This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.3184/096034005782744452 in citations.
Effect of Carbon Content on the Oxidation Behaviour of FeCrAlY-Alloys in the Temperature Range 1200-1300°C
Effect of Carbon Content on the Oxidation Behaviour of FeCrAlY-Alloys in the Temperature Range 1200-1300°C
Two FeCrAlY alloys with different carbon contents (90 and 500 ppm respectively) were investigated in respect to their oxidation behaviour at 1200 and 1300 degrees C in air. Oxidation tests, with exposure times ranging from a few hundred to several thousands of hours, revealed that the growth rate of...
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Personal Name(s): | Kochubey, V. |
---|---|
Al-Badairy, H. / Le-Coze, J. / Naumenko, D. / Tatlock, G. J. / Wessel, E. / Quadakkers, W. J. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 |
Published in: | Materials at high temperatures, 22 (2006) S. 461 - 466 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2006
|
Physical Description: |
461 - 466 |
DOI: |
10.3184/096034005782744452 |
Document Type: |
Journal Article |
Research Program: |
Rationelle Energieumwandlung |
Series Title: |
Materials at High Temperatures
22 |
Subject (ZB): | |
Publikationsportal JuSER |
Two FeCrAlY alloys with different carbon contents (90 and 500 ppm respectively) were investigated in respect to their oxidation behaviour at 1200 and 1300 degrees C in air. Oxidation tests, with exposure times ranging from a few hundred to several thousands of hours, revealed that the growth rate of the protective alumina scale was hardly affected by the alloy C-content. However, the time to occurrence of breakaway oxidation for the specimens (1 mm thickness) was substantially shorter for the high-than for the low-C alloy. This was primarily caused by poorer oxide scale adherence but additionally by a higher critical Al-content for occurrence of breakaway of the high-C alloy compared to the low-C alloy.Extensive microstructural studies revealed formation of Cr-carbides at the grain boundaries in both alloys. The high-C alloy additionally showed carbide formation at the scale/metal interface, thus deteriorating scale adhesion. Furthermore, inter- and intra-granular carbide precipitation is considered to induce strengthening of the metal, thus hindering relaxation of the thermally-induced oxide stresses by substrate creep. In a series of experiments with variations in the cooling rates, it was verified that carbide formation very likely occurs during specimen cooling. |