Research Article
Isothermal Oxidation Behaviour of 69.5Fe-14Ni-9Al-7.5Cr Alloy at High Temperatures
Table 2
Oxidation rate equations and rate constants of samples at different temperatures.
| Temperature | Oxidation rate | Equations | K | R2 |
| 800 °C | Linier | x = 6E-07t + 0.0002 | 6E-07 gr.cm−2.hr−1 | 0,7961 | Parabolic | x2 = 3E-10t + 4E-08 | 3E-10 gr2.cm−4.hr−1 | 0,8485 | Logarithmic | x = 5.1542E-05 log (t+0.6537) + 1.6124E-04 | 5.15E-05 gr.cm−2 | 0,9987 |
| 900 °C | Linier | x = 6E-07t + 0.0003 | 6E-07 gr.cm−2.hr−1 | 0,7117 | Parabolic | x2 = 4E-10t + 8E-08 | 4E-10 gr2.cm−4.hr−1 | 0,7568 | Logarithmic | x = 5.5723E-05 log (t+0,0777) + 2.4178E-04 | 5.57E-05 gr.cm−2 | 0,9941 |
| 1000 °C | Linier | x = 6E-07t + 0.0004 | 6E-07 gr.cm−2.hr−1 | 0,7301 | Parabolic | x2 = 6E-10t + 2E-07 | 6E-10 gr2.cm−4.hr−1 | 0,7593 | Logarithmic | x = 6.7479E-05 log (t+9.4928) + 3.6415E-04 | 6.74E-05 gr.cm−2 | 0,9958 |
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