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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; 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
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume30Issue:3Pages:280-288
AbstractThe 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.
description.department[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
KeywordNi-based Superalloy Tensile Property Intermediate-low-temperature Ductility Minimum (Iltdm) Solidification Way Strain Rate Deformation Inhomogeneity
Subject AreaMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51001101]; National Energy Administration Program of China [NY20150102]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78256
Collection中国科学院金属研究所
Corresponding AuthorQin, 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.
Recommended Citation
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.
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