materials Engineering; TU Delft Materials Science and Engineering) Contributor Sloof, W.G. (mentor) Mao, W. (graduation committee) Degree granting institution Delft University of Technology Programme Materials Science and Engineering Date 2017-08-04 Abstract Selective oxidation behaviour of Fe-Mn-Cr steel alloys annealed at 950°C in Ar plus 5 vol.% H2 atmosphere under different annealing time and dew points was studied. The Fe-Mn-Cr steel alloys are externally oxidized when annealing at dew point of -45 °C, while internally oxidized at dew points of -10 and 10 °C. The internal oxides formed in the Fe-Mn-Cr steel alloys are (Mn, Fe)O and (Cr, Mn, Fe)3O4. The kinetics of internal oxidation of Fe-Mn-Cr alloys at 950 °C is diffusion controlled and follows parabolic growth rate law. The measured kinetics of internal oxidation of Fe-Mn-Cr alloys and the concentration depth profiles of internal oxides are in good agreement with simulation results. Adding Cr to the Fe-Mn steel alloys decreases the kinetics of internal oxidation. The growth rate of internal oxidation zone can be predicted by a modified Wagner’s internal oxidation model. The external oxides formed during annealing of Fe-Mn-Cr steel alloys cannot be reduced by H2. However, an oxide-free steel surface can be obtained by first forming and then reducing a Wüstite scale. Subject Internal oxidationkineticsFe-Mn-Cr steel alloysannealing To reference this document use: http://resolver.tudelft.nl/uuid:b4fe5e1f-78c3-4729-bf3c-2f8043f42528 Embargo date 2017-08-07 Part of collection Student theses Document type master thesis Rights © 2017 Yao Ma Files PDF Master_Thesis_Yao_Ma_v6_1_.pdf 8.16 MB Close viewer /islandora/object/uuid:b4fe5e1f-78c3-4729-bf3c-2f8043f42528/datastream/OBJ/view