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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Boron on Austenite to Ferrite Transformation Behavior of Low Carbon Steel Under Continuous Cooling
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Influence of Boron on Austenite to Ferrite Transformation Behavior of Low Carbon Steel Under Continuous Cooling

机译：硼对连续冷却下低碳钢铁氧体转化行为的影响

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摘要

In the current work, the influence of boron on austenite to ferrite transformation behavior under continuous cooling condition and its associated features, e.g., final microstructure, mechanical properties, etc., in low carbon steel has been studied. The steels (C 0.04 wt.%, B 10-100 ppm) prepared in an open air laboratory furnace showed identical microstructures having ferrite grains of 20-25 A mu m. However, tensile test data indicate variation of yield strength and ultimate tensile strength with boron content. The yield point elongation and strain aging index both were found to decrease with increase in boron content or boron-to-nitrogen ratio. As the boron nitride precipitates stimulate the nucleation of ferrite phase, the dilation curves show an increase in austenite to ferrite transformation start temperature with boron content. The resulting microstructure and hardness value also corroborate the finding. Transmission electron microscopy findings revealed the presence of ultra-fine boron nitride (BN) precipitates in both grain boundary and grain body of the steel having boron concentration of 30 ppm and beyond. The presence of these precipitates also increased with boron content. Based on austenite decomposition behavior, related microstructure and hardness values it is conjectured that these BN precipitates may act as nucleating agent for polygonal ferrite during austenite decomposition, thereby softening the steel during fast cooling.
机译：在当前的工作中，研究了在连续冷却条件下对铁氧体转化行为的硼对铁氧体转化行为的影响及其相关特征，例如最终的微观结构，机械性能等，已经在低碳钢中进行。在露天实验室炉中制备的钢（C 0.04重量％，B 10-100ppm）显示出相同的微结构，具有20-25Aμm的铁氧体晶粒。然而，拉伸试验数据表明具有硼含量的屈服强度和最终拉伸强度的变化。发现屈服点伸长和菌株老化指数随着硼含量或硼 - 氮比的增加而降低。随着氮化硼沉淀物刺激铁氧体相的成核，扩张曲线显示奥氏体与铁氧体转化开始温度的奥氏体增加。所得到的微观结构和硬度值也证实了发现。透射电子显微镜发现显示出在晶粒边界和钢的晶界和硼浓度为30ppm及更远的晶粒中存在沉淀的存在。这些沉淀物的存在也随硼含量增加。基于奥氏体分解行为，觉得其在奥氏体分解过程中，这些BN沉淀物可以充当多边形铁氧体的成核剂，从而在快速冷却过程中柔化钢。

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