Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (10): 889-894.

• High Temperature Structural Materials • Previous Articles Next Articles

Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy

Jian Zhang, Jinguo Li, Tao Jin, Xiaofeng Sun, Zhuangqi Hu

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2) Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2009-12-24 Revised:2010-05-07 Online:2010-10-31 Published:2010-10-29
Contact: Jian Zhang
Supported by:
the National Basic Research Program (973 Program) of China under Grant No. 2010CB631200,
the National Natural Science Foundation of China (NSFC) under Grant No. 50931004 and 50971124

Abstract

Abstract: A single crystal Ni-base superalloy was processed with withdrawal rates between 2 and 7 mm/min. The as-cast microstructures, heat treatment response and creep property have been characterized as a function of the withdrawal rate. As expected, the primary and secondary dendrite arm spacing decreased with increasing withdrawal rate; microsegregation degree and porosity distribution were also varied with different withdrawalrates. The withdrawal rate of 2 mm/min resulted in a noticeable residual microsegregation even after full heat treatment. The samples solidified at 7 mm/min exhibited a high density of cast porosities, and this led to a dramatical decline of the creep strain. 4 or 6 mm/min appeared to be the optimum withdrawal rate in the present study, which resulted in a uniform microstructure and an optimum density of cast porosity.

Key words: Single crystal superalloy, Withdrawal rate, Microstructure, Creep

Jian Zhang Jinguo Li Tao Jin Xiaofeng Sun Zhuangqi Hu. Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy[J]. J Mater Sci Technol, 2010, 26(10): 889-894.

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Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy

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