MICROSTRUCTURE OF RECRYSTALLIZATION AND THEIR EFFECTS ON STRESS RUPTURE PROPERTY OF SINGLE CRYSTAL SUPERALLOY DD6

doi:10.3724/SP.J.1037.2013.00561

Acta Metall Sin

2014, Vol. 50

Issue (6): 737-743 DOI: 10.3724/SP.J.1037.2013.00561

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MICROSTRUCTURE OF RECRYSTALLIZATION AND THEIR EFFECTS ON STRESS RUPTURE PROPERTY OF SINGLE CRYSTAL SUPERALLOY DD6

XIONG Jichun¹, LI Jiarong¹, SUN Fengli², LIU Shizhong¹, HAN Mei¹

1 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095
2 The 3rd Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095

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XIONG Jichun, LI Jiarong, SUN Fengli, LIU Shizhong, HAN Mei. MICROSTRUCTURE OF RECRYSTALLIZATION AND THEIR EFFECTS ON STRESS RUPTURE PROPERTY OF SINGLE CRYSTAL SUPERALLOY DD6. Acta Metall Sin, 2014, 50(6): 737-743.

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Abstract

The specimens of single crystal superalloy DD6 were grit blasted and heat treated at 1100, 1200, and 1300 ℃ for 4 h at vacuum atmosphere respectively, then the microstructure of recrystallized DD6 alloy and their effects on the stress rupture performance were investigated. The results showed that cellular recrystallization nucleated in grit blasted samples heat treated at 1100 ℃ for 4 h, the dislocation tangles were found in the front of cellular recrystallization grain boundary in DD6 alloy, equiaxed recrystallization grains nucleated in grit blasted samples heat treated at 1300 ℃ for 4 h, and the carbides precipitate at the equiaxed recrystallization grain boundary, while the coexistence of equiaxed recrystallization grains and cellular recrystallization, defined as mixed recrystallization, occurred in the grit blasted samples heat treated at 1200 ℃ for 4 h. The cellular recrystallization reduced the stress rupture lives of DD6 alloy slightly, and the equiaxed recrystallization reduced stress rupture lives seriously, while the reduction degree of the stress rupture lives of the mixed recrystallization was between cellular recrystallization and equiaxed recrystallization. Besides this, with increase of depth of recrystallization and stress, the stresses rupture life decreased. It was also found that the fracture surface configuration was belonging to intergranular fracture with equiaxed recrystallization samples. The characteristic of the fracture surface changed to dimple fracture with cellular recrystallization samples, at all these condition the crack nucleated on the recrystallization grain boundaries of specimens during stress rupture process.

Key words: single crystal superalloy DD6 recrystallization microstructure stress rupture property

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	Jichun XIONG
	Jiarong LI
	Fengli SUN
	Shizhong LIU
	Mei HAN

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00561 OR https://www.ams.org.cn/EN/Y2014/V50/I6/737

Fig.1 SEM images of grit blasted DD6 alloy after different heat treatments

(a) 1100 ℃, 4 h, cellular recrystallization (CRX)

(b) 1100 ℃, 4 h, electrolytically etched, CRX

(d) 1300 ℃, 4 h, equiaxed recrystallization (ERX)

Fig.2 TEM and HRTEM images of CRX grain

(a) TEM image of CRX

(b) dislocation tangles in the front of CRX

(d) HRTEM image at CRX boundary (Insets show Fourier transformations)

Fig.3 SEM (a) and HRTEM (b) images of ERX grain (Insets show Fourier transformations)

Fig.4 Stress rupture lives of recrystallized DD6 alloy at 980 ℃, 250 MPa and 1070 ℃, 160 MPa

Fig.5 Elongations of recrystallized DD6 alloy at 980 ℃, 250 MPa and 1070 ℃, 160 MPa

Fig.6 Microstructures and fracture surfaces of failed specimens of DD6 alloy with recrystallization grains

(a) fracture surface of DD6 alloy with CRX

(b) fracture surface of DD6 alloy with ERX

(d) microstrure of DD6 alloy with MRX near fracture surface

(e) microstrure of DD6 alloy with ERX near fracture surface

(f) magnified microstrure of DD6 alloy with ERX near fracture surface

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