High-temperature oxidation of boiler steels at 650 °C

Jaka Burja (Author), Barbara Šetina (Author), Borut Žužek (Author), Tilen Balaško (Author)

Abstract

This study presents a comprehensive investigation of the formation, composition and behaviour of oxide layers during the high-temperature oxidation of four different steel alloys (16Mo3, 13Cr, T24 and P91) at a uniform temperature of 650 °C. The study is aimed at assessing the oxidation damage due to short-term overheating. The research combines CALPHAD (CALculation of PHAse Diagrams) calculations, thermogravimetric analysis (TGA) and advanced microscopy techniques, in- cluding scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), to elucidate the complex mechanisms controlling oxidation kinetics and oxide layer development. CALPHAD calculations were used to determine the thermodynamically stable phases for each steel type at 650 ◦C and different oxygen activities. The results showed different phase compositions, highlighting the importance of the chromium content in steel for the formation of oxide layers. The different oxidation kinetics and oxide layer compositions are presented and associated with the increased risk of material degradation due to overheating. These results have significant implications for industrial applications, mainly the susceptibility to oxidation of low-alloyed steels like 16Mo3 and 13 Cr and contribute to a deeper understanding of oxidation processes in steels.

Keywords

high-temperature oxidation;thermogravimetric analysis;kinetics;CALPHAD;boiler steels;SEM;EBSD;

Data

Language:	English
Year of publishing:	2023
Typology:	1.01 - Original Scientific Article
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
Publisher:	MDPI
UDC:	669
COBISS:	172044803
ISSN:	2075-4701
Views:	204
Downloads:	92
Average score:	0 (0 votes)
Metadata:

Other data

Source comment:	Article no.: 1887;
Pages:	str. 1-16
Volume:	ǂVol. ǂ13
Issue:	ǂiss. ǂ11
Chronology:	2023
DOI:	10.3390/met13111887
ID:	22635534