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Microstructural stability and creep behavior of nickel base superalloy U720Li
Xiao, X; Zhou, LZ; Guo, JT
Corresponding AuthorZhou, LZ()
2001-11-18
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume37Issue:11Pages:1159-1164
AbstractMicrostructural stability creep behavior and deformation mechanisms have been investigated on nickel base superalloy U720Li at 650 and 700 degreesC. The results show that the primary and secondary gamma' particles as well as grain boundary phases maintain good thermal stability at 650-700 degreesC with aging time up to 3000 h, while the tertiary gamma' particles undergo a procedure of coarsening, dissolution and eventually complete disappearance with increasing of aging time and temperature. The primary creep strain at 650 degreesC increases monotonously with increasing of applied stress, while the primary creep strain at 700 degreesC decreases with increasing of applied stress below 550 MPa, and increases with increasing of applied stress above 550 MPa. Rupture lives and minimum creep rate at 650 and 700 degreesC fit double logarithmic relationship with different slopes at lower stress and high stress zones. Deformation mechanism under high temperature and low stress is attributed to dislocation climb over the secondary gamma' particles, while creep under the condition of low temperature and high stress is controlled by cutting of dislocations through the secondary gamma' particles.
Keywordnickel base superalloy thermal stability creep
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000172839900006
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/113383
Collection中国科学院金属研究所
Corresponding AuthorZhou, LZ
Affiliation1.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China
2.Liaoning Res Ctr Anal & Testing, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Xiao, X,Zhou, LZ,Guo, JT. Microstructural stability and creep behavior of nickel base superalloy U720Li[J]. ACTA METALLURGICA SINICA,2001,37(11):1159-1164.
APA Xiao, X,Zhou, LZ,&Guo, JT.(2001).Microstructural stability and creep behavior of nickel base superalloy U720Li.ACTA METALLURGICA SINICA,37(11),1159-1164.
MLA Xiao, X,et al."Microstructural stability and creep behavior of nickel base superalloy U720Li".ACTA METALLURGICA SINICA 37.11(2001):1159-1164.
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