摘要
利用砂型样杯取代传统的金属型样杯制作了铝合金减压凝固试样．结果表明，该试样可以预测铝合金铸件的氢针孔级别，控制铝合金的熔炼质量．测试仪器中还设置了预真空室，可使凝固室在最短的时间内达到预定的真空度，提高测试精度．试验还发现合适的砂型减压凝固压力约为1．13kPa．
The RPS (sample solidified under reduced pressure) was made of a sandsample cup with which the conventional preheated metallic sample cup was substituted.As a result, the hydrogen blow hole degree of aluminium alloy casting can be predictedby the RPS' density and the quality of the melt can be controlled. Moreover a prevacuumizedchamber is designed in the test apparatus, and the solidification chamber may reach thereduced pressure value in the shortest time so that the more exact test can be done. Theproperly reduced pressure of solidification with sand cup is about 11.3 kpa.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1997年第5期446-450,共5页
Journal of University of Science and Technology Beijing
关键词
减压凝固
氢气孔
铝合金
铸造
减压试样密度
density, reduced pressure solidiflcation, hydrogen blow hole, aluminium alloy
