Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways

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	Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways
	Li, Hai-Tao ; Liang, Yong-Chun ; Zhong, Wan-Li ; Qin, Xue-Zhi ; Guo, Jian-Ting ; Zhou, Lan-Zhang ; Ren, Wei-Li
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2017-03-01
卷号	30 期号:3 页码:280-288
关键词	Ni-based superalloy Tensile property Intermediate-low-temperature ductility minimum (ILTDM) Solidification way Strain rate Deformation inhomogeneity
ISSN号	1006-7191
通讯作者	Qin, XZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China. ; Ren, WL (reprint author), Shanghai Univ, Shanghai 200072, Peoples R China.
中文摘要	The tensile properties and deformation behavior of several cast Ni-based superalloys, respectively, in the equiaxed, columnar-crystal and single-crystal styles are comparatively studied. The effects of solidification way, heat treatment and strain rate on the tensile properties are discussed in detail. It is found that the reduction of grain boundaries by the feasible solidification ways offers cast Ni-based superalloys the potential capability of improving the mechanical properties, the ultimate achievement of which is also confirmed to lie on the appropriate modifications of chemical composition and heat treatment. The prolongation of solid solution facilitates the precipitation of fine secondary gamma' phase, whereas the extension of high-temperature aging leads to the coarsening of secondary gamma' phase. The combination of these two aspects has a crucial influence on the tensile properties. Under tensile applied stress, the surface grains of DZ-A alloy deform slightly, while the inner grains deform heavily. This deformation inhomogeneity is ascribed to the occurrence of cracks or oblique grains near the surface of specimens and the sliding or decohesion of grain boundaries between the surface and inner grains. Regardless of strain rate, the ILTDM (intermediate-low-temperature ductility minimum) phenomenon always happens in the temperature range from 400 to 600 degrees C in all the investigated alloys, the occurrence of which is closely related to the strong strain-hardening behavior in the deformation process. Finally, the interaction of slip bands which are the main deformation mode below 600 degrees C is established to be the essential reason for the strain hardening.
学科主题	Metallurgy & Metallurgical Engineering
收录类别	SCI
资助信息	National Natural Science Foundation of China [51001101]; National Energy Administration Program of China [NY20150102]
语种	英语
公开日期	2017-08-17
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78256]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Li, Hai-Tao,Liang, Yong-Chun,Zhong, Wan-Li,et al. Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2017,30(3):280-288.
APA	Li, Hai-Tao.,Liang, Yong-Chun.,Zhong, Wan-Li.,Qin, Xue-Zhi.,Guo, Jian-Ting.,...&Ren, Wei-Li.(2017).Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways.ACTA METALLURGICA SINICA-ENGLISH LETTERS,30(3),280-288.
MLA	Li, Hai-Tao,et al."Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways".ACTA METALLURGICA SINICA-ENGLISH LETTERS 30.3(2017):280-288.