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	R^2
800 °C	Linier	x = 6E-07t + 0.0002	6E-07 gr.cm^−2.hr^−1	0,7961
	Parabolic	x^2 = 3E-10t + 4E-08	3E-10 gr^2.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	x^2 = 4E-10t + 8E-08	4E-10 gr^2.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	x^2 = 6E-10t + 2E-07	6E-10 gr^2.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