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<p>The directionally solidified superalloy DZ125 serves as a critical material for the fabrication of gas turbine blades in aeroengines. In this study, the investigation into grindability of nickel-based cast superalloy DZ125 was investigated in terms of grinding force and surface/subsurface damage behavior by using alumina grinding wheels. Experimental results indicate that increasing the workpiece infeed speed (3-12&#xa0;m/min) and grinding depth (10-50&#xa0;μm) significantly increases the grinding force (from 29 to 203 N) and surface roughness Ra (from 0.485 to 1.202&#xa0;μm). The primary surface defects observed include micro-pits, adhered wear debris, and deep grooves. Furthermore, subsurface examination of DZ125 alloy reveals that the severe deformation zone (SDZ) (~ 5&#xa0;μm deep) can be categorized into three distinct regions: severe plastic deformed zone, plastic deformed zone, and dislocation zone. The corresponding crystal textures are nanograins, subgrains and various dislocation structures. In addition, grain refinement occurs in subsurface with the evolution process that large-sized grains first bend, then split into subgrains, and eventually transform into nanoscale grains. This process is driven by the dislocation movement resulting from plastic deformation during grinding. Finally, the microhardness evaluation demonstrates that there exists a work hardening layer in subsurface of DZ125 alloy, with the hardening level of 17.9-27.3%. The findings of this study contribute to an enhanced understanding of the grinding performance of DZ125 alloy.</p>

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Understanding the Grindability of Nickel-Based Cast Superalloy DZ125: Grinding Force and Surface/Subsurface Damage Behavior

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Mengbin Lu,
  • Qing Miao,
  • Chenwei Dai,
  • Zhen Yin

摘要

The directionally solidified superalloy DZ125 serves as a critical material for the fabrication of gas turbine blades in aeroengines. In this study, the investigation into grindability of nickel-based cast superalloy DZ125 was investigated in terms of grinding force and surface/subsurface damage behavior by using alumina grinding wheels. Experimental results indicate that increasing the workpiece infeed speed (3-12 m/min) and grinding depth (10-50 μm) significantly increases the grinding force (from 29 to 203 N) and surface roughness Ra (from 0.485 to 1.202 μm). The primary surface defects observed include micro-pits, adhered wear debris, and deep grooves. Furthermore, subsurface examination of DZ125 alloy reveals that the severe deformation zone (SDZ) (~ 5 μm deep) can be categorized into three distinct regions: severe plastic deformed zone, plastic deformed zone, and dislocation zone. The corresponding crystal textures are nanograins, subgrains and various dislocation structures. In addition, grain refinement occurs in subsurface with the evolution process that large-sized grains first bend, then split into subgrains, and eventually transform into nanoscale grains. This process is driven by the dislocation movement resulting from plastic deformation during grinding. Finally, the microhardness evaluation demonstrates that there exists a work hardening layer in subsurface of DZ125 alloy, with the hardening level of 17.9-27.3%. The findings of this study contribute to an enhanced understanding of the grinding performance of DZ125 alloy.