Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B

doi:10.1016/j.mtcomm.2021.102916

CORC > 金属研究所 > 中国科学院金属研究所

	Effect of casting thickness on microstructure and mechanical properties of the high-W superalloy K416B
	Li, Qi 1,2; Xie, Jun 2; Yu, JinJiang 2; Sheng, Naicheng 2; Shu, Delong 2; Hou, Guichen 2; Li, JinGuo 2; Sun, Xiaofeng 2; Zhou, Yizhou 2
刊名	MATERIALS TODAY COMMUNICATIONS
	2021-12-01
卷号	29 页码:13
关键词	Cast thickness Abnormal fine grain Microstructure Microsegregation Mechanical properties
DOI	10.1016/j.mtcomm.2021.102916
通讯作者	Xie, Jun(junxie@imr.ac.cn) ; Yu, JinJiang(jjyu@imr.ac.cn)
英文摘要	The 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.
资助项目	National 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研究方向	Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000718046500001
资助机构	National 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
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167468]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xie, Jun; Yu, JinJiang
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 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.