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利用板坯连续定向凝固装置(OCC)制备了纯铝板坯,研究了工艺参数对板坯表面质量和凝固组织的影响,并对影响裂纹产生的因素进行了分析。结果表明,在拉速为5mm/min,冷却水流量为220L/h,结晶器上部温度为694℃,结晶器出口温度为668℃时,可制备出表面质量较好的连续生长的柱状晶组织的纯铝板坯。用连续定向凝固方法制备的纯铝板坯表面缺陷主要有板面上横裂纹和角部横裂纹两种,其长度从10mm到30mm不等,深度最大可达4mm,且表面横裂纹的分布方式各异,有轴向、径向平行分布和局部横裂纹等。
The pure aluminum slabs were prepared by continuous directional solidification equipment (OCC) of slab. The effects of technological parameters on the slab surface quality and solidified structure were studied. The factors affecting the crack generation were analyzed. The results show that the columnar crystal structure with continuous surface growth with good surface quality can be obtained at the speed of 5mm / min, the flow rate of cooling water of 220L / h, the temperature of the upper mold 694 ℃ and the outlet temperature of the mold 668 ℃ Pure aluminum slab. The surface defects of pure aluminum slabs prepared by continuous directional solidification method are mainly two kinds of transverse cracks on the plate surface and corner transverse cracks, ranging from 10mm to 30mm in length and up to 4mm in depth. The distribution of surface transverse cracks Different, with axial and radial parallel distribution and local horizontal cracks.