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抽拉速率对螺旋选晶器选晶行为和晶体取向演变的影响
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1.西安科技大学 机械工程学院,陕西 西安 710054;2.西安航发精密铸造有限公司,陕西 西安 710021

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Effect of Withdrawal Rate of Spiral Selector on Grain Selec-tion Behavior and Grain Orientation Evolution
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Affiliation:

1.College of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China;2.Xi'an Hangfa Precision Casting Co., Ltd, Xi'an 710021, China

Fund Project:

National Natural Science Foundation of China (51875452)

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    摘要:

    采用宏观-微观耦合的元胞自动机(CAFE)方法,研究了不同抽拉速率对螺旋选晶器的选晶行为和晶体取向演变的影响,并通过实验对仿真结果进行了验证。结果表明:在相同的抽拉速率下,随着与激冷面距离的增大,枝晶数目逐渐减少,一次枝晶臂间距逐渐增大。随着抽拉速度由2 mm/min增加到8 mm/min,一次枝晶臂间距逐渐减小,枝晶茎数增加,枝晶间距逐渐减小,枝晶组织逐渐细化。在模拟过程中,在螺旋选择器启动块的3种抽拉速率下,固态组织的数量、面积和颜色都是相似的;在螺旋部分,在5 mm/min提取速率下晶体的微结构数量比其他2个提取速率下的少,并且面积更大,颜色更浅。从选晶器的晶粒组织演变和金相组织分析结果可以得出,中等抽拉速率(5 mm/min)下选晶器的选晶效率优于其他2种抽拉速率。

    Abstract:

    The grain selection process during single-crystal casting of a Ni-base superalloy DD5 in a spiral grain selector was simulated by a macroscale ProCAST coupled with a mesoscale cellular automaton finite element (CAFE) model, and the simulation results were validated by experimental observations. The results show that at the same withdrawal rate, the number of dendrites decreases gradually, and the primary dendrite arm spacing increases gradually with the increase of the distance from the chill surface. With increasing the withdrawal rate from 2 mm/min to 8 mm/min, the primary dendrite arm spacing decreases, the number of dendrite stems increases, the dendrite spacing decreases and the dendrite structure is refined gradually. During the simulation process, the quantity, area, and color of the solid tissue are similar at the three withdrawal rates of the spiral selector starter block. In the spiral part, the microstructures at 5 mm/min are less than those at the other two withdrawal rates, with larger area and lighter color. The grain selection efficiency at the intermediate withdrawal rate is better than that at the other two withdrawal rates, which is obtained from the results of the grain microstructure evolution and metallographic microstructure analysis of crystal selector.

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宗学文,王磊,刘文杰,张斌,张凌峰.抽拉速率对螺旋选晶器选晶行为和晶体取向演变的影响[J].稀有金属材料与工程,2021,50(7):2366~2374.[Zong Xuewen, Wang Lei, Liu Wenjie, Zhang Bin, Zhang Lingfeng. Effect of Withdrawal Rate of Spiral Selector on Grain Selec-tion Behavior and Grain Orientation Evolution[J]. Rare Metal Materials and Engineering,2021,50(7):2366~2374.]
DOI:10.12442/j. issn.1002-185X.20200413

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历史
  • 收稿日期:2020-06-12
  • 最后修改日期:2020-10-10
  • 录用日期:2020-10-15
  • 在线发布日期: 2021-08-09
  • 出版日期: 2021-07-31