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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 Jichun 1), LI Jiarong 1), SUN Fengli 2), LIU Shizhong 1), HAN Mei 1)
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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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     
Received:  05 September 2013     
ZTFLH:  TG132.3  
Corresponding Authors:  XIONG Jichun, senior engineer, Tel: (010) 62498312, Fax: (010) 62498306,
E-mail: jichunxiong@sina.com   

Cite this article: 

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

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