Feasibility analysis of modified AL-6XN steel for structure component application in supercritical water-cooled reactor

doi:10.1007/s11708-009-0030-0

Front Energ Power Eng Chin

2009, Vol. 3

Issue (2) : 193-197 https://doi.org/10.1007/s11708-009-0030-0

RESEARCH ARTICLE

Feasibility analysis of modified AL-6XN steel for structure component application in supercritical water-cooled reactor

Xinggang LI(

), Qingzhi YAN, Rong MA, Haoqiang WANG, Changchun GE

Institute of Nuclear Materials, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Modified AL-6XN austenite steel was patterned after AL-6XN superaustenitic stainless steel by introducing microalloy elements such as zirconium and titanium in order to adapt to recrystallizing thermo-mechanical treatment and further improve crevice corrosion resistance. Modified AL-6XN exhibited comparable tensile strength, and superior plasticity and impact toughness to commercial AL-6XN steel. The effects of aging behavior on corrosion resistance and impact toughness were measured to evaluate the qualification of modified AL-6XN steel as an in-core component and cladding material in a supercritical water-cooled reactor. Attention should be paid to degradation in corrosion resistance and impact toughness after aging for 50 hours when modified AL-6XN steel is considered as one of the candidate materials for in-core components and cladding tubes in supercritical water-cooled reactors.

Keywords supercritical water cooled reactor tensile impact toughness corrosion aging

Corresponding Author(s): LI Xinggang,Email:xing-gangli@163.com

Issue Date: 05 June 2009

Cite this article:

Xinggang LI,Qingzhi YAN,Rong MA, et al. Feasibility analysis of modified AL-6XN steel for structure component application in supercritical water-cooled reactor[J]. Front Energ Power Eng Chin, 2009, 3(2): 193-197.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-009-0030-0
https://academic.hep.com.cn/fie/EN/Y2009/V3/I2/193

Tab.1 Chemical composition of AL-6XN []

Fig.1 Mass fraction of sigma phase and austenite (FCC_A1) vs temperature based on Thermo-Calc calculation

Fig.2 Microstructure of Mod AL-6XN steel

Fig.3 Comparison in tensile properties between Mod AL-6XN and commercial AL-6XN steel

Fig.4 Absorbed energy as a function of temperature in different heat-treated conditions
W.C.—water cooling; A.C. —air cooling

Fig.5 SEM image of microstructure of Mod AL-6XN after aging for 50 hours and exposure in aqua regia for 15 minutes

Fig.6 EDS analyses of polished and etched surface of Mod AL-6XN steel after aging for 50 hours
(a) The matrix; (b) precipitates along the grain boundary

Fig.7 Morphologies of polished surface of Mod AL-6XN with different heat treatments etched in aqua regia for 1 hour
(a) 1150°C 30 min; (b) 1150°C 60 min+600°C 26 h; (c) 1150°C 30 min+600°C 50 h

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