Effect of heating rate on microstructure of semi-solid 2024 aluminum alloy during partial remelting

被引：0
|
作者：
Wang, Shuncheng [1 ]
Li, Yuanyuan [1 ]
Chen, Weiping [1 ]
Pan, Guoru [1 ]
Wang, Junwen [1 ]
机构：
[1] School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
来源：
Jinshu Xuebao/Acta Metallurgica Sinica | 2008年 / 44卷 / 08期
关键词：
Aluminum alloys - Heating - Billets (metal bars) - Heating rate - Remelting;
D O I：
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中图分类号：
学科分类号：
摘要：
The semi-solid 2024 alloy billets prepared by low superheat pouring method were reheated to 625C with heating rates of 0.12, 0.26 and 0.52C/s, respectively, and then held isothermally. The effect of heating rate on the microstructure of semi-solid billets was studied by optical microscope and metallographic image analysis system. The results show that the higher the heating rate is, the quicker the remelting is and the finer and rounder the grains are. Increasing the heating rate is helpful to suppress the eutectic dissolution and rise the melting superheat temperature, which can accelerate the formation of liquid phase between grains, restrain the coalescence and growth of grains to a certain extent and accelerate the spheroidization.
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页码：905 / 910
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