The oxide-scale growth and metal loss kinetics during oxidation in air of 2 1/4 Cr-1 Mo steel were studied at 600, 700, and 800°C for times up to 1000 h, with cylindrical specimens similar to creep test pieces. The scale thickness (x) was observed to exhibit a gradually decreasing growth rate with the exposure time (t) according to approximated parabolic behavior of type at the temperature levels of 700 and 800°C. The coefficient exhibited Arrhenius-type temperature dependence with an activation energy value of 212 kJ/mol. At 600°C, parabolic behavior was not verified, and the scale thickness growth follows better a relation of type The metal thickness (y) was observed to exhibit a gradually decreasing loss rate with the exposure time according to parabolic behavior of type at the three temperature levels. The coefficient also exhibited Arrhenius-type dependence with an activation energy value of 215 kJ/mol. These two values of are close do the value for diffusion of iron on the chromium-rich internal oxide layer formed in the material. Based on the equations of metal loss kinetics, the variation of the cross-sectional area of the specimens with time could be determined and plots of stress enhancement factors developed to assess the effect of oxidation on creep testing results.
High-Temperature Oxidation Behavior of Cr-1Mo Steel in Air–Part 2: Scale Growth, Metal Loss Kinetics, and Stress Enhancement Factors During Creep Testing
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference (Joint w/ICPVT), Boston, Massachusetts, August 1–5, 1999, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, January 2000; revised manuscript received October 27, 2000. Editor: S. Y. Zamrik.
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Bueno, L. O., and Marino, L. (October 27, 2000). "High-Temperature Oxidation Behavior of Cr-1Mo Steel in Air–Part 2: Scale Growth, Metal Loss Kinetics, and Stress Enhancement Factors During Creep Testing ." ASME. J. Pressure Vessel Technol. February 2001; 123(1): 97–104. https://doi.org/10.1115/1.1335498
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