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运用异质形核理论解释了钢中钙对夹杂物变性的机制过程,计算得出1 873 K下w[Al]s为0.03%时,均质形核生成Al2O3钢中溶解氧的质量分数需达到39.2×10-6,而当反应达到平衡后钢中溶解氧的质量分数为3.3×10-6。脱氧后加入钙靠均质形核很难生成CaO,钙、氧原子主要以Al2O3质点为核心在其表面上生成,生成反应为:[Ca]+(x+1/3)Al2O3=CaO.xAl2O3+2/3[Al],生成过程为Al2O3→CA6→CA2→CA→CxAy液相,并通过SEM/EDS验证了夹杂物变性的机制过程。
The heterogeneous nucleation theory is used to explain the mechanism of calcium in inclusions in steel. The calculated mass fraction of dissolved oxygen in homogenized nuclei-forming Al2O3 steel at w% of 1 873 K is 0.03% Reached 39.2 × 10-6, and when the reaction reached equilibrium steel dissolved oxygen mass fraction of 3.3 × 10-6. After deoxidation, it is very difficult to form CaO by homogeneous nucleation. Calcium and oxygen atoms are mainly formed on the surface of Al 2 O 3 as the core. The reaction is: [Ca] + (x + 1/3) Al 2 O 3 = CaO.xAl 2 O 3 +2 / 3 [Al]. The formation process is Al2O3 → CA6 → CA2 → CA → CxAy liquid phase. The mechanism of inclusion denaturation was verified by SEM / EDS.