Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy

doi:10.1016/j.jmst.2020.02.079

CORC > 金属研究所 > 中国科学院金属研究所

	Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy
	Li, Xiaoxiao 1,2; Ou, Meiqiong 1; Wang, Min 1; Zhang, Long 1; Ma, Yingche 1; Liu, Kui 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-01-10
卷号	60 页码:177-185
关键词	Nickel-based superalloy Boron addition Secondary ion mass spectrometry (SIMS) Grain boundary segregation Mechanical properties
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.02.079
通讯作者	Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
英文摘要	The effect of boron addition at 0, 0.007 wt. % and 0.010 wt. % on the microstructure and mechanical properties of K4750 nickel-based superalloy was studied. The microstructure of the as-cast and heat-treated alloys was analyzed by SEM, EPMA, SIMS and TEM. Lamellar M5B3-type borides were observed in boron-containing as-cast alloys. After the full heat treatment, boron atoms released from the decomposition of M5B3 borides were segregated at grain boundaries, which inhibited the growth and agglomeration of M23C6 carbides. Therefore, the M23C6 carbides along grain boundaries were granular in boron-containing alloys, while those were continuous in boron-free alloys. The mechanical property analysis indicated that the addition of boron significantly improved the tensile ductility at room temperature and stress rupture properties at 750 degrees C/430 MPa of K4750 alloy. The low tensile ductility at room temperature of OB alloy was attributed to continuous M23C6 carbides leaded to stress concentration, which provided a favorable location for crack nucleation and propagation. The improvement of the stress rupture properties of boron-containing alloys was the result of the combination of boron segregation increased the cohesion of grain boundaries and granular M23C6 carbides suppressed the link-up and extension of micro-cracks. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000594138800020
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/158722]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ma, Yingche; Liu, Kui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaoxiao,Ou, Meiqiong,Wang, Min,et al. Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,60:177-185.
APA	Li, Xiaoxiao,Ou, Meiqiong,Wang, Min,Zhang, Long,Ma, Yingche,&Liu, Kui.(2021).Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,60,177-185.
MLA	Li, Xiaoxiao,et al."Effect of boron addition on the microstructure and mechanical properties of K4750 nickel-based superalloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 60(2021):177-185.