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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of a novel 1000 MPa grade TMCP low carbon microalloyed steel with combination of high strength and excellent toughness
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Microstructure and mechanical properties of a novel 1000 MPa grade TMCP low carbon microalloyed steel with combination of high strength and excellent toughness

机译：兼具高强度和优异韧性的新型1000 MPa级TMCP低碳微合金钢的组织和力学性能

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摘要

A novel low carbon Nb-V-Ti-Cr microalloyed bainitic steel with yield strength of 1000 MPa and excellent low temperature toughness was successfully processed. Two cooling procedures were adopted to optimize the mechanical properties. The microstructural evolution, precipitation behavior, and strengthening mechanisms were systematically studied, and the fracture mechanisms were analyzed via combination of fractographs and deflection-load curves. The experimental results indicated that the steel subjected to cooling rate of 65 ℃/s and coiling temperature of ～ 380-400 ℃ resulted in superior mechanical properties. The yield strength, tensile strength, yield ratio, and elongation-to-fracture were 1058 MPa, 1192 MPa, 0.88, and 10.6%, respectively. The impact energy of the 1/4-size Charpy specimen and tested at -20 ℃ was 24 J. The ultra-high yield strength is primarily attributed to transformation strengthening from lower bainite and precipitation hardening from nano-scale (Nb,Ti)C precipitates. The excellent toughness is associated with lower bainite and acicular ferrite together with high fraction of large misorientation grain boundaries by controlling the coiling temperature.
机译：成功加工了屈服强度为1000 MPa，低温韧性优异的新型低碳Nb-V-Ti-Cr微合金贝氏体钢。采用了两种冷却程序来优化机械性能。系统地研究了组织演变，析出行为和强化机理，并结合分形仪和挠曲-载荷曲线分析了断裂机理。实验结果表明，该钢在65℃/ s的冷却速度和〜380-400℃的卷取温度下具有优异的机械性能。屈服强度，抗拉强度，屈服比和断裂伸长率分别为1058MPa，1192MPa，0.88和10.6％。 1/4尺寸夏比试样的冲击能在-20℃时为24J。超高屈服强度主要归因于下部贝氏体的相变强化和纳米级（Nb，Ti）C的沉淀硬化。沉淀。通过控制卷取温度，优异的韧性与较低的贝氏体和针状铁素体以及较大比例的大的取向不良晶界有关。

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  • 来源
    《Materials Science and Engineering》 |2014年第26期|123-130|共8页
  • 作者

    Hui Xie; Lin-Xiu Du; Jun Hu; R.D.K. Misra;

  • 作者单位

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    Laboratory for Excellence in Advanced Steel Research, Institute for Materials Research and Innovation, University of Louisiana at Lafayette, Lafayette, LA 70504-4130, USA;

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  • 正文语种 eng
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  • 关键词

    Ultra-high strength steel; Low carbon bainitic steel; Nano-scale precipitates; Toughness; TMCP;

    机译：超高强度钢;低碳贝氏体钢;纳米级沉淀;韧性;TMCP;

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