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TECHNICAL PAPERS

High-Temperature Oxidation Behavior of 214Cr-1Mo Steel in Air—Part 1: Gain of Mass Kinetics and Characterization of the Oxide Scale

[+] Author and Article Information
Luiz Marino, Levi O. Bueno

Departmento de Engenharia de Materiais, Universidade Federal de São Carlos, 13565-905 São Carlos (SP), Brazil

J. Pressure Vessel Technol 123(1), 88-96 (Oct 27, 2000) (9 pages) doi:10.1115/1.1335499 History: Received January 01, 2000; Revised October 27, 2000
Copyright © 2001 by ASME
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References

Figures

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Optical micrograph of the material in the as-received condition. Magnification: 400×. Etching potassium bissulfite.
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Variation of gain of mass per area as function of time for (a) 600°C, (b) 700°C, and (c) 800°C
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Variation of the Log(Δm) with Log(time). Symbols represent the experimental data and straight lines the linear regression fitting.
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Variation of Log(Kgm ) as function of inverse temperature
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Schematic cross section of oxide layers on cylindrical specimens of 214Cr-1Mo steel after oxidation in air
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Optical micrographs of the specimen exposed to 600°C during 105 h—(a) presence of the three layers, 175×; (b) detail of cavities in the magnetite layer surrounded by Fe2O3, 230×
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Optical micrographies of specimen exposed to 700°C during—(a) 308 h, 35×; (b) 1056 h, 17×
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Scanning electron micrographies—(a) specimen exposed to 700°C during 476 h, etching: Nital, 100×; (b) specimen exposed to 800°C, 40 h, no etching, 140×
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Variation in the contents of Cr, Mo, and Mn in oxide scale of specimen exposed to 800°C during 40 h
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Oxide-scale SEM fractographies of the specimen exposed to 800°C during 97 h—(a) general view of the different oxide layers, 100×; (b) detail of the internal oxide layer of the same specimen, 3000×
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Oxide-scale SEM fractographies of the specimen exposed to 800°C during 97 h—(a) view of the intermediate layer of magnetite, 500×; (b) detail of the grain structure of the stratum formed between the intermediate and external oxide layers, 1000×
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Oxide-scale SEM fractographies—(a) view of the external hematite layer after 800°C, 97 h, 1000×; (b) hematite crystals formed on the external surface after 700°C, 2.5 h, 1000×; (c) detail of previous micrography, 5000×

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