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研究了车轮钢中白点的形成过程,制备了白点(氢压裂纹)的真实断口,并与含白点试样的各种断口进行了对比．结果表明,先形成氢鼓泡,然后从鼓泡壁产生微裂纹,它们互相连接形成白点．白点断口和含白点试样的断口概念不同,前者为准解理, 与氢致滞后开裂断口相同;后者则依赖断裂方式和试样厚度．钢中白点除了产生二次裂纹外,对各种断口形貌均无影响．车轮钢的滞后断裂由原子氢引起,与白点无关．
The formation process of white point in wheel steel was studied. The true fracture of white point (hydrogen pressure crack) was prepared and compared with the fracture of the specimen containing white point. The results show that hydrogen bubbles are formed first, and then micro-cracks are generated from the bubble walls, which are interconnected to form white spots. The concept of white point fracture is different from that of white point fracture. The former is quasi-cleaved, which is the same as the hydrogen induced hysteretic fracture. The latter depends on the fracture mode and specimen thickness. In addition to the secondary white steel crack point, the appearance of various fractures have no effect. Hysteresis breakage of wheel steel is caused by atomic hydrogen, independent of the white point.