单晶高温合金DD6不同状态下的元素分布与力学行为<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.012.020

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Abstract The element distribution between dendrite cores and interdendritic region of DD6 alloys at [001] orientation prepared by spiral grain selection method with different withdrawing rate (8 mm/min,3 mm/min) was analyzed by EPMA. The fracture characteristic and rupture life of single crystal superalloy DD6 were also investigated. The effect of creep rate (0.1%,0.2% and 0.5%) on segregation of main elements, elastic modulus and hardness of single crystal superalloy DD6 were investigated by EMPA and Hysitron Ti-950. The results showed that the alloy had coarse dendrite structure and high segregation coefficient of main elements under low withdrawing rate, and different withdrawing rate has little effect on rupture life. With the increase of creep rate, the difference of hardness and elastic modulus between dendrite cores and interdendritic increased, which was mainly caused by the element redistribution especially the redistribution of Ta, Hf, Mo and Nb.

Key words： Ni-based single crystal superalloy element distribution withdrawing rate creep rupture life spiral grain selection method

Published: 08 May 2018

CLC number:

TG132.3+2

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	Articles by authors
	JIANG Ruizhe
	GU Yuli
	HE Yuhuai

Cite this article:

JIANG Ruizhe,GU Yuli,HE Yuhuai. Elements Distribution and Mechanical Behavior of Single Crystal Superalloy DD6 Under Different Processing Conditions[J]. Materials Reports, 2017, 31(12): 93-97.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.012.020 OR http://www.mater-rep.com/EN/Y2017/V31/I12/93

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