Solubility of Nitrogen in High Manganese Steel (HMnS) Melts: Interaction Parameter between Mn and N

Abstract

Nitrogen solubility in Fe-Mn melts was measured using a N 2 bubbling and sampling method at temperatures from 1823 K to 1923 K (1550°C to 1650°C) for manganese content to about 25 mass pct. The effect of temperature on the nitrogen solubility was well described based on the thermodynamic behavior of Fe-Mn system. Furthermore, the interaction parameter between Mn and N was evaluated as a function of temperature. The present results can be used in thermodynamic analyses of the formation of nitride compounds such as AlN or TiN in high manganese steel melts for example, transformation induced plasticity (TRIP) and twin induced plasticity (TWIP) aided steels as well as high Mn-N alloyed stainless steels.

Thermodynamics of Nitrogen Solubility and AlN Formation in Multi-Component High Mn Steel Melts

“…2 together with previous data determined in the similar temperature range. 5,11,[15][16][17][18][19] The present experimental results agree well with the previous data over the wide range of Mn content up to 25 mass%, and the N solubility increases more significantly with Mn content at high concentration in Fe-Mn melt.…”

“…Several groups including the present authors reported only the firstorder interaction parameter values of Mn on N, e N Mn in the range of − 0.02 ~ − 0.0245 for Fe-Mn-N melt containing manganese up to 26 mass% in the temperature range of 1 773-1 973 K as shown in Table 2. 5,11,[15][16][17][18][19] Recently, Senk et al 15) Table 2 for the best agreement of their nitrogen solubility. However, their data at low and high nitrogen partial pressures showed big scatters.…”

Thermodynamics of Nitrogen in Fe-Mn-Al-Si-C Alloy Melts

“…The temperature dependence of the solubility changes from positive to negative at about 8.5 wt pct of Mn in this temperature range. Shin et al [71] 's results measured by N 2 bubbling and sampling method clearly showed the effect of Mn on the N solubility in liquid iron and its temperature dependence. The predicted N solubility from the present model is compared to more experimental data in Figure 7.…”

“…Figure 6 shows the N solubility in liquid Fe-Mn alloys measured by various investigators [4,33,[71][72][73][74] at the temperatures from about 1823 K to 1923 K (1550°C to 1650°C) under (a) 1 and (b) 0.3 atm N 2 partial pressures. As shown in the figure, the N solubility significantly increases with increasing Mn content.…”

Density Measurements of CaO^|^ndash;MnO^|^ndash;SiO2 Slags

“…TRIP and TWIP steels), many studies have been performed on thermodynamic and thermo-physical properties of manganese alloys and MnO-based slags. [2][3][4][5][6][7] Density is one of the fundamental physical properties at high temperatures not only for the process optimization but also for the measurements of other physical properties such as surface tension. Several research works have been reported on the density measurements of Fe-Mn alloys, 6,7) but not so many works on MnO-based slag systems.…”