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Report No.

EPMA analysis of multi-component interaction products between boron carbide and stainless steel under a postulated core disruptive accident in SFR

Nakamura, Kinya*; Ota, Hirokazu*; Takai, Toshihide  ; Yamano, Hidemasa   

To investigate in-depth redistribution behavior of the constituent elements of B$$_{4}$$C and SS, electron probe microanalysis was applied to the multi-component interaction products held at 1500$$^{circ}$$C for 8 min approximately in argon gas atmosphere in this study. The results indicated that relatively low-density boron was preferentially diffused the upper surface of the molten SS horizontally to form acicular and high melting point compound (Cr,Fe)$$_{2}$$B along with the eutectic microstructure composed of (Fe,Cr,Ni) solid solution and (Cr,Fe)$$_{2}$$B. According to the macroscopic quantitative analysis, average chemical concentration of boron is almost uniform in the horizontal direction regardless of the distance from the B$$_{4}$$C pellet but decreased toward the bottom in the molten SS monotonously in the vertical direction.



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