CHARACTERISTICS OF THE FRICTION WELDING INTERFACE BETWEEN SINGLE CRYSTAL SUPERALLOY DD3 AND FINE GRAINED SUPERALLOY GH4169

doi:10.11900/0412.1961.2014.00686

Acta Metall Sin

2015, Vol. 51

Issue (8): 951-956 DOI: 10.11900/0412.1961.2014.00686

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CHARACTERISTICS OF THE FRICTION WELDING INTERFACE BETWEEN SINGLE CRYSTAL SUPERALLOY DD3 AND FINE GRAINED SUPERALLOY GH4169

Suigeng DU(

),Xifeng WANG,Man GAO

Key Laboratory of Ministry of Education for Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072

Cite this article:

Suigeng DU,Xifeng WANG,Man GAO. CHARACTERISTICS OF THE FRICTION WELDING INTERFACE BETWEEN SINGLE CRYSTAL SUPERALLOY DD3 AND FINE GRAINED SUPERALLOY GH4169. Acta Metall Sin, 2015, 51(8): 951-956.

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Abstract

Due to high demand of welded turbine blisk, a fine grain superalloy, GH4169, has been widely used to make the disk and a single crystal superalloy, DD3, has been used for blades. In this work, the joint micro-structure and the mechanism of friction welding between the GH4169 and DD3 have been investigated by using the SEM and TEM equipped with EDS. The research results show that there is a friction deformed band of the GH4169 in the weld zone. The heat and mechanical affected zones of the two alloys form dynamic recrystallization grains. The bonding interface is between their dynamic recrystallization grains. The two alloys bond with the common grains and the common grain boundaries. Their compositional change mainly occurs within the common grains and the common grain boundaries at bonding interface. The common grain (C2) at the viewpoint of TEM analysis and adjacent dynamic recrystallization grain (C3) of the GH4169 has a specific orientation relationship, [1ˉ14]_C2 ∥ [1ˉ10]_C3 , (220)_C2 ∥ (220)_C3. With the friction welding thermal cycles and post weld heat treatment, the g' phase precipitates with tiny spherical distribution at the common grain and the two sides of dynamic recrystallization grains, and coherent with g matrix. But no g" phase precipitates.

Key words: single crystal superalloy friction welding bonding mechanism common grain

Fund: Supported by National Natural Science Foundation of China (No.51175430)

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	Suigeng DU
	Xifeng WANG
	Man GAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00686 OR https://www.ams.org.cn/EN/Y2015/V51/I8/951

Table 1 Chemical compositions of tested alloys

Fig.1 SEM images of the welding zone of DD3 and GH4169 friction welding joint (DRX—dynamic recrystallization)

Fig.2 SEM image (a) and EDS analysis (b) of common grain boundary in weld zone of DD3 and GH4169 friction welding

Fig.3 SEM image (a) and EDS analysis (b) of common grain in weld zone of DD3 and GH4169 friction welding

Fig.4 TEM image (a) and EDS analysis of areas C1~C4 in Fig.4a (b) in weld zone of DD3 and GH4169 friction welding

Fig.5 TEM image (a) and SAED analysis of grains C1 ([uvw]= ) (b), C2 ([uvw]= ) (c) and C3 ([uvw]= ) (d) in Fig.5a, composite SAED pattern of C2 and C3 (e) and center dark field image of g' phase (f)

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