Abstract
Research on microstructure of material removal process is the key to aerospace high-performance manufacturing because of the limitation of relative linear speed of tool and workpiece for small-size parts. The polycrystalline grinding model of Fe-Ni maraging steel was established by 3D molecular dynamics simulation method. The effects of parameter combinations on force, temperature, microstructure and dislocation were researched based on the simulation results. The grinding surface and subsurface were defined as the chips, subsurface damage (SSD) layer and intact layer of workpiece according to the damage degree of the microstructure, and the evolution mechanism of microstructure of different regions was studied emphatically. The results indicate that most energy of micro-nano grinding is consumed for the influence on the crystal structure of material. The main factors of the damage of microstructure is the cutting depth of single grit, and the increase of linear velocity gradually decreases its influence on the microstructure with a cutting depth larger than 1.8 nm. The shallower cutting depth and higher grinding speed are the better parameter combinations, which result in the reduction of SSD thickness, and the surface BCC structure, dislocation density and grinding efficiency are maintained with a slight increase in force and temperature.
Published Version
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