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Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure
Zhang, HW; Qin, XZ; Wu, YS; Zhou, LZ; Li, XW; Li, XW (reprint author), Northeastern Univ, Dept Mat Phys & Chem, Sch Mat Sci & Engn, Minist Educ, 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.; Qin, XZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-03-07
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume718Pages:449-460
AbstractThe effects of Cr addition on the microstructure and stress rupture property during long-term thermal exposure have been investigated in a directionally solidified Ni-based superalloy. The increment of Cr content resulting in the excessive precipitation of s phase is the principal reason for the catastrophic reduction in the stress rupture properties. The amounts of rounded cuboidal gamma' and its coalescence increase, but the tendency of gamma' alignment decreases with the increment of Cr content, which leads to the reduction of the stress rupture property to some degree. The change of lattice misfit shows a good agreement with the change of gamma' morphology and the tendency of gamma' alignment. The change of gamma' shape is accompanied by the increase of the misfit dislocation density, which causes the rise of gamma' coalescence. The increase of Cr content can promote the formation of M23C6 or M6C in the vicinity of degenerating primary MC. Thus, the increased Cr content facilitates the decomposition of primary MC, which deteriorates the stress rupture properties. In addition, the increase of Cr content can promote the formation M23C6 and M6C along gain boundaries (GBs), facilitating the formation of a semicontinuous carbide chain to some degree and broadens GBs and thus promoting the crack nucleation at GBs, which plays a certain role in the degradation of the stress rupture properties.; The effects of Cr addition on the microstructure and stress rupture property during long-term thermal exposure have been investigated in a directionally solidified Ni-based superalloy. The increment of Cr content resulting in the excessive precipitation of s phase is the principal reason for the catastrophic reduction in the stress rupture properties. The amounts of rounded cuboidal gamma' and its coalescence increase, but the tendency of gamma' alignment decreases with the increment of Cr content, which leads to the reduction of the stress rupture property to some degree. The change of lattice misfit shows a good agreement with the change of gamma' morphology and the tendency of gamma' alignment. The change of gamma' shape is accompanied by the increase of the misfit dislocation density, which causes the rise of gamma' coalescence. The increase of Cr content can promote the formation of M23C6 or M6C in the vicinity of degenerating primary MC. Thus, the increased Cr content facilitates the decomposition of primary MC, which deteriorates the stress rupture properties. In addition, the increase of Cr content can promote the formation M23C6 and M6C along gain boundaries (GBs), facilitating the formation of a semicontinuous carbide chain to some degree and broadens GBs and thus promoting the crack nucleation at GBs, which plays a certain role in the degradation of the stress rupture properties.
description.department[zhang, h. w. ; li, x. w.] northeastern univ, dept mat phys & chem, sch mat sci & engn, minist educ, 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. ; wu, y. s. ; zhou, l. z.] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china
KeywordSingle-crystal Superalloys Primary Mc Carbide Al-mo Alloys Phase Creep Kinetics Precipitation Decomposition Behaviors Stability
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79436
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, Minist Educ, 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.; Qin, XZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, HW,Qin, XZ,Wu, YS,et al. Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,718:449-460.
APA Zhang, HW.,Qin, XZ.,Wu, YS.,Zhou, LZ.,Li, XW.,...&Qin, XZ .(2018).Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,718,449-460.
MLA Zhang, HW,et al."Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 718(2018):449-460.
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