B0772 Lifetime modelling of high temperature corrosion by M. Schutze

By M. Schutze

This publication includes papers provided at a workshop held in Frankfurt am major, Germany in February 2001. The sections comprise papers on: alumina formers; iron oxide and chromia formers; composites and coatings; thermal barrier platforms; and common lifetime prediction methods

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8 mm were oxidised at 1200°C by the [ulich team (these data are reported in detail elsewhere in this volume [14]). The samples were furnace cooled every 100 h and weighed. Net and gross mass gains were recorded allowing the mass of spall to be calculated. The furnace cooling rate was close to 102°C/h. 45mg cm? 8 mm thickness. 36 mm. 38 mm has been used (similar to the thinner Kanthal APM samples evaluated above). For a 5 urn thick alumina scale the critical temperature drop is 1005°C at a cooling rate of 104 °C/h from 1200°C (see Table 2).

17 Dependence of [Alcrit] (analysed) with thickness for five commercial FeCrAIRE alloys oxidised in air at 1100-1300°C. shown in Fig. g. on transient oxidation, diffusion processes) originating from the various reactive elements (RE) and levels of other minor alloy constituents that differed between these alloys. During growth defects developed within the alumina scale and probably also at the scale-substrate interface. e. at a critical scale thickness, interaction between this porosity and the applied stress resulting from scale growth and also on cooling due to the CTE (coefficientof thermal expansion) mismatch between the scale and substrate caused mechanical failure (cracking and spallation) of the scale [8].

8mm :t coa. CJ) 15 CJ) CJ) m ~ 3 2 B/O KanthalAPM 0 5 0 10 15 20 25 30 Mass gain, mg crrr" 6 (C) -<>- ~ 5 0) E coa. 8mm 3 15 CJ) CJ) m ~ 2 1 0 0 1 2 3 4 5 6 Mass gain, mg crrr? Fig. 9 Plots of the extent of spallation against gross mass gain for the cyclic oxidation in air of (a) Kanthal AF, (b) Kanthal APM, and (c) PM2000 at 1200°C. 83mm c~ 0 ~ co 2 0.. 97mm .. --... 93mm E co 2 ~ co B/O 0.. 94mm c~ 0 ~2 co 0.. CI) PM2000 0 0 5 15 20 10 Gross mass gain, mg ern= 25 30 Fig. 10 Plots of the extent of spallation against gross main gain for the cyclic oxidation of (a) Kanthal AF in air of Kanthal AF, (b) Kanthal APM and (c) PM2000.

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