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Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming
Alternative TitleMicrostructure and tensile properties of DD32 single crystal ni-base superalloy repaired by laser metal forming
Shiwei Ci1; Jingjing Liang1; Jinguo Li1; Yizhou Zhou1; Xiaofeng Sun1
2020
Source Publication材料科学技术:英文版
ISSN1005-0302
Volume42.0Issue:010Pages:23-34
AbstractIn this work,the microstructure and tensile properties of DD32 single-crystal(SC)superalloy repaired by laser metal forming(LMF)using pulsed laser have been studied in detail.The microstructures of the deposited samples and the tensile-ruptured samples were characterized by optical microscopy(OM),transmission electron microscope(TEM)and scanning electron microscope(SEM).Due to high cooling rate,the primary dendrite spacing in the deposited area(17.2μm)was apparently smaller than that in the substrate area(307μm),and the carbides in the deposited samples were also smaller compared with that in the substrate area.The formation of(γ+γ’)eutectic in the initial layer of repaired SC was inhibited because of the high cooling rate.As the deposition proceeded,the cooling rate decreased,and the(γ+γ’)eutectic increased gradually.The(γ+γ’)eutectic at heat-affected zone(HAZ)in the molten pool dissolved partly because of the high temperature at HAZ,but there were still residual eutectics.Tensile test results showed that tensile behavior of repaired SC at different temperatures was closely related to the MC carbides,solidification porosity,γ’phase,and(γ+γ’)eutectic.At moderate temperature,the samples tested fractured preferentially at the substrate area due to the fragmentation of the coarse MC carbide in the substrate area.At elevated temperature,the(γ+γ’)eutectic and solidification porosity in the deposited area became the source of cracks,which deteriorated the high-temperature properties and made the samples rupture at the deposited area preferentially.
KeywordDD32 Pulsed-laser Repairing Single-crystal superalloy Microstructures Tensile property
DOI10.1016/j.jmst.2020.01.003
Indexed ByCSCD
Language中文
Funding Project[National Key R&D Program of China] ; [National Natural Science Foundation of China (NSFC)] ; [National High TechnologyResearch and Development Program ("863")] ; [Fund of the State Key Laboratory of Solidification Processing in NWPU]
WOS IDWOS:000526956200003
CSCD IDCSCD:6758220
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/90103
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.School of Materials Science and Engineering,University of Science and Technology of China
3.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University
4.Space Manufacturing Technology(CAS Key Lab
Recommended Citation
GB/T 7714
Shiwei Ci,Jingjing Liang,Jinguo Li,et al. Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming[J]. 材料科学技术:英文版,2020,42.0(010):23-34.
APA Shiwei Ci,Jingjing Liang,Jinguo Li,Yizhou Zhou,&Xiaofeng Sun.(2020).Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming.材料科学技术:英文版,42.0(010),23-34.
MLA Shiwei Ci,et al."Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming".材料科学技术:英文版 42.0.010(2020):23-34.
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