Two-step reheating process of semi-solid billet and its resulting microstructure evolution
The effects of heating rate and isothermal temperature on the microstructure of semi-solid 2024 alloy billet were investigated. 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 isothermaUy held at solid-liquidus zone temperature.Microstructure evolution of the semi-solid billet during two-step reheating was investigated and compared with that during isothermal rehea ting. The results show that due to increasing the initial heating temperature,the remelting of the semi-solid billet during two-step rehea ting is faster than that during isothermal reheating. 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 of semi-solid billet during the two-step reheating process can restrain the coalescence and growth of grains to a certain extent and promote the spheroidization.
aluminum alloy semi-solid metal reheating microstructure
WANG Shuncheng ZHENG Feiyan NONG Deng QI Wenjun
Institute of Materials Processing,Guangzhou Research Institute of Non-Ferrous Metals,Guangzhou 510650,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
781-785
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）