Title :
On the oxidation of steel in CO2 and air
Author :
Hosseinali, Gity Samadi ; Akhtar, Ainul
Author_Institution :
Powertech Labs. Inc., Surrey, BC, Canada
Abstract :
Oxidation of a low alloy 0.3% carbon steel (SAE 4130) was investigated using SEM, X-ray diffraction and optical metallography. Closed cylindrical specimens were treated at 860°C for up to 2h in air and carbon dioxide, under pressure in the range of 0.1-0.7 MPa. At the initial stage, wustite grew through the coalescence of small clusters of crystallites. The size of wustite grains was dependent on the kind of gas and independent of the gas pressure. The time dependence of wustite grain growth has been studied. It was found that during the initial stage of oxidation wustite grains grow epitaxially and by grain coalescence. Isothermal transformation of wustite into magnetite (Fe3O4) was studied in the temperature range of 550°C-610°C. The results suggest that it may be possible to have the desired proportion of wustite and magnetite, which can be controlled by the processing environment
Keywords :
X-ray diffraction; alloy steel; carbon steel; grain growth; isothermal transformations; oxidation; rapid thermal processing; scanning electron microscopy; surface phase transformations; 0.1 to 0.7 MPa; 2 h; 550 to 610 C; 860 C; Fe3O4; FeO; SEM; X-ray diffraction; closed cylindrical specimens; clusters of crystallites; coalescence; epitaxial development; grain growth; initial stage of oxidation; isothermal transformation; low-alloy carbon steel; magnetite; optical metallography; oxidation in CO2; oxidation in air; processing environment; rapid oxidation reaction; scale formation; time dependence; wustite grains; Carbon dioxide; Crystallization; Iron alloys; Isothermal processes; Optical diffraction; Oxidation; Proportional control; Steel; Temperature distribution; X-ray diffraction;
Conference_Titel :
Intelligent Processing and Manufacturing of Materials, 1999. IPMM '99. Proceedings of the Second International Conference on
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-5489-3
DOI :
10.1109/IPMM.1999.792515
