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EFFECT OF LATERAL PRE-COMPRESSION ON CREEP BEHAVIOR OF A 011 ORIENTED SINGLE CRYSTAL NICKEL-BASED SUPERALLOY
Alternative TitleEFFECT OF LATERAL PRE-COMPRESSION ON CREEP BEHAVIOR OFA 011 ORIENTED SINGLE CRYSTAL NICKEL-BASED SUPERALLOY
Su Yong1; Tian Sugui1; Yu Huichen3; Yu Lili1
2015
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:5Pages:612-622
AbstractSingle crystal nickel-based superalloys mainly consisting of gamma and gamma'phases are widely used in turbine blades for their excellent mechanical performances, in particular creep resistance at high temperatures. The creep properties of single crystal superalloys are inherently anisotropic. Although commercial single crystal superalloys are all along orientation, it is difficult to ensure the exact orientation during production, and in service the applied centrifugal force on blades unavoidably deviates from orientation, so the study on non- oriented single crystal superalloys is significant on improving the creep theory of superalloys. Compared with the oriented single crystal superalloys, the oriented ones generally display poor creep resistance. Through pre-rafting treatment of gamma'phase in oriented single crystal superalloys, the creep resistance of the alloys are expected to be enhanced by changing the deformation mechanism, especially by hindering dislocation movements, but the effect of the treatment on oriented alloys is still not clear. For this reason, by means of pre-compression, creep tests and microstructure observation, the effect of the pre-rafting of gamma'phase on creep behavior of a 011 oriented single crystal nickel-based superalloy at 1040 degrees C, 137 MPa is studied. Results show that after pre-compression at 1040 degrees C, 180 MPa along 100 orientation for 38 h, the gamma'phase in the 011 oriented alloy has transformed into P-type rafted structure parallel to the compressive stress axis. Different strain energy density distribution and lattice strain on crystal planes during pre-compression are the main reasons for the rafting behavior of gamma'phase. Dislocations slipping in gamma matrix channels is the main deformation mechanism of the 011 oriented alloy with and without pre-compression. Thereinto, many dislocations-climbing movements occur in the pre-compressed one. The lateral pre-compression remarkably improves the creep strength of the alloy at 1040 degrees C, 137 MPa. The elimination of gable channels, relatively narrow roof channels during steady-state creep stage, the formation of micro-bottleneck-like channels and labyrinth-like microstructures due to the lateral growth of gamma' rafts, and the more effectively activated slip systems of dislocations are beneficial to impeding dislocation movements and responsible for the better creep resistance of the pre-compressed alloy.
KeywordSTRESS RUPTURE PROPERTIES PRECIPITATE MORPHOLOGY DEFORMATION MECHANISM TEMPERATURE CREEP FATIGUE BEHAVIOR TENSILE CREEP MICROSTRUCTURE ORIENTATIONS EVOLUTION CMSX-4 011 oriented single crystal superalloy pre-compression creep microstructure rafting slip system
Indexed ByCSCD
Language英语
CSCD IDCSCD:5428453
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145134
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.沈阳大学
3.AVIC Beijing Institute Aeronaut Mat, Beijing Key Lab Aeronaut Mat Testing & Evaluat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China
Recommended Citation
GB/T 7714
Su Yong,Tian Sugui,Yu Huichen,et al. EFFECT OF LATERAL PRE-COMPRESSION ON CREEP BEHAVIOR OF A 011 ORIENTED SINGLE CRYSTAL NICKEL-BASED SUPERALLOY[J]. ACTA METALLURGICA SINICA,2015,51(5):612-622.
APA Su Yong,Tian Sugui,Yu Huichen,&Yu Lili.(2015).EFFECT OF LATERAL PRE-COMPRESSION ON CREEP BEHAVIOR OF A 011 ORIENTED SINGLE CRYSTAL NICKEL-BASED SUPERALLOY.ACTA METALLURGICA SINICA,51(5),612-622.
MLA Su Yong,et al."EFFECT OF LATERAL PRE-COMPRESSION ON CREEP BEHAVIOR OF A 011 ORIENTED SINGLE CRYSTAL NICKEL-BASED SUPERALLOY".ACTA METALLURGICA SINICA 51.5(2015):612-622.
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