摘 要 钢中钛氧超细夹杂物对提高钢材性能具有重大意义。本工作采用单向凝固法模拟了凝固过程中二次枝晶臂间溶质富集时钛氧夹杂物的析出情况，从而考察出冷却速率对钛氧超细夹杂物尺寸、数量及分布的影响，进而验证出凝固过程微观偏析和钛氧夹杂生成耦合模型的准确性。单向凝固实验结果表明，冷却速率增高钛氧夹杂尺寸减小、数量增多、分布更为均匀。在10k/min（模铸）、100k/min（方坯）、200k/min（中厚板）冷却速率下夹杂平均直径分别为1.87μm、1.09μm、0.82μm，单位体积夹杂数量分别为0.31×104mm-3、1.98×104mm-3和3.27×104mm-3，进而论证出利用凝固过程溶质富集来析出钛氧超细夹杂物是可行的。
ABSTRACT Superfine Ti-O inclusions are of great importance for the quality of steel.This work adopts directional solidification method to simulate the precipitation of inclusions because of solute enrichment between secondary dendrite, thereby investigates the effect of cooling rate on the size and number of Ti—O inclusions, furthermore verifies a coupled model of microsegregation and Ti-O inclusion precipitation during solidification of liquid steel. The experimental results indicate that the inclusion size is minished, the number is increased and the distribution is more symmetrical when enhancing cooling rates.The average diameters of inclusions are 1.86μm,1.17μm and 0.84μm,the numbers per unit volume are 0.31×104mm-3,1.98×104mm-3 and 3.27×104mm-3 when the cooling rates are 10k/min,100k/min and 200k/min,furthermore it has been proved that superfine inclusions precipitated during solidification is feasible.
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| [3] | |
| [4] | |
| [5] | |
| [6] |
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