利用金相显微镜、电子显微镜、离子探针等方法对几种Cr-Ni结构钢大规格钢材的断口上亮带的性质及其对力学性能的影响进行了研究。实验结果表明这种缺陷是氢在钢坯上沿枝晶间发生偏聚引起的一种氢损伤。对钢的冲击值、面缩、延伸率等性能有明显的降低作用。 文中还对这种缺陷产生的机制以及消除途径作了较深入的讨论。
The investigations were conducted by TEM, SEM and IMP techniques on the problem of "bright band" defect found occasionally on the longitudinal macroscopic fracture surface in commercial Cr-Ni structural steels, e. g. 30CrMnSiNi, 40CrNiMo, 4SCrNi, etc. The influence of "bright band" on their mechanical properties has also been evaluated. Results showed that the "bright band" defect is the hydrogen damage which is caused by hydrogen interdendritic segregation during solidification of steel ingots. This defect may lower obviously the impact toughness, reduction of area as well as elongation of the steels. The mechanism of its formation and the prevention have been discussed.
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