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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and strain behavior of a medium Mn TRIP/TWIP steel for excellent combination of strength and ductility
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Microstructure evolution and strain behavior of a medium Mn TRIP/TWIP steel for excellent combination of strength and ductility

机译：Mn中等强度TRIP / TWIP钢的组织演变和应变行为，具有出色的强度和延展性

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摘要

The structure-property relationship in a low carbon medium Mn steel subjected to annealing at temperatures from 700 to 850 degrees C was elucidated. The phase transformation kinetics, thermal stability, and strain behavior of reverted austenite were studied to obtain excellent combination of strength and ductility. The recovery and recrystallization of deformed bainite were observed. Reverse transformation from bainite to austenite occurred during the intercritical annealing process. With an increasing annealing temperature, the volume fraction of austenite first increased and reached the maximum of 65% at 775 degrees C, it then decreased sharply to 21% at 850 degrees C due to the weak Mn enrichment and coarsened grain size. Mn enrichment played a significant role in enhancing the thermal stability of reverted austenite. The maximum product of strength and ductility of 44.1 GPa% was obtained at 725-750 degrees C by adjusting the volume fraction and mechanical stability of austenite. The cooperative TRIP and TWIP effects contributed to the continuous strain hardening and local stress relaxation of this steel. In this way, the uniform elongation was greatly improved and resulted in a ductile fracture mode.
机译：阐明了在700到850摄氏度的温度下进行退火的低碳中型Mn钢中的结构-特性关系。研究了还原奥氏体的相变动力学，热稳定性和应变行为，以获得强度和延展性的出色组合。观察到变形贝氏体的恢复和再结晶。在临界退火过程中发生了从贝氏体到奥氏体的反向转变。随着退火温度的升高，奥氏体的体积分数首先增加，并在775摄氏度达到最大值的65％，然后由于Mn富集力弱和晶粒粗化，在850摄氏度急剧下降至21％。锰的富集在提高还原奥氏体的热稳定性方面起着重要作用。通过调节奥氏体的体积分数和机械稳定性，可以在725-750摄氏度下获得44.1 GPa％的强度和延展性的最大乘积。 TRIP和TWIP的协同作用有助于该钢的连续应变硬化和局部应力松弛。这样，均匀伸长率大大提高，并导致了韧性断裂模式。

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