(中國科學(xué)院 金屬研究所， 沈陽 110016)
摘 要: 以中英合作研制大型鑄鋼支承輥為例， 首先闡述了鑄造工藝過程的計算機模擬過程， 包括充型過程的速度場、 凝固過程的溫度場以及微觀組織等軸晶與柱狀晶的轉(zhuǎn)變和它們之間的競相生長。其次， 對帶鋼熱軋過程中的組織演化和性能進行了模擬和預(yù)報； 同時采用具有自主知識產(chǎn)權(quán)的深過冷熱機械處理獲得梯度細(xì)晶顯微組織， 認(rèn)為通過軋制形變前的深過冷進一步降低形變溫度是獲得超細(xì)晶粒的關(guān)鍵。最后， 提出多尺度模擬與集成是今后材料制備計算機模擬的發(fā)展方向。
關(guān)鍵字: 材料制備； 計算機模擬； 超細(xì)晶粒鋼；深過冷
ZHANG Yu-tuo, LAN Yong-jun
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The casting process of a large-size back-up steel roll was simulated by computer, including the filling velocity field, solidification temperature field, the transformation and the competition growth of equiaxed crystals and column crystals. Then the microstructural evolution and the properties of a strip steel were simulated and predicted. It is found that by a thermo-mechanical treatment under severe undercooling, an ultra-fine and gradient grain structure can be obtained. Finally, it is pointed out that multi-scale and integration simulation will be the developing trend for simulation on materials processing.
Key words: materials processing; computer simulation; ultra-fine steel; severe undercooling
