矩形电磁冷坩埚连续铸造钛合金的成形性研究

在自行研制的多功能冷坩埚电磁约束定向凝固装置上进行了钛合金扁形锭的冷坩埚连续成形试验,考察了工艺参数变化对所成形钛合金锭成形性的影响.结果表明增大感应线圈匝数和增加加热功率可提高铸锭表面质量,但是提高抽拉速度和降低底料与线圈之间的相对位置会降低表面质量.在所研究的参数中,对铸锭表面质量影响的主次因素依次为感应线圈的匝数、加热功率、抽拉速度、底料相对线圈位置.在讨论这些参数的作用原理基础上,提出了可获得良好表面质量的工艺参数,获得了截面为矩形、表面光滑、无裂纹缺陷的钛合金矩形锭.

Shaping Process of Ti Slab in Continuous Casting with Rectangular Cold Crucible

We have developed a multi-function directional solidification apparatus with a rectangular cold crucible to conduct the continuously directional solidificationof titanium alloy slabs to examine the effects of processing variables on shaping ability of Ti alloy slabs. The results show that the surface quality of the ingot can be improved with increasing in coil turns and input power while it becomes deteriorated with raising the drawing velocity and lowering the relative position of pedestal to the induction coils. The influential order among the investigated processing variables on surface quality is found to be: the first one is the induction coils, then the input power, the drawing velocity, and the pedestal position. By controlling the appropriate technological parameters, the rectangular slabs free from cracks and ripples can be obtained.