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

IMR OpenIR

	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; 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.
	2017-03-01
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
卷号	30 期号:3 页码:280-288
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.; 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.
部门归属	[li, hai-tao] south china univ technol, guangzhou 510641, guangdong, peoples r china ; [li, hai-tao] guangdong power grid co ltd, guangzhou 510600, guangdong, peoples r china ; [liang, yong-chun ; zhong, wan-li] elect power res inst guangdong power grid corp, guangzhou 510080, guangdong, peoples r china ; [qin, xue-zhi ; guo, jian-ting ; zhou, lan-zhang] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [ren, wei-li] shanghai univ, shanghai 200072, peoples r china
关键词	Ni-based Superalloy Tensile Property Intermediate-low-temperature Ductility Minimum (Iltdm) Solidification Way Strain Rate Deformation Inhomogeneity
学科领域	Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China [51001101]; National Energy Administration Program of China [NY20150102]
收录类别	SCI
语种	英语
WOS记录号	WOS:000395918800010
引用统计	被引频次：7[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/321006/78256
专题	中国科学院金属研究所
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.
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, WL .(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.