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Effects of Brazing Temperature on Microstructure and High-Temperature Strength of Joints Using a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy

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Abstract

A novel fourth-generation nickel-based single crystal superalloy was bonded by vacuum brazing at 1230 °C, 1260 °C and 1290 °C for 60 min using a new type of Co-based filler alloy. The effects of the brazing temperature on the microstructure and mechanical properties of the brazed joint were investigated. The brazed joint was mainly composed of the non-isothermal solidification zone (M3B2 type-boride, CrB boride, Ni3B boride and MC carbide), isothermal solidification zone (γ and γ' Phase) and base metal. With the increase of brazing temperature, the volume fraction of borides and γ' phase in the center of the joint decreased and increased, respectively. The high-temperature tensile test results show that the tensile strength of the joints was improved with increasing brazing temperature, and the maximum tensile strength of the joint was 766 MPa after brazing at 1290 °C for 60 min. Fracture observation shows that the fracture modes of the joints were the same, which belongs to the typical quasi cleavage fracture. The element distribution in the joint was homogenized to a certain extent at 1290 °C. The segregation of Si and Ru was found, but they were still dissolved in the γ solid solution. The experimental results help to better understand the microstructure characteristics of the novel fourth-generation nickel-based single crystal superalloy and provide guidance for further optimizing the process parameters of the brazed joint.

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Acknowledgements

The financial support from the National Natural Science Foundation of China (Grant Numbers 51871221); the National Key R&D Program of China (Grant Number 2017YFA0700704); and the National Science and Technology Major Project (Grant Numbers 2017-VI-0002-0072, J2019-VI-0023-0139 and J2019-VII-0004-0144) is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Z. P. Zhang & K. Q. Qiu

  2. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    Z. P. Zhang, J. D. Liu, Y. Y. Huang, J. G. Li, X. G. Wang, J. L. Liu, M. Wang, M. K. Zou & Y. Z. Zhou

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Zhang, Z.P., Liu, J.D., Qiu, K.Q. et al. Effects of Brazing Temperature on Microstructure and High-Temperature Strength of Joints Using a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy. Met. Mater. Int. 29, 444–456 (2023). https://doi.org/10.1007/s12540-022-01223-7

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