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Refining of Intermediate Transformation Microstructure by Relaxation Processing

机译：松弛法细化中间相变组织

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摘要

The influence of RPC (relaxation-precipitation-controlling phase transformation) processing parameters on the microstructure was studied by thermo-simulation for a low carbon Nb and Ti containing microalloyed steel. The semi-quantitative statistic work of the packet size was carried out by the aid of optical microscope. TEM, EBSD and SEM were applied to investigate the microstructure refinement, precipitation, the evolution of crystal defects configuration and their interaction during the relaxation. The results demonstrate that the steel is composed of ultra-fine bainite/martensite composite microstructure, and the microstructure could be refined markedly by RPC processing. The best thermo-simulation process for refinement in this experiment is deformation by 30% at 850℃, and then relaxing at this temperature for 60 to 200s. Increasing the reduction ratio from 30 to 60% or decreasing the deformation temperature to 800℃ would cause the optimized relaxation time to become shorter, and increasing the deformation temperature to 900℃ would cause the refinement effect to be weaker. It is also indicated that the nucleation, growing and coarsening of precipitates, and the dislocations polygonizing occur during the relaxation. Both two processes could be helpful to refine the intermediate transformation microstructure, and when these two processes corporate and promote each other, the optimized processing is obtained.
机译：通过热模拟研究了含碳低Nb和Ti的微合金钢的RPC（弛豫-沉淀-控制相变）工艺参数对组织的影响。借助光学显微镜进行数据包大小的半定量统计工作。 TEM，EBSD和SEM用于研究组织的细化，析出，晶体缺陷构型的演变及其在弛豫过程中的相互作用。结果表明，该钢是由超细贝氏体/马氏体复合组织组成，可通过RPC工艺对组织进行显着细化。在本实验中，用于细化的最佳热模拟过程是在850℃下变形30％，然后在该温度下松弛60到200s。将压下率从30％增加到60％或将变形温度降低到800℃会导致优化的松弛时间变短，而将变形温度提高到900℃会使细化效果变弱。还表明，在弛豫过程中发生了析出物的形核，生长和粗化，以及位错多晶化。这两个过程都可能有助于改善中间转变的微观结构，并且当这两个过程结合并相互促进时，可获得优化的过程。

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