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THE RECRYSTALLIZATION OF Ni BASE DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G
Peng Sheng; Zhou Lanzhang; Hou Jieshan; Guo Jianting
Corresponding AuthorZhou Lanzhang()
2010-08-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume46Issue:8Pages:907-912
AbstractDZ417G 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.
Keyworddirectionally solidified superalloy DZ417G recrystallization mechanical property
DOI10.3724/SP.J.1037.2010.00130
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000281719200002
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/102215
Collection中国科学院金属研究所
Corresponding AuthorZhou Lanzhang
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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