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| AN INVESTIGATION OF THE OXIDATION DYNAMICS OF AN Fe-Cr-Ni-Ti SUPERALLOY |
| Wang Jiamin Dong Peiuhan and Liu Ye(Luoyang Shipbuilding Material Research Institute) NortheastInstitute of Technology Shenyang |
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Abstract The oxidation kinetics of an Fe-Cr-Ni-Ti superalloy, containing 4.43at％ titanium was studied in air over the temperature range of 700～900℃ for period of 10 minutes to 500 hours. The weightgain due to oxidation obeyed the conventional parabolic lair and the values of activation energy were Qp_1=38 kcal/mol and Qp_2=42 kcaI/mol. The depth of penetrating pits obeyed linear iaw. AES/ESCA indicated the initial sclae was rich in Ti, Fe and Cr, Consiting mainly of Fe_2O_3, TiO, and Cr_2O_3. By X-ray analysis the long-term oxides were estimated to be NiTiO_3 and FeCr_2O_4. The cation vacanies generated in oxidition at the alloy-scale inteerface joined up to produce oracks and caused spalling. The selective oxidation of η-Ni_3Ti phases genrated random penetsrating pits. The higher titanium concentration obstructed the formation of Cr_2O_3 protective scale and promoted the formation of NiTiO_3, thus deteriorated the oxidation resistance
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Received: 25 April 1986
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Cite this article:
Wang Jiamin Dong Peiuhan and Liu Ye(Luoyang Shipbuilding Material Research Institute) NortheastInstitute of Technology Shenyang. AN INVESTIGATION OF THE OXIDATION DYNAMICS OF AN Fe-Cr-Ni-Ti SUPERALLOY. J Chin Soc Corr Pro, 1986, 6(2): 145-152.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1986/V6/I2/145
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