High Temperature Oxidation Behavior of Creep Resistant Steels in Water Vapour Containing Environments

Materials

Martin Fujda¹  Miloš Matvija¹  Gabriela Baranová¹  Mária Hagarová¹  Peter Horňak¹  Daria Yudina²  Jozef Bednarčík² 

[1] Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, 042 00 Košice, Slovakia;Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, 041 54 Košice, Slovakia;

关键词: creep resistant steels;    high temperature oxidation;    water vapour;    oxide layer;    Cr oxide;   

DOI  :  10.3390/ma15020616

来源: DOAJ

【 摘 要 】

This study describes the water vapour effect on the oxidation resistance of 9Cr creep resistant steels. Boiler P91 and MarBN steels were oxidized for 3000 h in a simulated humid atmosphere with ~10% water vapour. The oxidation kinetics had a stable course for 1000 h and was evaluated by the weight gain curves for both experimental steels and both oxidation temperatures. The oxidation rate was higher at 650 °C versus 600 °C, as reflected by the oxidation rate coefficient. A significant increase occurred after 1000 h of oxidation, which was related to the local breakdown oxide scale and oxide nodules were formed on steel. This oxidation behavior was influenced by the fact that a compact spinel structure of iron oxides and alloying elements were not formed on the steel. Analysis after 3000 h of exposure showed hematite Fe₂O₃ formed on the outer layer, magnetite Fe₃O₄ on the middle layer, and the bottom layer consisted of iron-chromium-spinel (Fe,Cr)₂O₃.

【 授权许可】

Unknown