Abstract
Thermogravimetric measurements, metallography and electron probe microanalysis show that Fe-14.0% Cr generally produces only Cr 2O 3-rich scales in 1 atm O 2 at 800 and 1000 °C. This also occurs initially at 1200 °C, both for normally oxidized specimens and for specimens previously preferentially oxidized, but subsequently rapidly growing stratified scale develops. This happens after localized lifting and cracking of the initial, stressed protective scale has revealed the Cr-depleted alloy to oxygen, and eventually it covers the entire specimen. The outer region contains virtually pure Fe oxides and the inner region shows alternating Cr-rich and Fe-rich layers. Factors affecting scale lifting and cracking are investigated and described and a theory explaining the stratified scale structure is postulated, in terms of differing Fe and Cr ion mobilities in the Fe chromite spinel structure of variable composition.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
