Microporosity Reduction By Liquid Cooling Process of A Single Crystal Nickel Based Superalloy

doi:10.11901/1005.3093.2014.172

Chinese Journal of Materials Research

2014, Vol. 28

Issue (9): 656-662 DOI: 10.11901/1005.3093.2014.172

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Microporosity Reduction By Liquid Cooling Process of A Single Crystal Nickel Based Superalloy

Xiangwei LI¹,Li WANG^1,^**(

),Xingang LIU¹,Sucheng WANG²,Langhong LOU¹

1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

Xiangwei LI,Li WANG,Xingang LIU,Sucheng WANG,Langhong LOU. Microporosity Reduction By Liquid Cooling Process of A Single Crystal Nickel Based Superalloy. Chinese Journal of Materials Research, 2014, 28(9): 656-662.

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Abstract

Microporosity in a single crystal nickel-based superalloy DD33 solidified by high rate solidification (HRS) and liquid metal cooling (LMC) process was investigated by the X-ray tomography (XRT). It is found that the pressure drop was reduced because of the larger volume fraction of eutectic in the alloy solidified by LMC, which results in less solidification-pore (S-pore) formation. Homogenization-pore (H-pore) forms in interdendritic regions during solution heat treatment, which results in the increase of volume fraction of porosities during heat treatment. However, lower level of H-pore in the LMC samples can be attributed to the finer dendrite arm spacing and the lower segregation.

Key words: metallic materials single crystal superalloy microporosity LMC XRT

Received: 08 April 2014

Fund: *Supported by National Basic Research Program of China No. 2010CB631201, National Natural Science Foundation of China No. 51201164 and National High Technology Research and Development Program of China No. 2012AA03A511.

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	Xiangwei LI
	Li WANG
	Xingang LIU
	Sucheng WANG
	Langhong LOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.172 OR https://www.cjmr.org/EN/Y2014/V28/I9/656

Table 1 The nominal compositions of the experimental alloy (%, mass fraction)

Fig.1 Schematic diagram shows the points measured in the dendrite core and interdendritic region

Fig.2 Typical 3-D microstructure of as-cast HRS sample obtained by XRT

Fig.3 As-cast microstructure of alloys solidified by HRS and LMC

Fig.4 Primary dendrite arm spacing and volume fraction of eutectics in alloys cast by HRS and LMC

Fig.5 Partition coefficient of alloying elements in alloys cast by HRS and LMC

Fig.6 Morphology of microporosity in the as-cast alloy by (a) SEM and (b) XRT

Fig.7 Distribution of pore diameter in alloys solidified by HRS and LMC

Fig.8 Morphology of microporosity in the solution heat treated alloy after 1330℃/10 h

Fig.9 Volume fraction of pores in alloys solidified by different process

Fig.10 Distribution of pore diameter in alloys solidified by different process

Fig.11 Schematic of Poisseuille

Fig.12 Generation of homogenization-pore

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