“…The assessed maximum solubility of P in γ-Fe is ca 0.56% at 1423 K. 2,12 The liquidus and solidus of α-Fe were measured by many researchers. 9,11, [16][17][18][19] The quantitative values of solid solubility of P in α-Fe were obtained by using metallography, 11,12,17,20 X-ray analysis, 21,22 precipitation hardening, 23 lattice parameter measurements, 24 electron probe analysis, 25 microprobe and micro-hardness tests, 26 and X-ray microanalyzer. 27 The experimental results obtained from different investigators established that three invariant reactions exist in the Fe-P system, i.e., L⇌α-Fe+Fe3P, L+Fe2P⇌Fe3P, and L⇌Fe2P+ FeP.…”