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以地铁转向架材料P355NL1钢为研究对象,通过不同温度下的拉伸试验、冲击试验研究了温度对该种钢强度和冲击性能的影响,同时利用Boltzmann函数对试验结果进行拟合,分析得到材料的韧脆转变温度,并对拉伸和冲击断口形貌进进行了观测。结果表明:环境温度对P355NL1钢强韧性有明显影响,随着试验温度的降低,材料的抗拉强度和屈服强度逐渐增强,而冲击吸收能量呈降低趋势;材料的韧脆转变温度(DBTT),按照冲击吸收能量为-62.57℃,按照纤维断面率为-59.96℃;材料具有良好的低温韧性。
The subway bogie material P355NL1 was taken as the research object. Through the tensile test and the impact test at different temperatures, the influence of temperature on the strength and impact properties of the steel was studied. At the same time, the Boltzmann function was used to fit the test results. Of the ductile-brittle transition temperature, and the tensile and impact fracture morphology into the observation. The results show that the ambient temperature has a significant effect on the toughness of P355NL1 steel. With the decrease of the test temperature, the tensile strength and yield strength of the P355NL1 steel gradually increase, while the impact absorption energy decreases. The ductile-brittle transition temperature (DBTT) According to the impact absorption energy of -62.57 ℃, according to the fiber section rate of -59.96 ℃; material has good low temperature toughness.