中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure

文献类型:期刊论文

作者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.
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2018-03-07
卷号718页码:449-460
关键词Single-crystal Superalloys Primary Mc Carbide Al-mo Alloys Phase Creep Kinetics Precipitation Decomposition Behaviors Stability
ISSN号0921-5093
英文摘要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.; 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.
学科主题Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种英语
公开日期2018-06-05
源URL[http://ir.imr.ac.cn/handle/321006/79436]  
专题金属研究所_中国科学院金属研究所
通讯作者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.
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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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来源:金属研究所

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