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Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy
Zhang, HW; Qin, XZ; Li, XW; Zhou, LZ; Li, XW (reprint author), Northeastern Univ, Dept Mat Phys & Chem, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China.; Li, XW (reprint author), Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China.; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2018-01-10
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume711Pages:303-312
AbstractThe effects of C, Zr and Y/Ce on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloys were investigated. The morphology of MC carbides does not change in as-cast alloys, as the C content is increased or the Zr is added. However, the Y/Ce additions promote the transformation of MC carbide morphology from blocky to script-like type. Compared with that in as-cast alloys, there is no obvious change in the morphologies of MC carbide or chemical compositions after heat treatment. The increasing of C content and the addition of Zr or Y/Ce significantly decreases and increases the amount of the gamma/gamma' eutectic, respectively. After a solid solution treatment and subsequently a two-stage aging treatment, the gamma' phase is characteristic with two kinds of shapes and sizes, and the volume fraction of cuboidal gamma' phase is much larger than that of spherical gamma' phases. More MC carbide and residual eutectic result from the decreasing of cuboidal gamma' phase volume fraction. The decrease in volume fraction of cuboidal gamma' phase is principally responsible for the reduction of the stress rupture property. In addition, script-like carbide and residual eutectic remaining after heat treatment play the secondary role in the degradation of the stress rupture properties. The less regularly arranged cuboidal gamma' phase can damage the stress rupture life to some extent. The spherical gamma' phase re-dissolves into gamma' matrix widening the spacing between large cuboidal gamma' phase, and the addition of Zr inhibits grain boundary sliding and cracking; these two facts are beneficial to the rupture elongation.; The effects of C, Zr and Y/Ce on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloys were investigated. The morphology of MC carbides does not change in as-cast alloys, as the C content is increased or the Zr is added. However, the Y/Ce additions promote the transformation of MC carbide morphology from blocky to script-like type. Compared with that in as-cast alloys, there is no obvious change in the morphologies of MC carbide or chemical compositions after heat treatment. The increasing of C content and the addition of Zr or Y/Ce significantly decreases and increases the amount of the gamma/gamma' eutectic, respectively. After a solid solution treatment and subsequently a two-stage aging treatment, the gamma' phase is characteristic with two kinds of shapes and sizes, and the volume fraction of cuboidal gamma' phase is much larger than that of spherical gamma' phases. More MC carbide and residual eutectic result from the decreasing of cuboidal gamma' phase volume fraction. The decrease in volume fraction of cuboidal gamma' phase is principally responsible for the reduction of the stress rupture property. In addition, script-like carbide and residual eutectic remaining after heat treatment play the secondary role in the degradation of the stress rupture properties. The less regularly arranged cuboidal gamma' phase can damage the stress rupture life to some extent. The spherical gamma' phase re-dissolves into gamma' matrix widening the spacing between large cuboidal gamma' phase, and the addition of Zr inhibits grain boundary sliding and cracking; these two facts are beneficial to the rupture elongation.
description.department[zhang, h. w. ; li, x. w.] northeastern univ, dept mat phys & chem, sch mat sci & engn, shenyang 110819, liaoning, peoples r china ; [zhang, h. w. ; li, x. w.] northeastern univ, key lab anisotropy & texture mat, minist educ, shenyang 110819, liaoning, peoples r china ; [zhang, h. w. ; qin, x. z. ; zhou, l. z.] chinese acad sci, inst met res, shenyang 110016, peoples r china
KeywordNickel-based Superalloy Incipient Melting Behavior Single-crystal Superalloy Low-cycle Fatigue Creep-properties Mechanical-properties Heat-treatment Elevated-temperatures Sx-superalloys Alloy
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China (NSFC) [51571058, 51231002, 51001101]; National High-tech R D Program [2012AA03A501]; Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China [ATM20170001]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79584
Collection中国科学院金属研究所
Corresponding AuthorLi, XW (reprint author), Northeastern Univ, Dept Mat Phys & Chem, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China.; Li, XW (reprint author), Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China.; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, HW,Qin, XZ,Li, XW,et al. Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,711:303-312.
APA Zhang, HW.,Qin, XZ.,Li, XW.,Zhou, LZ.,Li, XW .,...&Zhou, LZ .(2018).Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,711,303-312.
MLA Zhang, HW,et al."Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 711(2018):303-312.
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