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Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B
Li, Qi1,2; Xie, Jun1; Yu, JinJiang1; Sheng, Naicheng1; Shu, Delong1; Hou, Guichen1; Li, JinGuo1; Sun, Xiaofeng1; Zhou, Yizhou1
Corresponding AuthorXie, Jun(junxie@imr.ac.cn) ; Yu, JinJiang(jjyu@imr.ac.cn)
2021-12-01
Source PublicationMATERIALS TODAY COMMUNICATIONS
Volume29Pages:13
AbstractThe high-W superalloy K416B is often used in aero-engine turbine blades. These have a varied casting thickness, and this may cause significant differences in the macrostructure, microstructure and mechanical properties of the blade. In this study, five castings of different thicknesses were produced by a specimen module which shared the same "cast-mold-environment" in order to simulate the varied thicknesses across a turbine blade. The macro and microstructure of specimens with different cast thicknesses were analyzed by optical microscope (OM), scanning electron microscope (SEM), electron backscatter diffraction (EBSD), electron probe microanalyzer (EPMA) and transmission electron microscopy (TEM). Microhardness and 975 degrees C/235 MPa rupture tests were performed to investigate the differences in mechanical properties. The results indicated that a larger cast thickness caused a lower solidification rate and increased element microsegregation. The relationship between the cast thickness H and secondary dendrite arm spacing lambda(2) was lambda(2) = 11.39H(0.55). The average area of eutectic gamma' and MC carbide phases was proportional to cast thickness. In addition, abnormal fine grains were observed at the bottom of the 40 mm specimen and the top of the 20 mm specimen. Large size alpha-W phases could be observed in these regions and are suggested to be the cause of the grain refinement. The hardness test results showed that the hardness of the specimen decreased as the cast thickness increased. The 975 degrees C/235 MPa rupture test results showed that the rupture property decreased in the 40 mm specimen, but that there was no significant alteration in the 3-20 mm specimens. These results provide a guidance for turbine blades manufacturing made from this high W cast polycrystalline superalloy.
KeywordCast thickness Abnormal fine grain Microstructure Microsegregation Mechanical properties
Funding OrganizationNational Natural Science Foundation of China ; Liaoning Provin-cial Natural Science Foundation of China ; Youth Innova-tion Promotion Association Project, Chinese Academy of Sciences ; Youth Innovation Promotion Association Project, Chinese Academy of Sciences (2020) ; National Science and Technology Major Project
DOI10.1016/j.mtcomm.2021.102916
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51771191] ; National Natural Science Foundation of China[51971214] ; Liaoning Provin-cial Natural Science Foundation of China[2019-MS-336] ; Youth Innova-tion Promotion Association Project, Chinese Academy of Sciences[KFJ-STS-QYZX-079] ; Youth Innovation Promotion Association Project, Chinese Academy of Sciences (2020) ; National Science and Technology Major Project[J2019-VI-0018-0133]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000718046500001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167469
Collection中国科学院金属研究所
Corresponding AuthorXie, Jun; Yu, JinJiang
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Li, Qi,Xie, Jun,Yu, JinJiang,et al. Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B[J]. MATERIALS TODAY COMMUNICATIONS,2021,29:13.
APA Li, Qi.,Xie, Jun.,Yu, JinJiang.,Sheng, Naicheng.,Shu, Delong.,...&Zhou, Yizhou.(2021).Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B.MATERIALS TODAY COMMUNICATIONS,29,13.
MLA Li, Qi,et al."Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B".MATERIALS TODAY COMMUNICATIONS 29(2021):13.
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