鋁合金熱連軋組織的模擬方法

Microstructure Simulation of Hot-Rolled Aluminium Strip in a Tandem Mill

陳溪鎔(S.R. Chen)

《鑛冶：中國鑛冶工程學會會刊》 64卷2期 (2020/06) Pp. 30-43

https://doi.org/10.30069/MM.202006_64(2).03

摘要

本文敘述平面應變壓縮模擬鋁合金熱軋組織的方法，文中將生產參數導入Gleeble 3800實驗設備，模擬觀測輥隙內部流變應力與料溫變化，再於完軋瞬間實施急速冷卻以保存高溫變形組織，搭配後續的盤捲冷卻曲線，複製產線的熱軋組織；若改搭配恒溫退火，可觀測該熱連軋條件的成核率、成長率、晶粒方位分佈與退火晶粒度；結合Arrhenius、Avrami理論式與數值分析方法，導出再結晶曲線與活化能，定量評估盤捲溫度與冷卻速率的影響；依序展開改變軋延參數：溫度、裁減率、應變速率、pass間隔與累積應變，以及起軋素材的晶粒度、合金成份與鋁胚均質化處理條件等觀測，釐清熱軋再結晶行為的生產要素。鋁合金的應用案例證實，熱軋組織模擬具有縮短生產時間又提昇熱軋品質的功能。

關鍵字

平面應變壓縮 ； Gleeble 3800熱模擬器 ； 再結晶行為 ； 再結晶活化能 ； 熱軋參數效應 ； 鋁

並列摘要

Hot plane strain compression tests linked with a Gleeble 3800 simulator were carried out to assess the recrystallization behaviors of hot-rolled aluminium strip. Flow stress and temperature variation during hot deformation were evaluated. Deformed microstructure could be obtained by a rapid cooling at the end of the compression and microstructure of the mill-rolled strip was successfully reproduced. Effects of coiling temperature and cooling rate were numerically analyzed using Arrhenius law and the observed activation energy for recrystallization. The deformed microstructure was also isothermally annealed and measurements of number density, size and volume fraction of the recrystallized grains were made. Recrystallization curves of annealing were derived on the basis of Avrami equation to understand the effects of rolling parameters, initial grain size, alloying compositions and homogenization conditions. When applied, hot-rolled aluminum strips with shorter processing times having fully recrystallized grains have been achieved.

並列關鍵字

plane strain compression ； Gleeble 3800 simulator ； recrystallization behaviors ； activation energy for recrystallization ； effects of rolling parameters ； aluminium