CAJ | 학술논문

合金凝固过程的收缩会使铸件产生缩孔、缩松、热裂、应力和冷裂等缺陷．运用阿基米德原理设计了测定合金凝固收缩率的实验装置，并研究了Al-25％ Si合金凝固收缩率随熔体温度处理和合金化元素的变化规律．试验结果发现：Al-25％ Si合金凝固收缩率随过热温度的升高先减小后增大，随降温后保温时间的延长，收缩率逐渐减小；当熔体在960℃保温30 min后，又在770℃保温60 min时，凝固收缩率达到最小值0．40％．单独加入Cu、Ni和Mn元素时，凝固收缩率分别从0．87％逐渐减小到0．77％、0．75％和0．52％．但是单独加入Mg元素时，凝固收缩率从0．87％逐渐增加到0．92％．
합금응고과정적수축회사주건산생축공、축송、열렬、응력화랭렬등결함．운용아기미덕원리설계료측정합금응고수축솔적실험장치，병연구료Al-25％ Si합금응고수축솔수용체온도처리화합금화원소적변화규률．시험결과발현：Al-25％ Si합금응고수축솔수과열온도적승고선감소후증대，수강온후보온시간적연장，수축솔축점감소；당용체재960℃보온30 min후，우재770℃보온60 min시，응고수축솔체도최소치0．40％．단독가입Cu、Ni화Mn원소시，응고수축솔분별종0．87％축점감소도0．77％、0．75％화0．52％．단시단독가입Mg원소시，응고수축솔종0．87％축점증가도0．92％．
Alloy solidification shrinkage can cause defects such as shrinkage hole ,shrinkage porosity , hot cracking and cold cracking .The experimental device for measuring the alloy solidification shrinkage using Archimedes'principle is designed and the effects of melt temperature treatment and alloying elements on the solidification shrinkage of Al-25% Si alloy are investigated .It is found that the solidification shrinkage of Al-25% Si alloy decreases first and then increases with increasing superheating-temperature ,and it decreases with increasing holding-time gradually .When the melt is hold at 960 ℃ for 30min and then at 770 ℃ for 60min ,the shrinkage reaches the minimum 0 .40% .With increasing the content of the copper ,nickel and manganese ,the solidification shrinkage decreases from 0 .87% to 0 .77% ,0 .75% and 0 .52% respectively ,but with increasing the content of the magnesium it increases from 0 .87% to 0 .92% .