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超輕鎂合金板坯直冷連鑄三維溫度場(chǎng)數(shù)值模擬
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A 3-D Mathematical Model of Thermal Field Evolution in the Direct Chill Casting of Superlight Magnesium Alloy Slabs
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Supported by the Key Grant of Science & Technology by the Ministry of Education of China (107031)

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    摘要:

    運(yùn)用有限差分法，對(duì)超輕Mg-Li合金（LA141）板坯直冷連鑄過程溫度場(chǎng)進(jìn)行數(shù)值模擬，根據(jù)實(shí)際過程的物理現(xiàn)象以及文獻(xiàn)資料確定包括一冷區(qū)、二冷區(qū)在內(nèi)的邊界條件，并且考慮底模與鑄坯之間隨著鑄坯的變形而引起的換熱系數(shù)的變化。通過計(jì)算鑄坯內(nèi)溫度場(chǎng)的分布，固-液界面的形狀和位置，分析各種鑄造參數(shù)，包括澆注溫度、冷卻水量、鑄造速度等對(duì)連鑄過程的影響。另外也比較了在同等鑄造條件下LA141鑄坯和AZ31鑄坯鑄造過程中凝固前沿的形狀

    Abstract:

    A mathematical model of the direct chill (DC) casting process for superlight Mg-Li alloy (LA141) slab has been developed using the finite differential method (FDM). Thermal boundary conditions including primary and secondary cooling conditions, have been selected based on knowledges of the physical process and the literatures. The variations of heat transfer coefficient between slab and dummy block interface resulting from the deformation of the slab have been considered. By calculating the temperature distribution, solid-liquid interface shape and position, the influence of casting parameters on DC casting process, such as the pour temperature, cooling water flow rate and casting speed have been analyzed. Moreover the profiles of the solidification fronts during the casting processes for the alloys of LA141 and AZ31 are compared.

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史淑艷,郝 海,張興國(guó),房燦峰,姚 山,金俊澤.超輕鎂合金板坯直冷連鑄三維溫度場(chǎng)數(shù)值模擬[J].稀有金屬材料與工程,2009,38(2):203~208.[Shi Shuyan, Hao Hai, Zhang Xingguo, Fang Canfeng, Yao Shan, Jin Junze. A 3-D Mathematical Model of Thermal Field Evolution in the Direct Chill Casting of Superlight Magnesium Alloy Slabs[J]. Rare Metal Materials and Engineering,2009,38(2):203~208.]
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  • 收稿日期:2008-01-27
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