航空学报 > 1988, Vol. 10 Issue (10): 484-490

HRS定向凝固过程中固/液界面位置控制

张克福, 毛协民, 傅恒志   

  1. 西北工业大学
  • 收稿日期:1987-12-07 修回日期:1900-01-01 出版日期:1988-10-25 发布日期:1988-10-25

CONTROL OF SOLID/LIQUID INTERFACE POSITION ON DIRECTIONAL SOLIDIFICATION PROCESS

Zhang Kefu, Mao Xiemin, Fu Hengzhi   

  1. Northwestern Polytechnical University
  • Received:1987-12-07 Revised:1900-01-01 Online:1988-10-25 Published:1988-10-25

摘要: 本文通过在计算机上模拟固/液界面位置受到控制的整个HRS定向凝固过程、求出使固/液界面稳定在隔热板及其附近时抽拉速度的调节规律。依此规律,利用一个以TP 801 B单板机为核心的控制系统对铸件的HRS定向凝固过程进行实时控制。用Al—4.5%Cu合金试样进行了验证试验。结果表明:受控HRS定向中、固/液界面很快趋近于隔热板并在定向过程中稳定在隔热板附近。对界面位置实行控制能有效提高固/液界面前沿温度梯度及其稳定性明显改善定向凝固显微组织。

Abstract: The adjusting law of withdrawal speed that made the solid/liquid interface position locate near the insulating plate stably was obtained bv simulating the whole mode-withdrawal type directional solidification process in which the interface was controlled by a computer. The control system based on single-board computer TP801B was built to control the directional solidification process on line using the law obtained above. Experimental results for an Al-4.5%wt Cu alloy show that the solid/liquid interface was based to insulating plate quickly and located near it stably throught the whole process. The results also show that this technique was effective in raising the stability, it was also effective in improving the microstructure of directionally solidified castings.