Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water

Mengqiang Gong, Zhangjian Zhou, Helong Hu, Sami Penttilä, Aki Toivonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The corrosion behavior and oxide layer structure of two 14Cr ODS (Oxide Dispersion Strenghtened) steels with or without alloying element of Al have been investigated in supercritical water (SCW) at 650℃/25MPa for exposure times of 100h, 300h and 1000h. The oxide structure was studied using scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Both ODS alloys showed a three-layer oxide structure after 1000h of exposure in SCW. The 14Cr-Al samples exhibited a structure with Fe2O3 in the outer layer, a mixture of (Cr, Fe)3O4 and (Al,Cr)2O3 in the inner layer, and a mixture of metal and oxide grains Al2O3 in the diffusion layer. The outer layer of Al-free samples consist of Fe2O3, the inner layer and the diffusion layer contain (Fe, Cr)3O4 and Cr2O3, respectively. Cracks, pores and exfoliations could be observed for both alloys after SCW exposure up to 1000h.
Original languageEnglish
Title of host publication Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)
PublisherVTT Technical Research Centre of Finland
Number of pages9
ISBN (Electronic)978-951-38-8289-1
ISBN (Print)978-951-38-8290-7
Publication statusPublished - 2015
MoE publication typeB3 Non-refereed article in conference proceedings
Event7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7 - Helsinki, Finland
Duration: 15 Mar 201518 Mar 2015

Publication series

SeriesVTT Technology
Number216

Conference

Conference7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7
Abbreviated titleISSCWR-7
CountryFinland
CityHelsinki
Period15/03/1518/03/15

Fingerprint

corrosion
steels
oxides
water
alloying
cracks
electron microscopes
porosity
scanning
diffraction
metals
spectroscopy
x rays

Cite this

Gong, M., Zhou, Z., Hu, H., Penttilä, S., & Toivonen, A. (2015). Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. In Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015) [2059] VTT Technical Research Centre of Finland. VTT Technology, No. 216
Gong, Mengqiang ; Zhou, Zhangjian ; Hu, Helong ; Penttilä, Sami ; Toivonen, Aki. / Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland, 2015. (VTT Technology; No. 216).
@inproceedings{251649cd35574a09b266821cd0dcdd92,
title = "Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water",
abstract = "The corrosion behavior and oxide layer structure of two 14Cr ODS (Oxide Dispersion Strenghtened) steels with or without alloying element of Al have been investigated in supercritical water (SCW) at 650℃/25MPa for exposure times of 100h, 300h and 1000h. The oxide structure was studied using scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Both ODS alloys showed a three-layer oxide structure after 1000h of exposure in SCW. The 14Cr-Al samples exhibited a structure with Fe2O3 in the outer layer, a mixture of (Cr, Fe)3O4 and (Al,Cr)2O3 in the inner layer, and a mixture of metal and oxide grains Al2O3 in the diffusion layer. The outer layer of Al-free samples consist of Fe2O3, the inner layer and the diffusion layer contain (Fe, Cr)3O4 and Cr2O3, respectively. Cracks, pores and exfoliations could be observed for both alloys after SCW exposure up to 1000h.",
author = "Mengqiang Gong and Zhangjian Zhou and Helong Hu and Sami Penttil{\"a} and Aki Toivonen",
year = "2015",
language = "English",
isbn = "978-951-38-8290-7",
series = "VTT Technology",
publisher = "VTT Technical Research Centre of Finland",
number = "216",
booktitle = "Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)",
address = "Finland",

}

Gong, M, Zhou, Z, Hu, H, Penttilä, S & Toivonen, A 2015, Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. in Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)., 2059, VTT Technical Research Centre of Finland, VTT Technology, no. 216, 7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7, Helsinki, Finland, 15/03/15.

Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. / Gong, Mengqiang; Zhou, Zhangjian; Hu, Helong; Penttilä, Sami; Toivonen, Aki.

Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland, 2015. 2059 (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water

AU - Gong, Mengqiang

AU - Zhou, Zhangjian

AU - Hu, Helong

AU - Penttilä, Sami

AU - Toivonen, Aki

PY - 2015

Y1 - 2015

N2 - The corrosion behavior and oxide layer structure of two 14Cr ODS (Oxide Dispersion Strenghtened) steels with or without alloying element of Al have been investigated in supercritical water (SCW) at 650℃/25MPa for exposure times of 100h, 300h and 1000h. The oxide structure was studied using scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Both ODS alloys showed a three-layer oxide structure after 1000h of exposure in SCW. The 14Cr-Al samples exhibited a structure with Fe2O3 in the outer layer, a mixture of (Cr, Fe)3O4 and (Al,Cr)2O3 in the inner layer, and a mixture of metal and oxide grains Al2O3 in the diffusion layer. The outer layer of Al-free samples consist of Fe2O3, the inner layer and the diffusion layer contain (Fe, Cr)3O4 and Cr2O3, respectively. Cracks, pores and exfoliations could be observed for both alloys after SCW exposure up to 1000h.

AB - The corrosion behavior and oxide layer structure of two 14Cr ODS (Oxide Dispersion Strenghtened) steels with or without alloying element of Al have been investigated in supercritical water (SCW) at 650℃/25MPa for exposure times of 100h, 300h and 1000h. The oxide structure was studied using scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Both ODS alloys showed a three-layer oxide structure after 1000h of exposure in SCW. The 14Cr-Al samples exhibited a structure with Fe2O3 in the outer layer, a mixture of (Cr, Fe)3O4 and (Al,Cr)2O3 in the inner layer, and a mixture of metal and oxide grains Al2O3 in the diffusion layer. The outer layer of Al-free samples consist of Fe2O3, the inner layer and the diffusion layer contain (Fe, Cr)3O4 and Cr2O3, respectively. Cracks, pores and exfoliations could be observed for both alloys after SCW exposure up to 1000h.

M3 - Conference article in proceedings

SN - 978-951-38-8290-7

T3 - VTT Technology

BT - Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)

PB - VTT Technical Research Centre of Finland

ER -

Gong M, Zhou Z, Hu H, Penttilä S, Toivonen A. Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. In Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland. 2015. 2059. (VTT Technology; No. 216).