中文摘要：

随着结构钢厚板厚度的增大,其韧性性能会变差,特别是在低温环境中更加明显,针对该问题进行了钢厚板冲击韧性的深入研究.对60～150 mm厚的钢板进行了低温下的冲击韧性试验,并且利用Boltzmann函数对试验结果进行拟合分析,得到不同试验条件下的韧脆转变温度及其变化规律.结果显示：钢厚板的冲击韧性随温度降低,板厚增大以及沿板厚度方向由表面到中心的位置变化而降低;结构钢厚板脆性特征明显,要引起足够重视.

英文摘要：

As thickness increases,impact resistance deteriorates,especially in low-temperature environments.Therefore,the impact resistance of thick steel plate should be investigated.An experimental study was conducted to determine the impact resistance of 60 ～ 150 mm thick plate at low temperatures.The results showed that impact resistance reduces with reductions in temperature,increases in thickness,and changes in the distance from the surface to the center along the thickness direction.Regression analysis with the Boltzmann equation was also investigated,deriving the ductile-brittle transition temperature under different conditions,given variations in plate thickness and center point.The tests clearly verified the brittle features of thick structural steel plate.This requires further attention by designers.