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Phase Diagrams

Solubility of Nitrogen in Liquid Iron Alloys

Since the early 1960's it has been known that nitrogen, when dissolved in liquid iron at 1600 °C (2912 °F), obeys Sieverts's law:

[wt. % N] = k·(pnitrogen)1/2

where k = 0.045 (at 1600 °C).

Figure 1 shows the effects of the presence of a second dilute solute on the solubility of nitrogen in liquid binary iron alloys at the pressure of 101325 Pa (14.69 psi) and the temperature of 1600 °C (2912 °F). The diagram was calculated with Thermo-Calc, coupled with TCFE2000 steel thermodynamic database.

Solubility of Nitrogen in Liquid Binary Iron Alloys at 101325 Pa and 1600 degrees Celsius

Figure 1. The effect of alloying elements (carbon, nickel, molybdenum, manganese, and chromium) on the solubility of nitrogen at 101325 Pa (14.69 psi) pressure in liquid binary iron alloys at 1600 °C (2912 °F).

The effects of alloying elements (e.g., carbon, silicon, cobalt, nickel, copper, tungsten, molybdenum, manganese, chromium, vanadium, niobium, etc) on the solubility of nitrogen at any pressure in any liquid iron-based alloy (such as carbon steel, stainless steel, tool steel, high-speed steel, for example) can be predicted through thermodynamic calculations.

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