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Effect of cellular recrystallization on tensile properties of a nickel-based single crystal superalloy containing Re and Ru

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Abstract

A nickel-based single crystal superalloy containing Re and Ru was cast in a directional solidification furnace. The single crystal specimens after standard heat treatment were grit blasted with different pressures and then heat treated at 1100 °C for 4 h under vacuum condition. The evolution of recrystal-lized microstructure and its effect on the tensile properties at 850 and 980 °C were investigated. After heat treatment, the cellular microstructure was observed, and the thickness of the cellular recrystallization zone increases with the increase in grit blasting pressure. The appearance of the cellular structure undermines the tensile properties. Both the tensile strength and elongation decrease with increasing the thickness of the cellular structure. The recrystallized grain boundaries can act as the channels for the crack initiation and propagation during tensile test. The low bearing capacity of recrystallized layers and the local stress concentration resulting from the notch effect of cracking were the main reasons for the decrease of tensile properties.

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Authors and Affiliations

  1. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, 100095, Beijing, China

    Zhen-xue Shi Ph.D. (Assoc. Prof.), Shi-zhong Liu, Xiao-dai Yue, Li-jie Hu, Wan-peng Yang, Xiao-guang Wang & Jia-rong Li

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  1. Zhen-xue Shi Ph.D.
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  2. Shi-zhong Liu
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Correspondence to Zhen-xue Shi Ph.D..

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Shi, Zx., Liu, Sz., Yue, Xd. et al. Effect of cellular recrystallization on tensile properties of a nickel-based single crystal superalloy containing Re and Ru. J. Iron Steel Res. Int. 24, 1059–1064 (2017). https://doi.org/10.1016/S1006-706X(17)30153-X

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30153-X

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