Microstructural Evolution of a Third-Generation Single Crystal Superalloy DD33 During Solution Treatment

doi:10.11901/1005.3093.2013.848

Chinese Journal of Materials Research

2014, Vol. 28

Issue (6): 407-412 DOI: 10.11901/1005.3093.2013.848

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Microstructural Evolution of a Third-Generation Single Crystal Superalloy DD33 During Solution Treatment

Xingang LIU^1,^**(

),Qiang LEI²,Li WANG¹,Xiangwei LI¹,Bao QIAN³,Langhong LOU¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Guizhou Liyang Aviation Power Co., Ltd., Guizhou 561102
3. Jinzhou Hangxing Vacuum Equipment Co., Ltd., Jinzhou 121001

Cite this article:

Xingang LIU,Qiang LEI,Li WANG,Xiangwei LI,Bao QIAN,Langhong LOU. Microstructural Evolution of a Third-Generation Single Crystal Superalloy DD33 During Solution Treatment. Chinese Journal of Materials Research, 2014, 28(6): 407-412.

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Abstract

The microstructural evolution of a third-generation single crystal superalloy DD33 during solution treatment has been investigated by optical microscope (OM), Scanning electron microscope (SEM) and electron probe microanalysis (EPMA). The results show that the γ' particles in interdendritic regions of the alloy grew up obviously during isothermal exposure at 1310℃, and fully dissolved after heat treated at 1310℃/2 h. No significant dissolution of (g +γ') eutectic could be observed when solution treated at temperatures below 1320℃. The cursive -script like MC carbides dissolved gradually and then transform into granular MC particles during solution treatment, which promoted the coarsening of γ' precipitates in the interdendritic regions. The segregation of elements Al, Ta, Cr and Co in the eutectic γ' was enhanced with the increasing temperature, which may be induced by up-hill diffusion.

Key words: metallic materials single crystal superalloy solution treatment microstructure eutectic

Received: 12 November 2013

Fund: *Supported by National Basic Research Program (973 Program) of China No. 2010CB631201, National High Technology Research and Development Program (863 Program) of China Nos. 2012AA03A511 & 2012AA03A513, and National Natural Science Foundation of China No. 51201164.

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	Xingang LIU
	Qiang LEI
	Li WANG
	Xiangwei LI
	Bao QIAN
	Langhong LOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.848 OR https://www.cjmr.org/EN/Y2014/V28/I6/407

Fig.1 Solution treatment procedure of the experimental alloy

Fig.2 As-cast microstructure of the experimental alloy: (a) dendrite microstructure, (b) γ+γ' eutectic, (c) γ' phase in the dendrite core, (d) γ' phase in the interdendritic region, (e) MC carbides, (f) EDS spectrum of MC carbides

Fig.3 Microstructures of the experimental alloy at various stages of solution treatment: (a) and (c) 1240℃/2 h, (b) and (d) 1260℃/2 h

Fig.4 Microstructures of the experimental alloy at various stages of solution treatment: (a) 1280℃/2 h, (b) 1300℃/2 h, (c) 1310℃/2 h, (d) 1320℃/2 h, (e) 1330℃/2 h, (f) 1340℃/2 h

Fig.5 Morphology of MC carbides at various stages of solution treatment: (a) As-cast, (b) 1260℃/2 h, (c) 1280℃/2 h, (d) 1310℃/2 h

Fig.6 Volume fraction of MC carbides at different temperatures during solution treatment

Fig.7 Concentration curves of alloying elements in eutectic γ' at different temperatures during solution treatment

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