Oxidation behavior of TiC particle-reinforced 304 stainless steel |
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Authors: | Qianlin Wu Jianqiang Zhang |
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Affiliation: | a Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, PR China b School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia c School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China |
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Abstract: | TiC particle-reinforced 304 stainless steels were prepared using a new developed in situ technology and exhibited the uniform distribution of TiC particles in the matrix. The oxidation behavior of 304SS-2TiC and 304SS-6TiC (all in weight percentage) was compared with that of 304SS at 850 °C in air for 96 h using thermogravimetry analysis. For 304SS, the rate of weight gain was very slow initially, but accelerated suddenly to a very high level, forming breakaway oxidation. The addition of TiC particles to 304SS resulted in no breakaway oxidation and maintained a low oxidation rate in the whole reaction time investigated. Examination of oxide scale morphology and cross-section analysis by scanning electron microscopy and optical microscopy showed a significant scale spallation and a deep oxide penetration in the case of 304SS, but a rather continuous, dense and adherent oxide layer formed on the surface of TiC particle-reinforced alloys. XRD analysis revealed the presence of Cr2O3 together with spinel-type oxides in the oxide scale. For TiC-containing alloys, fine TiO2 was also found on the surface and the amount of this oxide increased with TiC addition. The TiC addition developed finer matrix structure before oxidation, which accelerates chromium diffusion. As a result, scale adherence was improved and oxidation resistance was increased. |
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Keywords: | A. TiC A. 304 stainless steel C. Oxidation C. Breakaway oxidation C. Spallation resistance |
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