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首页> 外文期刊>ISIJ international >The Effect of Delay Time after Hot Rolling on the Grain Size of Ferrite
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The Effect of Delay Time after Hot Rolling on the Grain Size of Ferrite

机译：热轧后延迟时间对铁素体晶粒尺寸的影响

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摘要

It is necessary that the yield ratio (YR) of tire-resistant steel for construction is below 0.8. However, during the industrial production of tire-resistant steel, the rapid cooling rate of the laminar cooling configuration makes the ferrite grain become fine and increases the yield ratio (YR>0.8). In order to reduce the YR, by using Gleeble 1500 thermomechanical simulator the experiment of the effect of delay time after hot deformation on the grain size of ferrite was carried out. The results indicate that the hot deformation can increase the system free energy and the "ledges" generate at the grain boundary of deformed austenite, which leads to the increase of the ferrite nucleation rate and the refinement of ferrite grain However, with the increase of delayed time, that the release of deformation energy and the reduction of "ledges" would decrease ferrite nucleation rate and increase the grain size of ferrite. Based on the experimental results, the technology to prolong the delay time after hot rolling is adopted in the industry production. The tested results indicate that the technology is effective to reduce the YR of fire-resistant steel and the YR decreases to 0.79 from initial 0.84.
机译：建筑用轮胎用钢的屈服比（YR）必须低于0.8。但是，在轮胎工业用钢的工业生产中，层流冷却构造的快速冷却速率使铁素体晶粒变细并提高了屈服比（YR> 0.8）。为了降低YR，通过使用Gleeble 1500热机械模拟器对热变形后的延迟时间对铁素体晶粒度的影响进行了实验。结果表明，热变形可以增加系统自由能，在变形奥氏体晶界产生“壁架”，从而导致铁素体形核速率的提高和铁素体晶粒的细化。时间，释放变形能和减少“壁架”将降低铁素体的成核速率并增加铁素体的晶粒尺寸。根据实验结果，在工业生产中采用了延长热轧后延迟时间的技术。测试结果表明，该技术可有效降低耐火钢的YR，并将YR从最初的0.84降低至0.79。

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