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Effect of Nb on the microstructure and properties of Ti-Mo microalloyed high-strength ferritic steel

机译：铌对Ti-Mo微合金高强度铁素体钢组织和性能的影响

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摘要

The effects of Nb on the microstructure and mechanical properties of Ti-Mo microalloyed high strength ferritic steel were systematically investigated. It was found that Nb addition inhibited the bainite transformation and was beneficial for obtaining ferritic steel. Further, Nb accelerated the precipitation in austenite and finer ferrite grains were obtained in Ti-Nb-Mo steel. The strengthening mechanism analysis results of experimental steels showed that the precipitation hardening effect of the (Ti, Mo, Nb)C particles was remarkable due to their larger volume fraction, although their average particle size was greater than that of (Ti, Mo)C in Ti-Mo steel. With the decrease of coiling temperature from 650 °C to 550 °C, the grain refinement strengthening and precipitation hardening of experimental steels increased. When the coiling temperature was 550 °C, the ferritic steel with superior mechanical properties was obtained by means of Ti-Nb-Mo complex microalloying. And the tensile strength, yield strength, and elongation of the Ti-Nb-Mo ferritic steel were 755 MPa, 712 MPa, and 22%, respectively.
机译：系统地研究了Nb对Ti-Mo微合金高强度铁素体钢组织和力学性能的影响。发现添加Nb抑制了贝氏体相变，并且对于获得铁素体钢是有利的。另外，Nb促进了奥氏体中的析出，并且在Ti-Nb-Mo钢中获得了更细的铁素体晶粒。实验钢的强化机理分析结果表明，尽管（Ti，Mo，Nb）C颗粒的平均体积大于（Ti，Mo）C的颗粒，但由于其较大的体积分数，其沉淀硬化效果显着。在Ti-Mo钢中。随着卷取温度从650 C降至550 C，实验钢的细化强化和析出硬化增加。卷取温度为550℃时，通过Ti-Nb-Mo复合微合金化获得了力学性能优良的铁素体钢。 Ti-Nb-Mo铁素体钢的抗拉强度，屈服强度和伸长率分别为755 MPa，712 MPa和22％。

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  • 来源
    《Materials Science and Engineering》 |2018年第24期|148-155|共8页
  • 作者

    Huihui Huang; Gengwei Yang; Gang Zhao; Xinping Mao; Xiaolong Gan; Qilong Yin; Hang Yi;

  • 作者单位

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology,Wuhan Branch of Bao Steel Central Research Institute;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology,Wuhan Branch of Bao Steel Central Research Institute;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;

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  • 正文语种 eng
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  • 关键词

    Ferritic steel; High strength; Ti-Nb-Mo complex microalloying; Precipitation; Strengthening mechanism;

    机译：铁素体钢;高强度;Ti-Nb-Mo复合微合金化;析出;强化机理;

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