Thermodynamic Analysis and Control of the Precipitation of TiN in Titanium-bearing Gear Steel
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摘要: 为了控制试验钢中TiN夹杂的析出,对TiN生成反应进行了热力学分析。结果表明,钢液在液相线温度以上不会自发生成TiN夹杂,在钢液凝固过程中,由于Ti、N元素在凝固前沿的富集,使得TiN夹杂的生成反应得以进行。在实际生产当中,为了减少TiN夹杂在两相区内的析出,应在控制钢中Ti、N含量的基础上,再适当加强连铸二冷速率,使钢液快速通过两相区(1 728~1 878 K)。同时,根据Scheil方程计算得到,试验钢在凝固过程中不析出TiN夹杂的条件为将钢中的钛氮浓度积控制在7.04×10-5以下。Abstract: The themodynamic analysis on titanium nitride’s formation was carried out in order to control its precipitation in the tested steel.The results show that no TiN inclusions can be found in molten steel at temperature above liquidus;during solidification of molten steel,thanks to the enrichment of Ti and N in the two-phase region,the formation reaction of TiN proceeds.So the best way to reduce precipitation of TiN in practical production is to control Ti and N contents in steel,and quicken the molten steel through two-phase region（1 728～1 787 K） by increasing secondary cooling rate during continuous casting.Calculation suggests that the value should be controlled below 7.04×10-5 to ensure no precipitation of TiN inclusion in the tested steel during solidification process.
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Key words:
- gear steel /
- TiN inclusion /
- molten steel solidification /
- thermodynamics /
- control /
- secondary cooling rate
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