Features of Grinding White Layer and Its Correlation with AcousticEmission Signal

doi:10.3901/JME.2023.09.349

Abstract

Abstract: Grinding white layer seriously affects the service performance and life of the parts. To study the physical nature of grinding white layer and reveal the correlation between features of grinding white layer and spectrum amplitude of acoustic emission (AE) signal, grinding experiments of hardened GCr15 bearing steel are carried out to observe the characteristics of grinding white layer and reveal the frequency law of acoustic emission signal under the coupling effect of grinding mechanical extrusion and grinding heat. The results show that the microstructure of white layer is denser. The corrosion resistance and microhardness of white layer are superior to those of dark layer and matrix material. The grinding white layer is synergistically affected by grinding temperature and plastic deformation. When grinding temperature is lower than the nominal phase transition temperature of the workpiece material, the grinding white layer also appears under the induction of severe plastic deformation. The thickness of white layer increases suddenly when grinding temperature exceeds the nominal phase transition temperature. During grinding, the acoustic emission signal is synergistically affected by mechanical extrusion stress and thermal stress, the amplitude in low frequency band is mainly determined by mechanical extrusion stress, and the amplitude in high frequency is mainly affected by thermal stress. When grinding temperature exceeds the nominal phase transition temperature, the internal energy of molecules/atoms in workpiece increases significantly, resulting in disordered high-frequency vibration, and the high-frequency amplitude increases sharply. The correlation between the high-frequency amplitude of acoustic emission signal and the thickness of white layer is revealed. According to whether there is a mutation of high-frequency amplitude in grinding process, the appearance of phase transformation and thick white layer at surface and sub-surface can be judged. Online monitoring method is provided for grinding with controllable white layer thickness.

Key words: grinding, white layer, acoustic emission, spectrum amplitude, microstructure

CLC Number:

TG580

MAO Cong, SUN Pengcheng, TANG Weidong, ZHANG Mingjun, LUO Yuanqiang, HU Yongle, ZHANG Dejia, TANG Kun, GUAN Furu. Features of Grinding White Layer and Its Correlation with AcousticEmission Signal[J]. Journal of Mechanical Engineering, 2023, 59(9): 349-359.

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