Temperature dependence of liquid metal embrittlement susceptibility of a modified 9Cr-1Mo steel under low cycle fatigue in lead-bismuth eutectic at 160-450 °C

被引：40

作者：

Gong, Xing ^{[1
,2
]}

Marmy, Pierre ^{[1
]}

Qin, Ling ^{[2
]}

Verlinden, Bert ^{[2
]}

Wevers, Martine ^{[2
]}

Seefeldt, Marc ^{[2
]}

机构：

[1] CEN SCK, Belgian Nucl Res Ctr, B-2400 Mol, Belgium

[2] Katholieke Univ Leuven, Dept Mat Engn MTM, B-3001 Heverlee, Belgium

来源：

JOURNAL OF NUCLEAR MATERIALS | 2016年 / 468卷

关键词：

Liquid metal embrittlement; 9Cr-1Mo steel; Lead-bismuth eutectic (LBE); Low cycle fatigue; Fatigue endurance trough; FERRITIC-MARTENSITIC STEEL; POTENTIOMETRIC OXYGEN SENSORS; RATE TENSILE TESTS; STRAIN-RATE; T91; STEEL; FERRITIC/MARTENSITIC STEELS; MECHANICAL-BEHAVIOR; LBE; LME; ENVIRONMENT;

D O I：

10.1016/j.jnucmat.2015.06.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low cycle fatigue properties of a 9Cr-1Mo ferritic-martensitic steel (T91) have been tested in a low oxygen concentration (LOC) lead-bismuth eutectic (LBE) environment and in vacuum at 160-450 degrees C. The results show a clear fatigue endurance "trough" in LOC LBE, while no such a strong temperature dependence of the fatigue endurance is observed when the steel is tested in vacuum. The fractographic observations by means of scanning electron microscopy (SEM) show that ductile microdimples are prevalent on the fracture surfaces of the specimens tested in vacuum, whereas the fracture surfaces produced, in LOC LBE at all the temperatures are characterized by quasi-cleavage. Interestingly, using electron backscatter diffraction (EBSD), martensitic laths close to the fatigue crack walls or to the fracture surfaces of the specimens tested in vacuum are found to have transformed into very fine equiaxed subgrains. Nevertheless, such microstructural modifications do not happen to the specimens tested in LOC LBE at 160-450 degrees C. These interesting microstructural distinctions indicate that liquid metal embrittlement (LME) is able to occur throughout the fatigue crack propagation phase in the full range of the temperatures investigated, i.e. LME is not very sensitive to temperature during the fatigue crack propagation. (c) 2015 Elsevier B.V. All rights reserved.

引用

页码：289 / 298

页数：10

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