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首页> 外文期刊>Metallurgical and Materials Transactions A >Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel
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Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

机译：热机械加工NbTi微合金钢的强化机理

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摘要

The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly.
机译：研究了变形温度对具有铁素体-珠光体显微组织的热机械加工NbTi微合金钢的显微组织和力学性能的影响。随着最终变形温度在1348K至1098K（1075°C至825°C）温度范围内降低，环境屈服应力没有显着变化，工作硬化速率降低，极限拉伸强度降低，并且断裂伸长率增加。这些机械性能的变化与微观结构参数（例如铁素体晶粒尺寸，固溶体浓度，沉淀物数量密度和位错密度）的变化相关。根据测得的微结构参数进行的计算表明，晶粒细化，固溶强化，析出强化和加工硬化分别对屈服应力贡献高达32 pct，高达48 pct，高达25 pct和小于3 pct。随着最终变形温度的降低，晶粒尺寸强化和固溶强化均增加，析出强化降低，并且加工硬化贡献没有显着变化。

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  • 来源
    《Metallurgical and Materials Transactions A》 |2015年第8期|3470-3480|共11页
  • 作者

    Andrii G. Kostryzhev; Olexandra O. Marenych; Chris R. Killmore; Elena V. Pereloma;

  • 作者单位

    Faculty of Engineering and Information Sciences School of Mechanical Materials and Mechatronic Engineering University of Wollongong">(1);

    UOW Electron Microscopy Centre University of Wollongong">(2);

    BlueScope Steel Limited">(3);

    Faculty of Engineering and Information Sciences School of Mechanical Materials and Mechatronic Engineering University of Wollongong">(1);

    UOW Electron Microscopy Centre University of Wollongong">(2);

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