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采用电子束冷床炉熔炼了大规格纯钛扁锭(8 000mm×1 050mm×210mm),研究了结晶器中熔体表面温差对钛扁锭中Fe元素偏析的影响机理及控制方法。结果表明,电子枪对结晶器中熔体表面扫描功率的分配比不合理,会使得熔体表面产生温度不均匀和局部过热现象,导致随着熔体表面平均温差的增大,扁锭中Fe含量越低,且横向偏析越严重;当电子枪对结晶器中熔体表面扫描功率分配比为32%、28%、40%时,熔体表面平均温差最小,钛扁锭中Fe元素偏析程度最小,轧制成钛带卷后力学性能均匀。
A large size pure titanium ingot (8 000 mm × 1 050 mm × 210 mm) was smelted by electron beam cooling bed furnace. The influence mechanism of melt temperature difference on the segregation of Fe in titanium ingot and the control method were studied. The results show that the distribution ratio of the electron gun to the scanning power of the melt surface in the mold is unreasonable, which leads to the temperature unevenness and local overheating on the melt surface. As the average temperature difference on the melt surface increases, the content of Fe in the slab And the more the transverse segregation is more serious. When the electron gun scanning power distribution ratio is 32%, 28%, 40% on the melt surface of the mold, the average temperature difference of the melt surface is the smallest, the segregation degree of Fe element in the titanium slab is the smallest, After rolling into titanium coil, the mechanical properties are even.