DD6高温合金定向凝固枝晶生长的数值模拟研究

金属学报, 2014, 50(3): 345-354. doi: 10.3724/SP.J.1037.2013.00496

DD6高温合金定向凝固枝晶生长的数值模拟研究

1.清华大学材料学院先进成形制造教育部重点实验室,北京,100084

2.清华大学材料学院先进成形制造教育部重点实验室,北京,100084

3.北京航空材料研究院先进高温结构材料重点实验室,北京,100095

4.清华大学材料学院先进成形制造教育部重点实验室,北京,100084

基金项目: National Science and Technology Major Project(.2011ZX04014-052 and 2012ZX04012-011) National Basic Research Program of China(2011CB706801) National Natural Science Foundation of China(51171089) 国家重点基础研究发展计划项目2011CB706801,国家自然科学基金项目51171089及国家科技重大专项项目2011ZX04014-052和2012ZX04012-011资助

关键词：元胞自动机 , DD6高温合金 , 定向凝固 , 枝晶生长 , 数值模拟

NUMERICAL SIMULATION OF DENDRITE GRAIN GROWTH OF DD6 SUPERALLOY DURING DIRECTIONAL SOLIDIFICATION PROCESS

Keywords： CA , DD6 superalloy , directional solidification , dendrite grain growth , numerical simulation

采用元胞自动机-有限差分(CA-FD)方法对DD6高温合金高速凝固法(HRS,high rapid solidification)定向凝固树枝晶三维生长过程进行模拟研究.建立温度场和溶质场耦合控制的枝晶生长模型,考虑抽拉速率和温度梯度等凝固条件的影响,同时考虑成分过冷、溶质分配系数、晶体择优取向等合金物性参数,模拟研究了枝晶形态的演化过程.模拟结果反映了高温合金树枝晶的竞争生长及形貌特征,描述了凝固过程的溶质分布变化及枝晶间距的动态调整过程.研究工作将模拟结果与实验结果进行了对比,两者吻合良好.模拟能够预测DD6高温合金HRS法定向凝固过程的枝晶形貌及一、二次枝晶间距动态调整过程.

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