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首页> 外文期刊>ISIJ international >Microstructure evolution in a low carbon Nb-Ti microalloyed steel
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Microstructure evolution in a low carbon Nb-Ti microalloyed steel

机译：低碳Nb-Ti微合金钢的组织演变

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摘要

The micro mechanical properties, stability and three-dimensional (3D) morphology of intragranular ferrite was studied in a low carbon microalloyed steel utilizing nano indentation, three-dimensional reconstruction techniques along with LEO1 450 scanning electronic microscopy. The mixed microstructures of intragranular ferrite, granular bainite and lath or plate-like bainite was obtained in a Nb-Ti microalloyed steel, which was water cooled immediately after relaxation for a fixed time as hot deformation ended. The elastic modulus and hardness increased in the sequence of intragranular ferrite, granular bainite and lath or plate-like bainite by approximately 15 GPa and 0.6 GPa, respectively. On the contrary, the tempering treatment of the specimens showed that the stability of the mixed microstructures decreased in the sequence of intragranular ferrite, granular bainite and lath or plate-like bainite. The results of stability, elastic modulus and hardness indicated that intragranular ferrite was formed prior to bainite transformation. The intragranular ferrite thus effectively sectioned the prior austenite into many small zones and thus the bainite transformed at lower temperatures was restricted in the small zones. It is likely that the formation of lath or plate-like intragranular ferrite prior to bainite transformation played an important role in the refinement of mixed microstructures.
机译：在低碳微合金钢中，利用纳米压痕，三维重构技术以及LEO1 450扫描电子显微镜研究了晶内铁素体的微观力学性能，稳定性和三维（3D）形态。在Nb-Ti微合金钢中获得了晶粒内铁素体，粒状贝氏体和板条状或板状贝氏体的混合组织，随着热变形的结束，在松弛一定时间后立即对其进行水冷。晶内铁素体，粒状贝氏体和板条或板状贝氏体的弹性模量和硬度分别增加了约15 GPa和0.6 GPa。相反，样品的回火处理表明，混合组织的稳定性按粒内铁素体，粒状贝氏体和板条或板状贝氏体的顺序降低。稳定性，弹性模量和硬度的结果表明，在贝氏体转变之前就形成了晶内铁素体。晶内铁素体因此有效地将原始奥氏体切成许多小区域，因此在较低温度下转变的贝氏体被限制在小区域中。贝氏体转变之前，板条或板状颗粒内铁素体的形成可能在混合微观结构的细化中起着重要作用。

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