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首页> 外文期刊>Iron & Steel Review >Process Optimisation for Microstructure Evolution of Annealed Cold Rolled Steel
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Process Optimisation for Microstructure Evolution of Annealed Cold Rolled Steel

机译：退火冷轧钢组织演变的工艺优化

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Bokaro Steel Plant is in progress on machinery rehabilitation in different mill sections and commissioning of new 1.2 MTcold rolling mill (CRM) which will be used to produce high-quality steel grades for applications in the automotive industry. The new rolling mill consists of a coupled pickling line-tandem cold mill (PLTCM), an electrolytic cleaning line (ECL), bell annealing furnace (BAF) and a hot dip galvanizing line (HDGL). The purpose of this study is to assess the impact of the cold rolling reduction of 80-92% and hydrogen annealing in BAF with high efficiency of heat transfer on mechanical properties of low carbon grade steel and then aim to characterise the microstructural evolution of the material for annealing process optimisation. Mechanical properties such as yield stress, ultimate tensile stress, elongation, hardness and rebar have been evaluated in different grades of low carbon steel processed under different conditions. These results are then verified by microstructural characterisation, using techniques such as optical microscopy, electron backscatter diffraction (EBSD) in the scanning electron microscope (SEM) and transmission electron microscopy (TEM). Heat treatment with controlled rate of cooling for arresting grain growth and surface modification are the key technologies to enhance the effective use of materials and to achieve the desired properties of the material used in the automotive industries. The tested parameters of annealing, mainly temperature and time together with other factors like total cold reduction have the decisive influence on the microstructure and hence mechanical properties after annealing. Strength and drawability properties of the material decrease with increase in annealing temperature, whereas on the contrary, plastic properties increase.
机译：Bokaro钢铁厂正在进行不同轧机区段的机械修复，并正在调试新的1.2吨冷轧机（CRM），该轧机将用于生产用于汽车行业的高质量钢种。新轧机由酸洗线串联冷轧机（PLTCM），电解清洗线（ECL），钟罩式退火炉（BAF）和热浸镀锌线（HDGL）组成。这项研究的目的是评估具有高传热效率的BAF中的80-92％的冷轧压下率和氢退火对低碳级钢的力学性能的影响，然后表征材料的微观组织演变用于优化退火工艺。已在不同条件下加工的不同等级的低碳钢中评估了机械性能，例如屈服应力，极限拉伸应力，伸长率，硬度和钢筋。然后，通过使用光学显微镜，扫描电子显微镜（SEM）和透射电子显微镜（TEM）中的电子背散射衍射（EBSD）等技术，通过微结构表征来验证这些结果。用于控制晶粒生长和表面改性的控制冷却速率的热处理是关键技术，可提高材料的有效利用并实现汽车行业所用材料的所需性能。退火的测试参数（主要是温度和时间）以及其他因素（如总冷轧量）对退火后的组织和机械性能具有决定性的影响。材料的强度和可拉伸性随退火温度的升高而降低，相反，塑性却提高。

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