电子束冷床炉熔炼超长超薄TC4铸锭过程中坩埚的尺寸设计

Design of crucible’s size during EBCHM for ultra-long and ultra-thin TC4 ingot

摘要:

钛锭固液界面形貌对其凝固组织有着很大的影响。本文研究了超长超薄TC4扁锭EB炉熔炼中结晶器三维尺寸对固液界面形貌的影响。结果表明:当TC4扁锭截面长度超过450mm时，结晶器的冷却能力不再增加。当长度超过有效距离时，随着结晶器长度的增加，熔池深度和糊状区宽度不再发生改变。此外，提高结晶器的长宽比有利于提高TC4扁锭的表面质量。计算结果表明，结晶器内长和内宽比应在4:1和6:1之间。当结晶器高度大于300mm时，熔池深度和糊状区宽度不变。因此，通过本文研究可以为EBCHM熔炼超长超薄TC4扁锭的结晶器三维设计提供一定的设计依据。

关键词:超长超薄钛锭;连续凝固;固液界面;结晶器尺寸

Abstract:

Solid-liquid interface morphology of the titanium ingot has great influence on the microstructure during the solidification process. This paper focused on the effect of Crystallizer"s 3D dimension of the ultra-long and ultra-thin TC4 slab ingot on the solid-liquid interface morphology. The results show that when the cross-section length of TC4 slab ingot exceeds 450mm, the cooling capacity of the crystallizer does not increase. When the length exceeds the effective distance, the depth of molten pool and the width of mushy zone will not change with the increase of the length in the crystallizer. Moreover, increasing the ratio of the crystallizer’s length to width is helpful to improve the production quality. The simulation results show that it is better to choose between 4:1 and 6:1. When the height of the crystallizer is higher than 300mm, the depth of the molten pool and the width of mushy zone will not change. Therefore, the certain range theoretical basis was obtained to design the crystallizer’s three-dimension during EBCHM for the ultra-long and ultra-thin TC4 slab ingot.

Key words:ultra-long and ultra-thin titanium ingot; continuous casting; solid-liquid interface; crystallizer dimension