Microsegregation of a new Ni-Co-based superalloy prepared through electron beam smelting and its homogenization treatment

Xinpeng Zhuang; Yi Tan; Longhai Zhao; Xiaogang You; Pengting Li; Chuanyong Cui

Journal of Materials Research and Technology (May 2020)

Microsegregation of a new Ni-Co-based superalloy prepared through electron beam smelting and its homogenization treatment

Xinpeng Zhuang,
Yi Tan,
Longhai Zhao,
Xiaogang You,
Pengting Li,
Chuanyong Cui

Affiliations

Xinpeng Zhuang: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, China
Yi Tan: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, China
Longhai Zhao: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, China
Xiaogang You: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, China; School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Pengting Li: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, China; Corresponding author.
Chuanyong Cui: Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China

Journal volume & issue: Vol. 9, no. 3
pp. 5422 – 5430

Abstract

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A new Ni-Co-based superalloy was prepared through electron beam smelting (hereinafter referred to as EBS Ni-Co superalloy). The microstructure and element distribution of the superalloy were characterized through optical microscopy (OM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Results show that the secondary dendrite arm spacings of the middle and upper parts of the ingot were 36.7 and 28.7 μm, respectively. Ti and W were seriously segregated into the interdendritic and dendritic core regions with the segregation coefficients of 0.60 and 1.49, respectively. Various precipitated phase, including (γ-γ′) eutectic, η phase, MC type carbide, Ce-rich phase, and Zr-rich phase precipitated in the interdendritic regions. Furthermore, the homogenization of the EBS Ni-Co superalloy has been studied at 1140 ℃. Segregation nearly eliminated after 40 h homogenization at 1140 ℃ because of the high diffusion coefficient of alloying elements.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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