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<p>This study systematically investigates the grinding-induced microstructural evolution of a second-generation nickel-based single-crystal superalloy using a robotic arm manipulation system. The grinding process was conducted with precisely controlled parameters (e.g., grinding speed and feed rate), and multi-scale surface/subsurface characterization was performed using optical microscopy (OM), confocal laser scanning microscopy (CLSM), and scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDS) was employed to analyze elemental distribution variations in the subsurface region. Key findings reveal that: (i) A characteristic plastic deformation zone formed in the subsurface due to grinding force-dominated low-temperature plastic deformation, exhibiting elongated γ matrix and γ′ precipitates with narrowed channel widths, distinctly different from the matrix microstructure; (ii) The grinding force served as the primary mechanism inducing surface hardening; (iii) Thermal exposure resulted in significant microstructural alterations, including grain refinement and pronounced elemental redistribution, in both surface and subsurface layers compared to the original microstructure.</p>

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The experimental study on robotic grinding of nickel-based superalloy single crystals: Surface quality and microstructural changes under thermal exposure

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Qiang Zhao,
  • Yadong Gong,
  • Kaikai Xu,
  • Liya Jin,
  • Jibin Zhao,
  • Lei Zhao

摘要

This study systematically investigates the grinding-induced microstructural evolution of a second-generation nickel-based single-crystal superalloy using a robotic arm manipulation system. The grinding process was conducted with precisely controlled parameters (e.g., grinding speed and feed rate), and multi-scale surface/subsurface characterization was performed using optical microscopy (OM), confocal laser scanning microscopy (CLSM), and scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDS) was employed to analyze elemental distribution variations in the subsurface region. Key findings reveal that: (i) A characteristic plastic deformation zone formed in the subsurface due to grinding force-dominated low-temperature plastic deformation, exhibiting elongated γ matrix and γ′ precipitates with narrowed channel widths, distinctly different from the matrix microstructure; (ii) The grinding force served as the primary mechanism inducing surface hardening; (iii) Thermal exposure resulted in significant microstructural alterations, including grain refinement and pronounced elemental redistribution, in both surface and subsurface layers compared to the original microstructure.