THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G

doi:10.3724/SP.J.1037.2010.00130

IMR OpenIR

	THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G
	Peng Sheng; Zhou Lanzhang; Hou Jieshan; Guo Jianting
通讯作者	Zhou Lanzhang()
	2010-08-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	46 期号:8 页码:907-912
摘要	DZ417G is a directionally solidified (DS) superalloy developed for low-pressure blade applications in gas turbine engines The crystallization microstructures of DZ417G samples caused by sand-blasting and machining were investigated. The tensile properties of the alloy after crystallization were tested at room temperature and 900 V and its stress-rupture performance was examined under conditions of 980 degrees C/216 MPa and 760 degrees C/725 MPa The results show that after solution treatment equiaxed recrystallization grains form on the surface of specimens machined from directionally solidified alloy bars After aging treatment, cellular recrystallization takes place on the surface of specimens pretreated by sand blasting Both the yield strength and tensile strength at room temperature decrease after recrystallization, while those at 900 V are slightly affected by recrystallization. The recrystallization depth increases after stress-rupture tests, which may be attributed to migration of recrystallization boundaries driven by high temperature and stress. For samples without recrystallization microstructure, the fracture mode is transgranular, which is controlled by the propagation rate of the cracks initiated both on sum face and at inner microstructure discontinuities While for samples with recrystallization microstructure: the cracks prefer to be initiated on transverse recrystallization grain boundaries and propagate along the recrystallization boundaries into the matrix, which may accelerate the propagation rate TRF (transverse recrystallization area fraction) is a factor to evaluate the effect of recrystallization on the stress-ruptured performance The stress-ruptured performance is decreased with the increase of TRF between 0 and 0.5. For samples with a TRF of 0 5, second cellular recrystallization forms in the first equiaxed recrystallization grain The cracks mitated at interfaces of cellular microstructure have a high density, which impair the stress-ruptured performance of DZ417G alloy.
关键词	directionally solidified superalloy DZ417G recrystallization mechanical property
DOI	10.3724/SP.J.1037.2010.00130
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000281719200002
出版者	SCIENCE CHINA PRESS
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/102215
专题	中国科学院金属研究所
通讯作者	Zhou Lanzhang
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Peng Sheng,Zhou Lanzhang,Hou Jieshan,et al. THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G[J]. ACTA METALLURGICA SINICA,2010,46(8):907-912.
APA	Peng Sheng,Zhou Lanzhang,Hou Jieshan,&Guo Jianting.(2010).THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G.ACTA METALLURGICA SINICA,46(8),907-912.
MLA	Peng Sheng,et al."THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G".ACTA METALLURGICA SINICA 46.8(2010):907-912.