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Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming

Ci Shiwei ^1,2 Liang Jingjing ^1,3,4 ^* Li Jinguo ^1,4 Zhou Yizhou ¹ ^* Sun Xiaofeng ¹

文摘	In 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 (17.2 μm) was apparently smaller than that in the substrate area (307 μm), 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.
来源	Journal of Materials Science & Technology ,2020,45:23-34 【核心库】
DOI	10.1016/j.jmst.2020.01.003
关键词	DD32 ; Pulsed-laser ; Repairing ; Single-crystal superalloy ; Microstructures ; Tensile property
地址	1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016 2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026 3. Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Xi'an, 710072 4. Space Manufacturing Technology (CAS Key Lab), Space Manufacturing Technology (CAS Key Lab), Beijing, 100094
语种	英文
文献类型	研究性论文
ISSN	1005-0302
学科	金属学与金属工艺
基金	supported by the National Key R&D Program of China ; the National Key R&D Program of China ; 国家自然科学基金 ; the National High Technology Research and Development Program (“863”) ; 西北工业大学凝固技术国家重点实验室开放基金
文献收藏号	CSCD:6758220

参考文献共 35 共2页

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