Effect of Mo on microstructural stability of a 4th generation Ni-based single crystal superalloy

Yuan Cheng; Xinbao Zhao; Wanshun Xia; Quanzhao Yue; Yuefeng Gu; Xiao Wei; Hongbin Bei; Yingying Dang; Ze Zhang

Journal of Materials Research and Technology (Nov 2022)

Effect of Mo on microstructural stability of a 4th generation Ni-based single crystal superalloy

Yuan Cheng,
Xinbao Zhao,
Wanshun Xia,
Quanzhao Yue,
Yuefeng Gu,
Xiao Wei,
Hongbin Bei,
Yingying Dang,
Ze Zhang

Affiliations

Yuan Cheng: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Xinbao Zhao: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Corresponding author.
Wanshun Xia: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Quanzhao Yue: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Yuefeng Gu: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Corresponding author.
Xiao Wei: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Hongbin Bei: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Yingying Dang: Xi'an Thermal Power Research Institute Co. Ltd., Xi'an 710032, China
Ze Zhang: Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Journal volume & issue: Vol. 21
pp. 2672 – 2681

Abstract

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The microstructural stability during thermal exposure at 900 °C of Ni-based single crystal superalloys with various Mo content was investigated. The coarsening of γ′ precipitates and formation of TCP (topologically close-packed) phases were discussed in detail. The LSW theory and TIDC theory were applied to study the coarsening behavior of γ′ particles, and both models fitted well with the experimental results. Increasing Mo content enhanced the partitioning behavior of alloying elements, thus increasing the lattice misfit and interfacial stress of γ′/γ phases. Additionally, Mo addition also decreased γ′ coarsening rate by retarding the diffusion process of elements. However, Mo addition significantly promoted the precipitation of TCP phases, consuming massive solution strengthener elements, such as Re, W and Mo. TCP precipitation may significantly limit the creep life at 900 °C.

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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