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当热轧钢轨钢中的氢原子扩散到空隙中,变成分子氢,氢气的压力超过临界值时,在钢轨钢中就会形成发裂.在温度低于200℃时,会产生裂纹.钢水实行真空脱气处理或将热轧钢轨放在保温的缓冷坑内进行缓慢控制冷却,可以把氢脱到“安全”的数值,即低于引起裂纹的临界浓度.但是,对防止比较软的标准的C-Mn钢轨钢产生裂纹有效的冷却条件,却根本不适用于比较硬的优质合金钢轨。因此,拟定了Cr-Si-V合金钢轨和标准C-Mn钢轨的脱氢试验计划,以便研究一种计算冷却条件的方法,在这种冷却条件下将浓度已知的,但浓度比较高的氢降到安全的数值,对模拟轨头的热轧钢板进行了等温和控制冷却的试验.根据其他的长时间试验,得到了空隙吸收氢的估计值。推导出一些公式,根据这些公式,可以计算将已知浓度的氢减少的控制冷却条件。钢轨生产厂可以应用类似的方法。
When hydrogen atoms in the hot-rolled rail steel diffuse into the voids and become molecular hydrogen, cracking of the rail steel occurs when the pressure of the hydrogen exceeds the critical value, and cracking occurs at temperatures below 200 ° C. The molten steel Controlled cooling by vacuum degassing or by placing hot-rolled rails in insulated hold-down pits can be used to remove hydrogen to “safe” values below the critical concentration causing cracking. However, for softer standards Of the C-Mn rail cracks produce effective cooling conditions, but simply not suitable for relatively hard high-quality alloy rail. Therefore, a plan for dehydrogenation testing of Cr-Si-V alloy rails and standard C-Mn rails was developed in order to study a method of calculating the cooling conditions under which concentrations of known but relatively high concentrations Hydrogen down to a safe value, the simulation of the head of hot-rolled steel plate isothermal control cooling test.According to other long-term test, get the gap to absorb hydrogen estimate. Derived some formula, according to these formulas, can be calculated to reduce the known concentration of hydrogen controlled cooling conditions. A similar method can be applied to rail manufacturing plants.