新型H380级别高强度钢轨热处理工艺的数值模拟

通过计算机数值模拟计算对H380级别热处理钢轨的淬火过程进行了分析。钢轨热处理过程是一种鉴于等温转变与连续冷却转变之间的"连续等温转变过程"。计算表明:对于H380级别热处理钢轨温降控制在200～250℃,钢轨轨头相变温度不应超过620℃,轨头抗拉强度取样位置处珠光体组织相变温度不应超过650℃,相变孕育期为22～30 s,在此段加强冷却强度,降低珠光体组织相变开始温度。有利于钢轨轨头淬硬层的深化,提高该级别热处理钢轨抗拉强度。

Numerical Simulation on Heat Treatment Process of H380 New High Strength Steel Rail

The quenching process of H380 grade heat-treated steel rails is analyzed by computer numerical simulation. The rail heat treatment process is a " continuous isothermal transformation process" between the isothermal transition and the continuous cooling transition. The calculation shows that the temperature drop of the H380 grade heat treatment steel rail is controlled at 200 ~ 250 °C , and the rail head phase transition temperature should not exceed 620°C , the pearlite structure phase transition temperature at the tensile strength sampling position at the rail head should not exceed 650°C, and the phase change incubation period is between 22 〜30 s. In this section, the cooling intensity is strengthened and the pearlite phase transition temperature is lowered. It is beneficial to the deepening of the hardened layer of the rail head, to increase tensile strength of the heat-treated rail of this grade.