Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content

doi:10.1016/j.jallcom.2018.07.162

IMR OpenIR

	Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content
	Zhang, H. W.1,2; Wu, Y. S.2; Qin, X. Z.2; Zhou, L. Z.2; Li, X. W.1
通讯作者	Qin, X. Z.(xzqin@imr.ac.cn) ; Li, X. W.(xwli@mail.neu.edu.cn)
	2018-10-30
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	767 页码:915-923
摘要	The effects of boron content on the microstructure and mechanical properties of a directionally solidified Ni-based superalloy were investigated. The increase of boron content significantly increases the amount of gamma/gamma' eutectic, impels the formation of multi-phase eutectic-like constituent, and promotes the morphological transformation of MC carbides from rod-like to blocky. After standard heat treatment, the incipient melting occurs in the high boron alloy, which can lower the dissolving temperature of gamma/gamma' eutectic. With increasing boron content, the volume fraction of secondary gamma' phase decreases significantly and the homogeneity and alignment of secondary gamma' show a decrease, and the tensile strengths at 900 degrees C decrease slightly mainly due to the strengthening effect of much more tertiary gamma' phases. The wide gamma matrix channel facilitates the movement of dislocations, which is somewhat beneficial to the elongation, while the incipiently melted region (IMR), the decreased volume fraction of secondary gamma' phase and the less homogeneity of secondary gamma' phase are rather harmful to the elongation. Consequently, the elongation is drastically reduced. The existence of a large amount of IMRs is principally responsible for the reduction of the stress rupture property. Tertiary gamma' phases re-dissolving in g matrix channel facilitates the movement of dislocations between large secondary gamma' phases, which is beneficial to the elongation of the alloys. In addition, the IMRs provide masses of crack sources, and consume the precipitation strengthening elements (Ti, Ta) and the solid solution strengthening elements (Cr, Wand Mo), which plays the major role in the degradation of the high-temperature tensile or stress rupture properties. (C) 2018 Elsevier B.V. All rights reserved.
关键词	Directionally solidified Ni-based superalloy Boron Microstructure High-temperature tension Stress rupture
资助者	National Natural Science Foundation of China (NSFC) ; National High-tech RD Program ; Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China
DOI	10.1016/j.jallcom.2018.07.162
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[51571058] ; National Natural Science Foundation of China (NSFC)[51001101] ; National High-tech RD Program[2012AA03A501] ; Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China[ATM20170001]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000446316500110
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/129899
专题	中国科学院金属研究所
通讯作者	Qin, X. Z.; Li, X. W.
作者单位	1.Northeastern Univ, Dept Mat Phys & Chem, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat,Minist Educ, Shenyang 110819, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Zhang, H. W.,Wu, Y. S.,Qin, X. Z.,et al. Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,767:915-923.
APA	Zhang, H. W.,Wu, Y. S.,Qin, X. Z.,Zhou, L. Z.,&Li, X. W..(2018).Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content.JOURNAL OF ALLOYS AND COMPOUNDS,767,915-923.
MLA	Zhang, H. W.,et al."Microstructures and high-temperature mechanical properties of a directionally solidified Ni-based superalloy: Influence of boron content".JOURNAL OF ALLOYS AND COMPOUNDS 767(2018):915-923.