Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering

doi:10.1016/j.matchar.2021.111510

IMR OpenIR

	Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering
	Mao, Qiang 1; Zhang, Mengchao 1; Zhi, Yaqian 1; Wang, Changshuai 2; Li, Hui 1
通讯作者	Li, Hui(huili@shu.edu.cn)
	2021-11-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	181 页码:10
摘要	The microstructure and high temperature tensile property of grain boundary engineering (GBE) treated GH984 alloy was studied by electron backscattering diffraction, scanning electron microscopy and transmission electron microscopy. After GBE treatment, the fraction of low Sigma coincidence site lattice (CSL) grain boundary increases from 43.1% to 76.9%. The grain boundary network and grain boundary precipitation distribution were optimized by GBE treatment. During aging at 800 degrees C for 160, 320 and 640 h, the needle-like ri phase and M23C6 carbide precipitated at grain boundaries, both have coherent orientation relationship with matrix. The morphology and distribution of precipitates at grain boundaries with various characters are different. The eta phase is parallel distributed along coherent Sigma 3 grain boundary, perpendicularly precipitated at both side of incoherent Sigma 3 grain boundary, while only precipitated at one side of Sigma 9, Sigma 27 and random grain boundaries. Few fine carbide particles precipitated at Sigma 3 grain boundary, the larger carbide precipitated at Sigma 9, Sigma 27 and random grain boundaries. The high temperature ductility of GBE sample is improved compared with that of solution annealed sample under the same aging treatment. According to the experimental results, the effects of grain boundary characters on the precipitation behaviors of eta phase and carbide, and their influences on the mechanical properties were discussed.
关键词	eta phase Carbide Grain boundary character Grain boundary engineering Nickel based superalloy
资助者	National Key Research and Development Program of China
DOI	10.1016/j.matchar.2021.111510
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2016YFB0700401]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:000706135100001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：24[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/321006/166570
专题	中国科学院金属研究所
通讯作者	Li, Hui
作者单位	1.Shanghai Univ, Sch Mat Sci & Engn, Key Lab Microstruct, Shanghai 200444, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Mao, Qiang,Zhang, Mengchao,Zhi, Yaqian,et al. Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering[J]. MATERIALS CHARACTERIZATION,2021,181:10.
APA	Mao, Qiang,Zhang, Mengchao,Zhi, Yaqian,Wang, Changshuai,&Li, Hui.(2021).Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering.MATERIALS CHARACTERIZATION,181,10.
MLA	Mao, Qiang,et al."Improve the ductility of a nickel based superalloy by optimizing secondary phase distribution through grain boundary engineering".MATERIALS CHARACTERIZATION 181(2021):10.