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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (4): 525610-525610.doi: 10.7527/S1000-6893.2021.25610

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Progress on high energy beam repair of single crystal turbine blades

ZHANG Peiyu, ZHOU Xin, LI Yinghong   

  1. Science and Technology on Plasma Dynamics Laboratory, College of Aeronautical Engineering, Air Force Engineering University, Xi'an 710038, China
  • Received:2021-03-30 Revised:2021-04-28 Published:2021-06-29
  • Supported by:
    National Natural Science Foundation of China (91860136, 51801231); Key Science and Technology Project of Shaanxi Province (2018zdzx01-04-01)

Abstract: As one of the most challenging tasks in the field of special processing for hot-section aero-engines parts, high-energy beam additive remanufacturing is the main way to repair damages such as wear, ablation and cracks of single crystal turbine blades. However, several scientific issues and key processes including epitaxial growth, defect formation mechanism, and their control methods, have not yet been completely broken through. In this paper, we sort out the development history of the rapid solidification theories. Based on the principles of columnar-to-equiaxed transition and oriented to misoriented transition, we establish a fundamental framework for high-energy beam repair of single crystal. After analyzing the intrinsic relationship among repair processes, melt pool characteristics and solidification structures in detail, we propose the process control criteria and monitoring method to maintain the continuous and stable growth of single crystal and summarize the of microstructure (e.g., γ'-phases) and defects (e.g., hot cracks and pores) development in the repaired zone, and the main challenges in single crystal repair. In addition, several major foreign research plans related to remanufacturing of aero-engines components are introduced, and future development trends are prospected.

Key words: single-crystal turbine blade, high-energy beam repair, additive manufacturing, solidification structures, metallurgical defects, process control, melt-pool monitoring

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