A.Sugiyama2, T. Ohmichi2
(1. 上海交通大學 模具CAD國家工程研究中心, 上海 200030；
2. Osaka University, Yamada oka 2-1,Suita, Osaka, Japan)
摘 要: 采用半固態(tài)合金二次加熱，對半固態(tài)坯料施加合理的二次加熱路徑， 重新獲得適于后續(xù)加工的具有近球狀固相顆粒均勻分布的半固態(tài)組織。 采用功率為20kW， 頻率為30kHz的高頻感應加熱裝置， 研究了采用再熔融加熱法制備的ZL101半固態(tài)合金坯料的二次加熱過程。 結果表明：為了獲得適于最終成形的半固態(tài)組織， 有必要把半固態(tài)坯料二次加熱過程分為幾個加熱速率不同的加熱階段， 然后在半固態(tài)溫度區(qū)間某一需要加工溫度下進行適度保溫。 通過實驗給出了ZL101合金半固態(tài)坯料二次加熱條件， 并討論了二次加熱條件對半固態(tài)組織演化的影響。
關鍵字: 再熔融加熱法；半固態(tài)合金； 二次加熱； 組織演化
H. Yasuda2, A. Sugiyama2, T. Ohmichi2
（1. National Die and Mold CAD Engineering Research Center,
Shanghai Jiaotong University, Shanghai 200030, China;
2. Osaka University, Yamada oka 2-1, Suita, Osaka, Japan）
Abstract:By reheating the semi-solid microstructure with spheroidal solid particles distributed uniformly in the liquid phase can be obtained. The reheating conditions of the semi-solid billet of ZL101 alloy produced by re-melting heat treatment method were studied. The rational reheating route including optimal holding time was obtained through reheating experiments using a high frequency heater with power of 20kW and frequency of 30kHz. The results show that it is necessary to divide the whole reheating process into several heating stages with different heating rates in order to obtain satisfactory semi-solid structure before final forming. Finally, the structure evolution during reheating process was discussed.
Key words: re-melting heat treatment method; semi-solid alloys; reheating; structure evo
