Authors:
G. VourliasDepartment of Physics, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece

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N. PistofidisDepartment of Physics, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece

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P. PsyllakiDepartment of Mechanical Engineering, Technological Education Institute of Piraeus (TEI), 122 44 Egaleo, Greece

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E. PavlidouDepartment of Physics, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece

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K. ChrissafisDepartment of Physics, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece

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Abstract  

The oxidation of a precipitation-hardening (PH) steels is a rather unexplored area. In this study an attempt is made to estimate the oxidation mechanism and the kinetics that take place up to 850 °C. For this purpose specimens of the material under examination were isothermally heated at 725, 775, 800, 825, and 850 °C for 12 h in O2 atmosphere. The as-treated samples were examined with SEM and XRD, while kinetics were based on thermogravimetric (TG) results. From this examination it was deduced that the oxidation of this steel is accomplished at minimum three steps, following the changes of the scale morphology and the kinetics. After 850 °C although that the oxidation rate increases, the scale morphology does not change. From the calculations of the rate constant kp and the activation energy for the phenomena below 850 °C, it was deduced that the oxidation phenomena during this stage provides another barrier to the deterioration of the ferrous material.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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Inorganic polymeric new materials

Author:
J. Davidovits