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通过试验和热力学计算研究了冷却速率对高锰TWIP钢中夹杂物演变规律的影响。高锰TWIP钢中夹杂物可分为9类:(Ⅰ)AlN、(Ⅱ)MgO、(Ⅲ)CaS、(Ⅳ)MgAl2O4、(Ⅴ)AlN+MgO、(Ⅵ)MgO+MgS、(Ⅶ)MgO+MgS+CaS、(Ⅷ)MgO+CaS、(Ⅸ)MgAl2O4+MgS。冷却速率为4.83℃/s时,钢中夹杂物类型为(Ⅰ)、(Ⅱ)和(Ⅳ)~(Ⅸ),而冷却速率为0.75℃/s时,钢中夹杂物类型为(Ⅰ)~(Ⅲ)、(Ⅴ)和(Ⅷ)。随着冷却速率的增大,钢中夹杂物的体积分数和面积分数几乎不变,夹杂物尺寸减小,数量密度增大。随着冷却速率的增大,AlN的尺寸、数量密度与面积分数的变化趋势与上述相同。通过热力学计算得到的夹杂物类型与实际观察结果基本一致。
The effects of cooling rate on the evolution of inclusions in high-manganese TWIP steel were studied by experiments and thermodynamic calculations. The inclusions in high manganese TWIP steel can be divided into nine categories: (Ⅰ) AlN, (Ⅱ) MgO, (Ⅲ) CaS, (Ⅳ) MgAl2O4, (V) AlN + MgO, MgO + MgS + CaS, (VIII) MgO + CaS, (IX) MgAl2O4 + MgS. The types of inclusions in steel are (Ⅰ), (Ⅱ) and (Ⅳ) ~ (Ⅸ) when the cooling rate is 4.83 ℃ / s and the inclusions in steel are (Ⅰ) at the cooling rate of 0.75 ℃ / ~ (Ⅲ), (Ⅴ) and (Ⅷ). With the increase of cooling rate, the volume fraction and area fraction of inclusions in steel almost does not change, the size of inclusions decreases and the number density increases. With the increase of cooling rate, the trend of AlN size, number density and area fraction is the same as above. The types of inclusions calculated by thermodynamics are basically consistent with the actual observations.