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Surface Morphology and Subsurface Microstructure Evolution When Form Grinding 20Cr2Ni4A Alloys.

Xiaodong Zhang1, Xiaoyang Jiang1, Maojun Li1

  • 1State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China.

Materials (Basel, Switzerland)
|January 8, 2023
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Summary
This summary is machine-generated.

This study investigates the form-grinding of 20Cr2Ni4A alloy gears, revealing how grinding parameters affect surface quality and microstructure. Optimized parameters are crucial for minimizing defects and achieving desired gear performance.

Keywords:
form grindinggrinding defectsmicrostructure evolutionsurface morphology

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Area of Science:

  • Materials Science
  • Manufacturing Engineering
  • Tribology

Background:

  • 20Cr2Ni4A alloy is essential for heavy-duty gears.
  • Limited data exists on its form-grinding machinability.
  • Understanding surface integrity is critical for gear longevity.

Purpose of the Study:

  • To analyze the form-grinding process of 20Cr2Ni4A alloy gears.
  • To investigate the impact of grinding parameters on surface morphology, roughness, and microstructure.
  • To identify mechanisms of surface and subsurface defect formation.

Main Methods:

  • Conducted form-grinding trials on 20Cr2Ni4A alloy transmission gears.
  • Varied grinding parameters (e.g., cutting depth, feed speed).
  • Analyzed surface morphology, roughness, and subsurface microstructure evolution.

Main Results:

  • Surface roughness decreased from tooth tip to root due to changing contact conditions.
  • Mechanical force and heat induced microstructural deformation and refinement.
  • Increased cutting depth and feed speed led to higher microstructural deformation and temperature.

Conclusions:

  • Grinding parameters significantly influence the surface integrity of 20Cr2Ni4A alloy gears.
  • Defect formation mechanisms include plastic flow, crushing, and adhesion.
  • Microstructure evolution is directly linked to grinding conditions and temperature.