摘要
通过使用砂型模、Y形钢模和楔形铜模三种浇注模具,研究凝固速率对铝硅合金的凝固组织及力学性能的影响规律。结果表明,随着凝固速率增加,合金二次枝晶臂间距、共晶硅尺寸和缺陷尺寸均降低,晶粒形貌逐渐转变为树枝晶或细小蔷薇晶粒。在Y形钢模中合金的凝固速率为2~5℃/s,相应的凝固组织较为细密且缺陷较少,同时有利于形成少量Al3M初生相。通过建立合金二次枝晶臂间距分别与凝固冷却速率和屈服强度之间的变化关系式,阐述了凝固速率对合金组织及力学性能的影响规律。
The effects of solidification rates on microstructure and mechanical properties of Al-Si alloys were studied by using sand mold,Y-shaped steel mold and wedge-shaped copper mold.The results show that with the increase of solidification rate,secondary dendrite arm spacing(SDAS),eutectic silicon size and defect size all decrease,and the grain morphology gradually changes to dendritic or fine rose grain.The solidification rate of the alloy in the Y-shaped steel mold is 2-5℃/s,and the corresponding solidification microstructure shows fine size with few defects,which is conductive to the formation of a small amount of Al3M primary precipitated phase.The effects of solidification rates on microstructure and mechanical properties of alloy were explained by establishing the relationship between SDAS and solidification rate/yield strength.
作者
蒲博闻
王根全
周海涛
毛郭灵
王韬
许虹雯
PU Bo-wen;WANG Gen-quan;ZHOU Hai-tao;MAO Guo-ling;WANG Tao;XU Hong-wen(China North Engine Research Institute(Tianjin),Tianjin 300400,China)
出处
《铸造》
CAS
2024年第1期76-80,共5页
Foundry
关键词
铝硅合金
凝固速率
组织
力学性能
Al-Si alloy
solidification rates
microstructure
mechanical properties
