Effect of Section Size and Solution Treatment on Micropore of a Third-Generation Single Crystal Superalloy DD33

doi:10.11901/1005.3093.2017.152

Chinese Journal of Materials Research

2018, Vol. 32

Issue (3): 168-176 DOI: 10.11901/1005.3093.2017.152

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Effect of Section Size and Solution Treatment on Micropore of a Third-Generation Single Crystal Superalloy DD33

Dongyu HAN^1,², Weiguo JIANG¹(

), Jiuhan XIAO¹, Xiangwei LI^1,², Langhong LOU¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;

Cite this article:

Dongyu HAN, Weiguo JIANG, Jiuhan XIAO, Xiangwei LI, Langhong LOU. Effect of Section Size and Solution Treatment on Micropore of a Third-Generation Single Crystal Superalloy DD33. Chinese Journal of Materials Research, 2018, 32(3): 168-176.

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Abstract

The effect of section size and solution treatment process on micropore of a nickel-based single crystal superalloy DD33 was investigated by optical microscope (OM) and scanning electron microscope (SEM). The results show that the primary dendrite arm spacing and the volume fraction of eutectics increase with the increasing of section size in the as-cast alloys. Solidification micropores occur at locations near the eutectic. The volume fraction of solidification micropores increases slightly with the increasing of section size. After the same solution treatment for alloys, the volume fractions of residual eutectics and micropores increase with the increasing of section size. Under the condition of the same section size, the volume fraction of micropores increases with the increasing of solution temperature. The formation of internal micropores is due to the Kirkendall effect induced by imbalanced diffusion of the elements during solution treatment. The different section sizes of castings lead to the different segregation degrees, which results in the different volume fractions of the homogenization micropores. According to the evolution of microstructure of the blade, the appropriate solution treatment process was designed and then verified experimentally.

Key words: metallic materials single crystal superalloy section size solution treatment micropore

Received: 24 February 2017

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (Nos. 51674235, 51671196, 51401216 & 51701220)

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	Dongyu HAN
	Weiguo JIANG
	Jiuhan XIAO
	Xiangwei LI
	Langhong LOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.152 OR https://www.cjmr.org/EN/Y2018/V32/I3/168

Fig.1 Microstructures of specimens with different section sizes and solution treatment processes:
(a) 0.5 mm/as-cast, (b) 0.5 mm/1300℃, (c) 0.5 mm/1320℃, (d) 0.5 mm/1330℃, (e) 2.5 mm/as-cast, (f) 2.5 mm/1300℃, (g) 2.5 mm/1320℃, (h) 2.5 mm/1330℃, (i) 5 mm/as-cast, (j) 5 mm/1300℃, (k) 5 mm/1320℃, (l) 5 mm/1330℃

Fig.2 Volume fraction of eutectics of specimens with different section sizes and solution treatment processes

Fig.3 Micropores of specimens with different section sizes and solution treatment processes:
(a) 0.5 mm/as-cast, (b) 0.5 mm/1300℃, (c) 0.5 mm/1320℃, (d) 0.5 mm/1330℃, (e) 2.5 mm/as-cast, (f) 2.5 mm/1300℃, (g) 2.5 mm/1320℃, (h) 2.5 mm/1330℃, (i) 5 mm/as-cast, (j) 5 mm/1300℃, (k) 5 mm/1320℃, (l) 5 mm/1330℃

Fig.4 Volume fraction of micropores of specimens with different section sizes and solution treatment processes

Fig.5 Micropore of as-cast alloy with the section size of 5 mm
(a) irregular solidification micropore near the eutectic, (b) irregular solidification micropore morphology, (c) subcircular solidification micropore near the eutectic, (d) subcircular solidification micropore morphology

Fig.6 Homogenization micropores of alloy with the section size of 2.5 mm and solution treatment at 1320℃
(a) homogenization micropore position, (b) homogenization micropore morphology

Fig.7 Morphologies of micropore near the eutectic of alloy with the section size of 2.5 mm and solution treatment at 1320℃ (a) solidification micropore, (b) homogenization micropore

Fig.8 Relationship between the volume fraction of eutectics and solution treatment temperatures

Fig.9 Relationship between the volume fraction of micropores and solution treatment temperatures

Fig.10 Microstructures and micropores of specimens with different section sizes and the solution treatment at 1335℃:
(a) and (d) 0.5 mm, (b) and (e) 2.5 mm, (c) and (f) 5 mm

Fig.11 Volume fraction of micropores of specimens with different section sizes and the solution treatment at 1335℃

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