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<p>The plowing effect critically impacts microstructure during final-pass broaching turbine disk tenon grooves of GH4169. SEM/EBSD analysis and crystal-based FE simulation revealed the simultaneous occurrence of plastic pile-up and surface cracks at a cutting depth of 0.01&#xa0;mm, accompanied by a 28.4% increase in average grain size (AGS) statistics during the plowing-to-shearing transition and an increase in surface roughness Sa from 0.2767&#xa0;μm to 0.6042&#xa0;μm. This mechanistic insight establishes criteria for surface integrity control in high-precision machining of high-temperature alloys.</p>

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Investigation on the microstructural evolution of machined surface for broaching GH4169 under critical State

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Weiguang Liu,
  • Zhen Meng,
  • Jing Ni,
  • Guozhen Liu,
  • Fugen Xu,
  • Bokai Lou,
  • Baotao Wang,
  • Xinghua Wu

摘要

The plowing effect critically impacts microstructure during final-pass broaching turbine disk tenon grooves of GH4169. SEM/EBSD analysis and crystal-based FE simulation revealed the simultaneous occurrence of plastic pile-up and surface cracks at a cutting depth of 0.01 mm, accompanied by a 28.4% increase in average grain size (AGS) statistics during the plowing-to-shearing transition and an increase in surface roughness Sa from 0.2767 μm to 0.6042 μm. This mechanistic insight establishes criteria for surface integrity control in high-precision machining of high-temperature alloys.