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Features and effect factors of creep of single-crystal nickel-base superalloys
Tian, SG; Zhang, JH; Wu, X; Yang, HC; Xu, YB; Hu, ZQ
Corresponding AuthorTian, SG()
2001-12-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN1073-5623
Volume32Issue:12Pages:2947-2957
AbstractThe creep behavior of two single-crystal nickel-base superalloys with [001] orientation has been studied by measuring the creep curves, internal friction stress of dislocation motion, transmission electron microscopy (TEM) observation and energy-dispersive X-ray analysis (EDAX) composition analysis. The results show that over the stress and temperature range, there are different creep activation energies, time exponents, and effective stress exponents in two alloys at different creep stages. The size and volume fraction of the gamma' phase in the tantalum-free alloy is obviously decreased with the elevated temperature, This results in the decrease of the internal friction stress during steady-state creep. Higher levels of tungsten in the alloy result in a smaller strain value and lower directional-coarsening rate during primary creep. During steady-state creep, the primary reason for the better creep resistance of the other alloy is that it contains more Al and also Ta, which maintains a high volume fraction of gamma' phase. The dislocation climb over the gamma' rafts is the major deformation mechanisms during steady-state tensile creep. The fact that the strain rate is decreased with the increase of the size and volume fraction of the gamma' rafts may be described by a modified constitutive equation that is based on a model of the rate of dislocation motion.
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000172956700003
PublisherMINERALS METALS MATERIALS SOC
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/112020
Collection中国科学院金属研究所
Corresponding AuthorTian, SG
Affiliation1.Shenyang Polytechn Univ, Dept Mat Sci & Engn, Shenyang 110023, Peoples R China
2.Chinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture mat, Shenyang 110015, Peoples R China
3.Northeastern Univ, Coll Mat & Met, Shenyang 110006, Peoples R China
4.Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA
Recommended Citation
GB/T 7714
Tian, SG,Zhang, JH,Wu, X,et al. Features and effect factors of creep of single-crystal nickel-base superalloys[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2001,32(12):2947-2957.
APA Tian, SG,Zhang, JH,Wu, X,Yang, HC,Xu, YB,&Hu, ZQ.(2001).Features and effect factors of creep of single-crystal nickel-base superalloys.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,32(12),2947-2957.
MLA Tian, SG,et al."Features and effect factors of creep of single-crystal nickel-base superalloys".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 32.12(2001):2947-2957.
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