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首页> 外文期刊>ISIJ international >Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating
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Formation of Ultrafine Grained Dual Phase Steels through Rapid Heating

机译：快速加热形成超细晶粒双相钢

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摘要

In this study, ultrafine grained dual phase structures have been developed in a plain low carbon steel, 0.17C and 0.74Mn (wt pct). The approach is based on rapid heating of a very fine ferrite-carbide aggregate into the intercritical annealing region followed by water quenching. This rapid heat treatment results in an ultrafine grained dual phase steel with improved properties. The effect of thermomechanical processing parameters such as heating rate and intercritical annealing time on the microstructure and mechanical properties have been examined. The key factors contributing to the grain refinement are uniform distribution of nanosize cementite particles acting as potential sites for austenite nucleation as well as the limited time available for coarsening of the microstructure. The mechanical properties of the present ultrafine grained dual phase steel show an excellent combination of strength and uniform elongation because of considerable work hardening.
机译：在这项研究中，已经在普通低碳钢，0.17C和0.74Mn（wt pct）中开发了超细晶粒双相结构。该方法基于将非常细的铁素体-碳化物聚集体快速加热到临界退火区域中，然后进行水淬。这种快速的热处理导致了具有改进性能的超细晶粒双相钢。研究了热机械加工参数（如加热速率和临界退火时间）对组织和力学性能的影响。有助于晶粒细化的关键因素是充当奥氏体成核潜在位点的纳米尺寸渗碳体颗粒的均匀分布，以及有限的可用于组织粗化的时间。由于相当大的加工硬化，本发明的超细晶粒双相钢的机械性能显示出强度和均匀伸长率的优异组合。

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