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首页> 外文期刊>Materials Science and Engineering >Innovative processing of obtaining nanostructured bainite with high strength - high ductility combination in low-carbon-medium-Mn steel: Process-structure-property relationship
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Innovative processing of obtaining nanostructured bainite with high strength - high ductility combination in low-carbon-medium-Mn steel: Process-structure-property relationship

机译：低碳-中-锰钢中获得高强度-高延性组合纳米结构贝氏体的创新工艺：工艺-结构-性能关系

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摘要

The study focused on the processing how to obtain nanoscale bainite for improving mechanical properties of a low-carbon-medium-manganese steel with nominal chemical composition of Fe–0.07C–7.9Mn–0.14Si–0.05Al–0.002S–0.003P (wt%), using warm rolling, intercritical annealing and bainite transformation. The results indicated that, after bainitic hold at 330 °C for 2 h, the steel had a yield stress (σy) of 770 MPa and tensile stress (σTS) of 1130 MPa, with a high elongation-to-failure (ɛf) of 0.62 at strain rate of 1 × 10−3s−1. The product ofσTSandɛfwas high at 70 GPa %, which is twice that the value (30 GPa %) required for third generation advanced high-strength steels. Furthermore, it is remarkably higher than the reported value of 46 GPa% for steel with identical chemical composition. Microstructural observations indicated that the steel consisted of nanoscale lamellae with characteristics of radial arrangement of bainitic ferrite and retained austenite (RA) of average thickness of ~120 nm. The volume fraction of RA was as high as 32% with carbon concentration of 1.75 wt%. The bainitic isothermal temperature and time not only affected the bainite morphology but also the volume fraction, distribution, microstructure and carbon concentration of RA, which are responsible for superior combination of high strength and good ductility of the steel.
机译：该研究集中于如何获得纳米贝氏体以改善标称化学成分为Fe–0.07C–7.9Mn–0.14Si–0.05Al–0.002S–0.003P（C）的低碳-中-锰钢的机械性能的处理（ wt％），采用热轧，临界退火和贝氏体转变。结果表明，贝氏体在330°C保温2？h后，屈服应力（σy）为770 MPa，拉应力（σTS）为1130 MPa，断裂伸长率（ɛf）高。应变率为1×10-3s-1时为0.62。 σTS和ɛf的乘积高达70 GPa％，是第三代先进高强度钢所需值（30 GPa％）的两倍。此外，它明显高于化学成分相同的钢的报道值46 GPa％。显微组织观察表明，该钢由纳米级薄片组成，具有贝氏体铁素体的径向排列特征和平均厚度约为120 nm的残余奥氏体（RA）。 RA的体积分数高达32％，碳浓度为1.75 wt％。贝氏体等温温度和时间不仅影响贝氏体形态，而且影响RA的体积分数，分布，显微组织和碳浓度，这是钢的高强度和良好延展性的优良组合。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|267-276|共10页
  • 作者

    Y.X. Zhou; X.T. Song; J.W. Liang; Y.F. Shen; R.D.K. Misra;

  • 作者单位

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University;

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University;

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University;

    Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University;

    Department of Metallurgical, Materials and Biomedical Engineering, Laboratory for Excellence in Advanced Steel Research, University of Texas at El Paso;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Low-carbon-medium-manganese steel; Nanoscale bainite; Retained austenite; Bainitic treatment;

    机译：低碳中锰钢纳米贝氏体残余奥氏体贝氏体处理;

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