The effect of temperature on the formation of oxide scales regarding commercial superheater steels

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: J. Lehmusto, D. Lindberg, P. Yrjas, L. Hupa
Publisher: Springer
Publication year: 2017
Journal: Oxidation of Metals
Journal acronym: Oxid. Met.
Volume number: 89
Issue number: 1-2
Start page: 251
End page: 278
eISSN: 1573-4889


Abstract


This study addresses the surface changes of three commercial steels (a low alloy ferritic 10CrMo9-10 steel, a Nb-stabilized austenitic AISI347 steel, and a high alloy austenitic Sanicro 28 steel) by comparing the oxide scale thicknesses, chemical compositions, and surface morphologies of samples after pre-oxidation at 200, 500, and 700 °C with different exposure times (5 and 24 hours) under humid or dry conditions.



With all three steels, the oxide scale thickness increased as functions of temperature and exposure time, the effect of temperature being more prominent than the effect of exposure time. The presence of water resulted in thicker oxide scales at the studied low alloy ferritic steel, whereas in the two austenitic steels, the presence of water increased chromium diffusion to the oxide scale rather than the scale thickness.



The oxide layers characterized and analyzed in this paper will be further studied in terms of their abilities to resist corrosion by exposing them under corrosive conditions. The results regarding the corrosion resistance of the steels will be published in a sequel paper.


Keywords

Austenitic stainless steel, High alloy austenitic stainless steel, High-temperature oxidation, Low alloy ferritic steel, Pre-oxidation

Last updated on 2019-17-08 at 05:16