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Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy
Alternative TitleMicrostructure heterogeneity and creep damage of DZ125 nickel-based superalloy
Sun Haofang1; Tian Sugui1; Tian Ning1; Yu Huichen2; Meng Xianlin1
2014
Source PublicationProgress in Natural Science: Materials International
ISSN1002-0071
Volume24Issue:3Pages:266-273
AbstractThe creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ′ precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ′ phase in the alloy transformed into the rafted structure along the direction vertical to the stress axis. The dislocations slipping and climbing over the rafted γ′ phase are attributed the deformation mechanism of the alloy during steady-state creep. The (1/2)?110? dislocations slipping in the γ matrix and ?110? super-dislocations shearing into the γ′ phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.
Other AbstractThe creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ' precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ' phase in the alloy transformed into the rafted structure along the direction vertical to the stress axis. The dislocations slipping and climbing over the rafted γ' phase are attributed the deformation mechanism of the alloy during steady-state creep. The (1/2) dislocations slipping in the γ matrix and〈1 1 0> super-dislocations shearing into the γ' phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.
KeywordDZ125 nickel-based superalloy Microstructure Creep mechanism Materials of engineering and construction. Mechanics of materials TA401-492
Indexed ByCSCD
Language英语
CSCD IDCSCD:5197925
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156974
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Beijing Institute Aeronaut Mat, Beijing 100095, Peoples R China
Recommended Citation
GB/T 7714
Sun Haofang,Tian Sugui,Tian Ning,et al. Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy[J]. Progress in Natural Science: Materials International,2014,24(3):266-273.
APA Sun Haofang,Tian Sugui,Tian Ning,Yu Huichen,&Meng Xianlin.(2014).Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy.Progress in Natural Science: Materials International,24(3),266-273.
MLA Sun Haofang,et al."Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy".Progress in Natural Science: Materials International 24.3(2014):266-273.
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