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Acta Metall Sin  2009, Vol. 45 Issue (10): 1232-1236    DOI:
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CHARACTERISTIC AND FORMATION MECHANISM OF PRECIPITATES AT RECRYSTALLIZATION GRAIN BOUNDARIES OF SINGLE CRYSTAL
SUPERALLOY DD6
XIONG Jichun1; LI Jiarong1; ZHAO Jinqian1; LIU Shizhong1; DONG Jianxin2
1. National Key Laboratory of Advanced High Temperature Structural Materials; Beijing Institute of Aeronautical Materials; Beijing 100095
2. High Temperature Materials Research Laboratory; University of Science & Technology Beijing; Beijing 100083
Cite this article: 

XIONG Jichun LI Jiarong ZHAO Jinqian LIU Shizhong DONG Jianxin. CHARACTERISTIC AND FORMATION MECHANISM OF PRECIPITATES AT RECRYSTALLIZATION GRAIN BOUNDARIES OF SINGLE CRYSTAL
SUPERALLOY DD6. Acta Metall Sin, 2009, 45(10): 1232-1236.

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Abstract  

Single crystal superalloys have extremely good elevated temperature capability in advanced gas turbine aero engines due to no highly stressed grain boundaries in them. With the removal of grain boundary strengthening elements such as C, B and Zr, the occurrence of recrystallization may be detrimental to their performance. Therefore, recrystallization becomes critical in industrial manufacture of single crystal superalloy blades. In the present study, specimens of single crystal superalloy DD6 were grit blasted, solution treated and aged at vacuum atmosphere, and then the
precipiaes at recrystallization grain boundaries were invstigated by SE, TE, EPMA and Themo–Calc. The results show that a few of M6C carbides preciptate at recrystallization grain boundaries, and their size is about 0.5 μm. These M6C carbides are rch in W, Re and Mo, but poor in A, Ta, Ni,
the contents of Cr, Nb, Co in them are almost the same as the nominal composition of DD6 alloy. The carbon accumulation arecrystallization boundaries and combination with μ phase forming elements such as W and Mo restrain the μ phase forming. M23C6 phase hardly forms in DD6 alloy due to its high W and low Cr content.

Key words:  single crystal superalloy      DD6      recrystallization      precipitate     
Received:  02 April 2009     
ZTFLH: 

TG132.3+2

 

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I10/1232

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