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采用金相和扫描电镜等手段,对抽油机人字齿轮轴孔及外圆表面裂纹进行了分析.结果表明,退火温度过高,导致齿轮出现严重过热,在淬火应力的作用下使齿轮沿过热晶界开裂,形成表面裂纹.
The microstructure and scanning electron microscopy (SEM) were used to analyze the cracks on the shaft hole and the outer surface of the gear unit.The results show that the overheating of the gear occurs when the annealing temperature is too high, and under the action of quenching stress, Overheated grain boundary cracking, the formation of surface cracks.