Formation of hot tearing in directional solidification

被引：0
作者：
Ding, H [1 ]
Fu, HZ
Liu, ZY
Dong, XB
机构：
[1] Xian Jiao Tong Univ, Dept Engn Mech, Xian 710049, Peoples R China
[2] Northwestern Polytech Univ, Dept Mat Sci & Technol, Xian 710072, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 1997年 / 26卷 / 01期
关键词：
hot tearing; solidification analysis; SEMA; dendritic bridging;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on solidification analysis in which mechanical properties of quasi-solid alloy and compensation of liquid alloy in dendritic boundries are considered, solidification process of alloy is divided to four stages, which are quasi-liquid stage, compensated stage, uncompensated stage and dendritic bridging stage. Hot tearing happened in uncompensated stage. In order to investigate hot tearing process, SEMA was carried out for hot cracks in directionally solidified Al-Cu and Rene125 alloys. Dendritic bridges were discovered in those cracks. And tracks caused by dendritic bridges broken were also discovered in crack sections. Therefore, hot tearing is proved to be caused by dendritic bridge breaking and developed through cavities between bridges joining together.
引用
收藏
页码：19 / 21
页数：3
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