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

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: J. Lehmusto, D. Lindberg, P. Yrjas, L. Hupa
Förläggare: Springer
Publiceringsår: 2017
Tidskrift: Oxidation of Metals
Tidskriftsakronym: Oxid. Met.
Volym: 89
Nummer: 1-2
Artikelns första sida, sidnummer: 251
Artikelns sista sida, sidnummer: 278
eISSN: 1573-4889


Abstrakt


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.


Nyckelord

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

Senast uppdaterad 2019-16-10 vid 02:47