TY - GEN
T1 - Analysis on the Structure and Mechanism of Cracking and Spalling for Super304H Steel Oxide Films in High-Temperature Steam
AU - Li, Yan Hui
AU - Wang, Shu Zhong
AU - Li, Xue Dong
AU - Ren, Meng Meng
PY - 2014
Y1 - 2014
N2 - In this paper, by means of Scanning Electronic Microscope (SEM), X-ray diffraction analyzer (XRD) and Cross hatch scanning analysis, the Structure and mechanism of cracking and spalling for Super304H steel oxide films in high temperature steam were investigated. With the oxidation proceeding, the surface of Super304H steel specimens is covered by a large amount of tiny holes, which causes the occurrence of an outer oxide layer. The Super304H oxide film generally has a double-layer structure: the outer layer mainly for iron oxide Fe3O4, also being covered by a small amount of Fe2O3, and the inner layer with the FeCr2O4 spinel phase as primary component. Because of the inhomogeneity of oxide distribution, large amounts of smaller gaps appear in the Super304H steel oxide films. Due to the differences among the outer layer, the inner layer and steel matrix in thermal expansion coefficient, when the steam temperature around the specimen changes periodically, the stress variation arise in the Super304H steel and oxide films, which causes the cracking and spalling of oxide films.
AB - In this paper, by means of Scanning Electronic Microscope (SEM), X-ray diffraction analyzer (XRD) and Cross hatch scanning analysis, the Structure and mechanism of cracking and spalling for Super304H steel oxide films in high temperature steam were investigated. With the oxidation proceeding, the surface of Super304H steel specimens is covered by a large amount of tiny holes, which causes the occurrence of an outer oxide layer. The Super304H oxide film generally has a double-layer structure: the outer layer mainly for iron oxide Fe3O4, also being covered by a small amount of Fe2O3, and the inner layer with the FeCr2O4 spinel phase as primary component. Because of the inhomogeneity of oxide distribution, large amounts of smaller gaps appear in the Super304H steel oxide films. Due to the differences among the outer layer, the inner layer and steel matrix in thermal expansion coefficient, when the steam temperature around the specimen changes periodically, the stress variation arise in the Super304H steel and oxide films, which causes the cracking and spalling of oxide films.
KW - Cracking and spalling
KW - High temperature steam
KW - Oxide films
KW - Super304H steel
UR - https://www.scopus.com/pages/publications/84898875849
U2 - 10.4028/www.scientific.net/AMR.908.72
DO - 10.4028/www.scientific.net/AMR.908.72
M3 - 会议稿件
AN - SCOPUS:84898875849
SN - 9783038350644
T3 - Advanced Materials Research
SP - 72
EP - 76
BT - Materials Science, Environment Protection and Applied Research
PB - Trans Tech Publications
T2 - 2nd International Conference on Environmental Science and Material Application, ESME 2014
Y2 - 22 March 2014 through 23 March 2014
ER -