针对目前使用广泛的GCr15高碳铬轴承滚子，提出了微细裂纹漏磁检测方法。运用COMSOL有限元软件仿真分析滚子微细裂纹的漏磁场特性，研究了磁化参数、裂纹尺寸对信号的影响，选用隧道磁电阻传感器（TMR）拾取信号。由于TMR在强背景磁场下容易超量程饱和，提出了一种测点区域近零磁场调控的TMR测磁方法。设计了线圈电磁磁化的偏置检测探头，建立测点区域自适应近零磁场环境，通过试验对比分析了探头偏置前后检测信号的幅值、信噪比等特征参数，结果表明探头性能得到了优化。

Aiming at the widely used GCr15 high-carbon chromium bearing rollers, a micro-crack magnetic flux leakage detection method was proposed. COMSOL finite element software was used to simulate and analyze the leakage magnetic field characteristics of roller micro-cracks, and the influence of magnetization parameters and crack size on the signal was studied. Tunneling magnetoresistance sensor (TMR) was used to pick up the signal. Since TMR is prone to over-range saturation under strong background magnetic field, a TMR magnetometry method with near-zero magnetic field regulation in the measuring point region was proposed. The offset detection probe with electromagnetic magnetization of the coil was designed, and the self-adaptive near-zero magnetic field environment of the measuring point area was established. The amplitude and signal-to-noise ratio of the detection signal before and after the probe offset were compared and analyzed through experiments, which showed that the performance of the probe was optimized.