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Microstructural evidence of nano-carbides in medium carbon high silicon multiphase steels

机译：中碳高硅多相钢中纳米碳化物的微观结构证据

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摘要

High silicon steels containing 1.5-2 wt% silicon are considered to form carbide free bainite. However, the present work shows experimental evidence for the formation of nano-carbides in a series of medium carbon (0.61 wt%) high silicon (1.71 wt%) low alloy mixed phase steels with the help of transmission electron microscopy. The nano-carbide formation in bainite is attributed to the formation of inter-critical ferrite during continuous cooling, resulting in partitioning of carbon and silicon at the austenite-ferrite interface, leading to an increase in carbon and decrease in silicon at the austenite side of the interface. Due to diffusionless growth of supersaturated bainitic ferrite lath under para-equilibrium conditions, formation of bainite proceeds with higher carbon and lower silicon, allowing carbide formation in the bainite during subsequent holding at bainitic transformation temperature. Nano-carbides along with mixed phase microstructures are attributed to the excellent combination of high strength and high ductility in the present steels.
机译：包含1.5-2 wt％硅的高硅钢被认为可形成无碳化物的贝氏体。但是，本研究显示了通过透射电子显微镜在一系列中碳（0.61 wt％）高硅（1.71 wt％）低合金混合相钢中形成纳米碳化物的实验证据。贝氏体中纳米碳化物的形成是由于在连续冷却过程中形成了临界铁素体，导致碳和硅在奥氏体-铁素体界面处分配，导致碳的增加和硅在奥氏体侧的减少。接口。由于在准平衡条件下过饱和贝氏体铁素体板条的无扩散生长，贝氏体的形成伴随着较高的碳和较低的硅，从而在随后保持贝氏体转变温度的过程中在贝氏体中形成碳化物。纳米碳化物以及混合相的微观结构归因于本发明钢的高强度和高延展性的完美结合。

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  • 来源
    《Materials Science and Engineering》 |2017年第21期|237-247|共11页
  • 作者

    A. Varshney; S. Sangal; Gouthama; A.K. Pramanick; K. Mondal;

  • 作者单位

    GE Global Research, John F Welch Technology Centre, Bengaluru S60066, India;

    Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;

    Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;

    National Metallurgical Laboratory, Jamshedpur 831001, India;

    Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Mixed phase steel; Bainite; Carbides; Heat treatment; TEM;

    机译：混合相钢;贝氏体硬质合金热处理;透射电镜;

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