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首页> 外文期刊>Materials Science and Engineering >Carbide precipitation in Nb-V-Ti microalloyed ultra-high strength steel during tempering
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Carbide precipitation in Nb-V-Ti microalloyed ultra-high strength steel during tempering

机译：Nb-V-Ti微合金超高强度钢回火过程中的碳化物析出

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摘要

The microstructure, precipitates and mechanical properties of Nb-V-Ti microalloyed ultra-high strength steel under different tempering temperatures are investigated. With the increasing tempering temperature, the width of martensitic laths gradually increased with reduced dislocations within them, and the volume fraction of retained austenite first increased and then decreased. Furthermore, the Charpy impact toughness, reduction of area and elongation are enhanced at the sacrifice of the strength. Four kinds of precipitates are identified at different tempering temperatures, namely M_3C, M_2C, M_(23)C_6 and M_7C_3. M_3C precipitated when tempering at 200-400 ℃, and it was replaced partially by M_2C when the temperature is elevated to 500 ℃, at which M_(23)C_6 also precipitated. For a higher temperature, above 600 ℃, M_3C disappeared, and some M_2C transformed into M_7C_3. The other two types of MC precipitates are found to be the stable phases existing over different tempering temperatures. The correlation between the mechanical properties and microstracture was established, and the precipitation mechanisms of carbides at the different tempering temperatures are explained.
机译：研究了Nb-V-Ti微合金化超高强度钢在不同回火温度下的组织，析出物和力学性能。随着回火温度的升高，马氏体板条的宽度逐渐增加，其中位错减少，残余奥氏体的体积分数先增大然后减小。此外，在牺牲强度的情况下，夏比冲击韧性，面积减小和伸长率提高。在不同的回火温度下鉴定出四种析出物，即M_3C，M_2C，M_（23）C_6和M_7C_3。 M_3C在200-400℃回火时析出，当温度升至500℃时，一部分被M_2C取代，此时M_（23）C_6也析出。在600℃以上的高温下，M_3C消失，一些M_2C转变成M_7C_3。发现另外两种类型的MC沉淀物是在不同回火温度下存在的稳定相。建立了力学性能与显微组织之间的关系，并解释了不同回火温度下碳化物的析出机理。

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  • 来源
    《Materials Science and Engineering》 |2017年第23期|215-226|共12页
  • 作者

    Ji Dong; Xiaosheng Zhou; Yongchang Liu; Chong Li; Chenxi Liu; Qianying Guo;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, PR China;

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  • 正文语种 eng
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  • 关键词

    Nb-V-Ti microalloyed ultra-high strength steel; Tempering; Microstructure; Precipitates; Mechanical properties;

    机译：Nb-V-Ti微合金超高强度钢;回火微观结构沉淀物;机械性能;

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