FORMATION OF SOLIDIFICATION AND HOMOGENISATION MICROPORES IN TWO SINGLE CRYSTAL SUPERALLOYS PRODUCED BY HRS AND LMC PROCESSES

doi:10.3724/SP.J.1037.2012.00172

Acta Metall Sin

2012, Vol. 48

Issue (10): 1237-1247 DOI: 10.3724/SP.J.1037.2012.00172

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FORMATION OF SOLIDIFICATION AND HOMOGENISATION MICROPORES IN TWO SINGLE CRYSTAL SUPERALLOYS PRODUCED BY HRS AND LMC PROCESSES

SHI Qianying ^1,2, LI Xianghui ³, ZHENG Yunrong ², XIE Guang ⁴,ZHANG Jian ^4,5, FENG Qiang ^1,2

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083
3. Science and Technology on Advanced High Temperature Structural Material, Beijing Institute of Aeronautical Materials, Beijing 100095
4. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
5. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

. FORMATION OF SOLIDIFICATION AND HOMOGENISATION MICROPORES IN TWO SINGLE CRYSTAL SUPERALLOYS PRODUCED BY HRS AND LMC PROCESSES. Acta Metall Sin, 2012, 48(10): 1237-1247.

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Abstract

Effects of processing techniques and alloying chemistry on the formation of solidification and homogenization micropores were investigated in this study for two single crystal nickel–based superalloys with different compositions produced by Bridgman (HRS) and LMC processes. The results show that the volume fraction of micropores in as–cast HRS alloy is lower than that in as–cast LMC alloy, and they are mainly influenced by alloy chemistry. After solution heat treatment, external and internal homogenization micropores are observed to form at the Al–depletion zone near the surface region and the internal zone away from the surface, respectively. The number of external homogenization micropores reduces with increasing the distance away from the surface. Responding to high temperature oxidizing environment (in air), the formation of such homogenization micropores is ascribed to fast outward diffusion of Al, which lead to the formation of Kirkendall voids within the Al–depletion zone. Additionally, the formation of internal homogenization micropores at high temperature is due to Kirkendall effect during the diffusion process of alloying elements between dendrite and interdendrite regions. Smaller primary dendrite arm spacing and lower level of solidification segregation in the LMC alloy results in much less internal homogenization micropores in comparison with the HRS alloy.

Key words: single crystal superalloy micropore solution treatment directional solidification liquid metal cooling

Received: 05 April 2012

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Supported by National Basic Research Program of China (No.2010CB631201)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00172 OR https://www.ams.org.cn/EN/Y2012/V48/I10/1237

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