scholarly journals Microstructural Investigation of LME Crack Initiated in Ferritic/Martensitic Steel T91 Loaded in Liquid Lead-Bismuth Eutectic at 300 °C

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 38
Author(s):  
Patricie Halodová ◽  
Jan Lorinčík ◽  
Anna Hojná
Keyword(s):  
Liquid Metal ◽  
Martensitic Steel ◽  
Ion Beam ◽  
Mechanical Strain ◽  
Metal Corrosion ◽  
Liquid Lead ◽  
Extension Rate ◽  
Irradiation Embrittlement ◽  
Microstructural Investigation ◽  
Lead Bismuth Eutectic

Liquid lead-bismuth eutectic (LBE) is one of the candidate materials for advanced nuclear systems. The structural materials used in contact with LBE are selected according to the resistance to liquid metal corrosion, irradiation embrittlement, and compatibility with the coolant. However, simultaneous presence of mechanical strain and LBE environment can induce liquid metal embrittlement (LME) in these materials. In this study, a specimen from candidate ferritic-martensitic steel T91 was tested by Constant Extension Rate Tensile (CERT) test exposed to PbBi environment with oxygen concentration 6 × 10−6 wt % at 300 °C up to rupture. Post-test examination using scanning electron microscopy (SEM) showed a deep crack indicating features of LME in the plastic strained region of the tested specimen. Further investigations focused on characterization of the fracture path and microstructure determination using focused ion beam (FIB) and energy dispersive X-ray spectrometry/electron backscatter diffraction (EDX/EBSD). This observation revealed that the dominant LME failure mode of the observed crack is translath or transgranular and the crack stopped at the high-angle grain boundary. The role of oxides in the crack initiation is discussed.

Study of the Influence of Surface Finishing on the Corrosion/Oxidation Behaviour of Stainless Steels in Stagnant Lead Bismuth Eutectic

2009 ◽  
Author(s):  
F. J. Marti´n-Mun˜oz ◽  
L. Soler-Crespo ◽  
D. Go´mez-Bricen˜o
Keyword(s):  
Liquid Metal ◽  
Surface States ◽  
Metal Corrosion ◽  
Surface Finishing ◽  
Metal Interface ◽  
Spallation Target ◽  
Metallic Compounds ◽  
Lead Bismuth Eutectic ◽  
Evolution With Time ◽  
Effect Of Surface

Lead-bismuth eutectic (LBE) is of interest as a coolant in the design of fast reactors and also as both a coolant and a spallation target in proposed transmutation schemes for radioactive waste. However, liquid metal corrosion to the structural materials can proceed via various processes: species dissolution, formation of the inter-metallic compounds at the steels/liquid metal interface... It is known that the formation of an oxide scale on a steel surface can protect it dissolution attack by liquid LBE. The variables that play an important role on the feasibility of the formation of an oxide layer and on its protective characteristics for steels in contact with LBE are oxygen content, temperature, materials composition and evolution with time, but also surface state of steels prior to testing or weld joints, being these parameters not very widely studied. For the study of the influence of the surface finishing, specimens with different surface states were prepared (as-received, grinded, grinded and polished and electrolitically polished). These treatments gave to the materials a different degree of cold working, the higher for the mechanised samples and the lowest for the electrolitically polished. Tests were carried out at 500 and 550°C from 100 to 2000 hours with two different H2/H2O ratios: 3 and 0.03. The general conclusion is that the effect of surface finishing on the corrosion/protection processes is not significant for the conditions tested.

Quantification of the Long-Term Performance of Steels T91 and 316L in Oxygen-Containing Flowing Lead-Bismuth Eutectic at 550°C

2010 ◽  
Vol 132 (8) ◽  
Author(s):  
Carsten Schroer ◽  
Juergen Konys
Keyword(s):  
Liquid Metal ◽  
Dissolved Oxygen ◽  
Martensitic Steel ◽  
Metal Flow ◽  
Liquid Metal Flow ◽  
Lead Bismuth Eutectic ◽  
Long Term Performance ◽  
Term Performance

The long-term performance of ferritic/martensitic steel T91 and austenitic 316L in oxygen-containing flowing lead-bismuth eutectic at 550°C was investigated by exposing the materials for up to 15,000 h in the CORRIDA loop. The velocity of the liquid-metal flow was 2 m/s and the concentration of dissolved oxygen averaged 1.6×10−6 mass %. The resulting corrosion processes and products were analyzed and quantified using metallographic methods.

Degradation of HT9 under simultaneous ion beam irradiation and liquid metal corrosion

2016 ◽  
Vol 479 ◽  
pp. 382-389 ◽  
Author(s):  
D. Frazer ◽  
S. Qvist ◽  
S. Parker ◽  
D.L. Krumwiede ◽  
M. Caro ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Ion Beam ◽  
Metal Corrosion ◽  
Beam Irradiation ◽  
Ion Beam Irradiation
Sign in / Sign up

Export Citation Format

Share Document