Effect of Si Alloying on Liquid Metal Embrittlement Susceptibility of 10Cr Ferritic/martensitic Steel in Liquid Lead-bismuth Eutectic
Ferritic/martensitic(F/M)steels are one of most promising candidate materials for the fuel cladding and other reactor core internals of Gen Ⅳ liquid PbBi cooled fast reactors.Alloying Si into F/M steels is a key technological measure that has been taken by the laboratories worldwide to improve the corrosion resistance of F/M steels exposed to the liquid lead-bismuth eutectic(LBE),there is insufficient information on how Si alloying affects the liquid metal embrittlement susceptibility of the steel.In this work,the effects of alloying four different Si contents on the tensile mechanical behavior and LME susceptibility of the 10Cr F/M steels in oxygen-poor or-saturated LBE and argon(Ar)have been investigated,in collaboration with fractographic examinations.The results showed that the LBE environment had little effect on the yield strength and the ultimate tensile strength at all Si contents,while the total elongation to failure was significantly reduced in presence of LBE.Yield strength is not affected much by Si alloying,while the ultimate tensile strength exhibited a slightly increasing trend.The total elongation to failure was strongly dependent on Si content.In Ar environment,the total elongation to failure increases with the increase of Si content,while a reverse trend was observed in the LBE environment.All results suggest that the LME susceptibility was promoted by Si alloying.
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