Microstructure understanding of high Cr-Ni austenitic steel corrosion in high-temperature steam

被引：75
|
作者：
Shen, Zhao [1 ,2 ]
Zhang, Jianqiang [3 ]
Wu, Shengchuan [4 ]
Luo, Xiaonan [5 ]
Jenkins, Benjamin M. [5 ]
Moody, Michael P. [5 ]
Lozano-Perez, Sergio [5 ]
Zeng, Xiaoqin [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[3] Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
[4] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China
[5] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England
来源：
ACTA MATERIALIA | 2022年 / 226卷
基金：
英国工程与自然科学研究理事会;
关键词：
High Cr-Ni austenitic steel; Internal oxidation; Multilayers; Transmission electron microscopy; Transmission Kikuchi diffraction; FERRITIC-MARTENSITIC STEEL; 316L STAINLESS-STEEL; IRON-CHROMIUM ALLOYS; BI EUTECTIC ALLOY; WATER-VAPOR; SUPERCRITICAL WATER; OXIDATION BEHAVIOR; INTERNAL OXIDATION; CRACKING SUSCEPTIBILITY; EXPOSURE TEMPERATURE;
D O I：
10.1016/j.actamat.2022.117634
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and microchemistry of the oxide scales formed on Fe-21Cr-32Ni and Fe-17Cr-9Ni steels after exposure to deaerated high-temperature high-pressure steam at 60 0 & DEG;C for 150 0 h have been analysed and compared by several advanced characterization techniques. By comparing the oxide scales formed at different-stages of exposure, it is shown that Fe-21Cr-32Ni steel was internally oxidized at the early-stage, and then an external oxide scale was developed together with an inner chromia band under the internal oxidation zone. In comparison, Fe-17Cr-9Ni steel was internally oxidized together with an ex-ternal Fe-rich oxide scale during the entire experimental period. The thicknesses of the internal oxidation zone of Fe-21Cr-32Ni and Fe-17Cr-9Ni steels were-7 and-70 mu m, respectively. Further characterisation revealed that the internal oxidation zone contained (Cr, Fe, (Ni))3O4 and nanoscale nickel networks, to-gether with numerous nano-pores. The effects of these structures on mass transfer and reaction product formation were discussed, in connection with the alloy composition and the formation of the chromia layer.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：20
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