Effects of Thermal Baffle Thickness on the Solidification Microstructure of Single Crystal Superalloy DD6

Yue Xiangang; Peng Zhijiang; Zou Jianbo; Shi Fengling; Zou Zhuo; Li Jinguo

doi:10.15980/j.tzzz.2014.03.026

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Effects of Thermal Baffle Thickness on the Solidification Microstructure of Single Crystal Superalloy DD6
Vol. 34, Issue 3, Pages: 309-313(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.03.026

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[1]乐献刚,彭志江,邹建波,史凤岭,邹卓,李金国.隔热挡板厚度对DD6单晶高温合金凝固组织的影响[J].特种铸造及有色合金,2014,34(03):309-313.

Yue Xiangang, Peng Zhijiang, Zou Jianbo, et al. Effects of Thermal Baffle Thickness on the Solidification Microstructure of Single Crystal Superalloy DD6. [J]. Special Casting & Nonferrous Alloys 34(3):309-313(2014)
[1]乐献刚,彭志江,邹建波,史凤岭,邹卓,李金国.隔热挡板厚度对DD6单晶高温合金凝固组织的影响[J].特种铸造及有色合金,2014,34(03):309-313. DOI： 10.15980/j.tzzz.2014.03.026.

Yue Xiangang, Peng Zhijiang, Zou Jianbo, et al. Effects of Thermal Baffle Thickness on the Solidification Microstructure of Single Crystal Superalloy DD6. [J]. Special Casting & Nonferrous Alloys 34(3):309-313(2014) DOI： 10.15980/j.tzzz.2014.03.026.

摘要

单晶凝固过程中隔热挡板的控制对温度梯度及温度场均匀性有重要影响

进而会影响到单晶凝固组织

因此需要对隔热挡板进行研究。采用第二代单晶高温合金DD6

研究了不同厚度隔热挡板对DD6单晶高温合金凝固组织的影响。结果表明

随着隔热挡板厚度增加

单晶凝固过程中温度梯度降低

但晶体生长方向与[001]偏离度变小。此外

随着隔热挡板厚度增加

DD6单晶高温合金一次枝晶间距增大

γ-γ′共晶含量和尺寸增加

枝晶干与枝晶间的铸态γ′尺寸略有增加

合金主要元素偏析加大。

Abstract

The control of thermal baffle has an important role in the temperature gradient and the homogeneous temperature field in the process of single crystal superalloy solidification as a result of affecting the solidification microstructures of the single crystal superalloy

so it is necessary to analyze the thermal baffle.Influences of different thermal baffle thickness on the solidification microstructures of the second generation single crystal superalloy DD6 were investigated.The results reveal that with increasing in the thickness of thermal baffle

the temperature gradient is decreased in the process of single crystal superalloy solidification

while the angle between the single crystal growth orientation and the[001] orientation is narrowed.In addition

as the thermal baffle thickness increases

the primary dendrite arm spacing is increased

and the size and the volume fraction ofγ-γ′eutectic are increased too.Meanwhile

the size ofγ′phase in the primary dendrite and in the interdendrite is increased slightly accompanying with the increase of segregation ratio of main elements.