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首页> 外文期刊>Journal of University of Science and Technology Beijing >Grain refinement of low carbon steel produced by CSP process
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Grain refinement of low carbon steel produced by CSP process

机译：CSP工艺生产的低碳钢的晶粒细化

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摘要

In comparison with conventional production for hot strips, compact strip production (CSP) brings about some new micro-structural phenomena. Investigations were carried out to clarify the grain refinement mechanism of low carbon steel strips produced by the EAF-CSP process. Samples, obtained from the same rolling stock during continuous rolling, were examined through SEM, TEM and XEDS. Thin slabs have a dominant columnar structure and the spacing of the secondary dendrite arms ranges from 90 to approx 125 mum. The average grain sizes for the central area of the samples from the 1st to 6th pass are 41.6, 25.2, 21.4, 20.2, 13.1, 6.7 mum, respectively. Large number of nanometer oxide and sulfide have been found in the low carbon steel produced by the CSP process. The grain refinement mechanism can be summarized as follows: finer solidification structure of the thin slab; austenite recrystallization at higher temperature and stain accumulation at lower temperature caused by the great reduction of single rolling pass during continuous rolling; nano-scaled precipitates of sulfide and oxide which drag grain boundaries of austenite or ferrite to prevent the grain coarsening.
机译：与传统的热轧带钢生产相比，紧凑型带钢生产（CSP）带来了一些新的微观结构现象。进行了研究以阐明通过EAF-CSP工艺生产的低碳钢带的晶粒细化机理。通过SEM，TEM和XEDS检查在连续轧制过程中从相同轧件获得的样品。薄板具有主要的柱状结构，并且第二枝晶臂的间距为90到约125微米。从第一遍到第六遍，样品中心区域的平均晶粒尺寸分别为41.6、25.2、21.4、20.2、13.1和6.7微米。在通过CSP工艺生产的低碳钢中发现了大量的纳米氧化物和硫化物。晶粒细化机理可归纳为：薄板坯的凝固组织更细;连续轧制过程中单道次轧制量的大幅度减少导致奥氏体在较高温度下再结晶，在较低温度下产生污点。纳米级的硫化物和氧化物沉淀物，会拖累奥氏体或铁素体的晶界，以防止晶粒粗化。

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