铸造2025，Vol.74Issue(10)：1344-1351,8.
冷铁组织演变对ZL205A合金铸件线性偏析的影响
Effect of Microstructure Evolution of Chill on Linear Segregation of ZL205A Alloys
刘建辉 1杨琴 1闻福林 1郑登智1
作者信息
- 1. 中国工程物理研究院机械制造工艺研究所,四川绵阳 621900
- 折叠
摘要
Abstract
ZL205A alloys exhibit low density,good plasticity,and high static load capacity.In engineering applications,chills are commonly employed to suppress defects such as shrinkage porosity and cracks in castings.However,few studies report the microstructure evolution of the chills during repeated casting processes and their impact on casting quality.Experimental investigations were conducted using optical microscopy,scanning electron microscopy,hardness testing and laser thermal conductivity analysis.By comparing the microstructure and properties of C45 steel chill with different service times,it is found that the microstructure of C45 steel was mainly composed of ferrite and pearlite after heating followed by slow cooling.The ferrite content and grain size increased significantly after multiple thermal cycles,resulting in a significant decrease in the dislocation density and an increase in the thermal diffusion coefficient of the chill.The increase of thermal diffusion coefficient led to the enhancement of the chilling effect of the chill,which intensified the shrinkage tendency and thus the occurrence of the hot cracking during the solidification of the ZL205A alloys.As a result,the molten metal filled the hot cracking area to produce a Cu-rich region,and linear segregation occurred in the ZL205A alloys.关键词
ZL205A合金/冷铁/热扩散系数/线性偏析Key words
ZL205A alloys/chill/thermal diffusion coefficient/linear segregation分类
金属材料引用本文复制引用
刘建辉,杨琴,闻福林,郑登智..冷铁组织演变对ZL205A合金铸件线性偏析的影响[J].铸造,2025,74(10):1344-1351,8.
