Microstructure evolution of semi-solid 2024 alloy during two-step reheating process

A two-step reheating process was proposed and applied to perform reheating experiments on the semi-solid 2024 alloy billet. In this process, the semi-solid billet was firstly heated over liquidus temperature and then isothermally held at solid-liquid zone temperature. Microstructure evolution of the...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2008-08, Vol.18 (4), p.784-788
Main Author: 王顺成 李元元 陈维平 郑小平
Format: Article
Language:English
Subjects:
2024 alloy
2024合金
microstructure evolution
reheating
semi-solid metal
thixoforming
两步加热过程
半固态金属
微观结构
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Summary:A two-step reheating process was proposed and applied to perform reheating experiments on the semi-solid 2024 alloy billet. In this process, the semi-solid billet was firstly heated over liquidus temperature and then isothermally held at solid-liquid zone temperature. Microstructure evolution of the semi-solid billet during two-step reheating was studied by optical microscope and compared with that during isothermal reheating. The results show that the remelting rate of the semi-solid billet during two-step reheating is faster than that during isothermal reheating. Under the same reheating time, the grains of the semi-solid billet reheated by two-step reheating process are finer and rounder than those by isothermal reheating process. The present experimental results indicate that accelerating the formation of liquid phase during the two-step reheating process can restrain the coalescence of grains to a certain extent, and thus refine the grain size and promote the grain spheroidization.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60135-1