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搜集具有不同组织结构特征的轴承套圈，用超声波测厚仪测其声速．分析声速与组织结构之间的对应关系，归纳出声速随球化退火组织不同而变化的规律。
Collect bearing rings with different organizational features and measure the speed of sound with an ultrasonic thickness gauge. Analysis of the corresponding relationship between the speed of sound and the structure of the organization, summed up the sound velocity changes with the ball annealing organization.