Fundamental experiments on phase stabilities of Fe-B-C ternary systems

Sudo, Ayako ; Nishi, Tsuyoshi; Shirasu, Noriko  ; Takano, Masahide ; Kurata, Masaki 

Although Fe-B-C ternary system is a dominant phase diagram when considering the control blade degradation, phase relation data around eutectic composition were not sufficient. The phase relations of three Fe-B-C samples were analyzed by XRD and SEM/EDX and solidus were determined by DTA. The solidus detected in the present study was maintained at about 1400 K for all three samples, although preliminary calculation using conventional thermodynamic database estimated that solidus varies with roughly 50 K difference. The difference might be originated from the insufficient evaluation on the phase stability of Fe(B,C) in the database. The present results give useful information on improvement of iron-boron-carbon phase diagram.