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首页> 外文期刊>Materials Science and Engineering >Microstructural and mechanical properties development during quenching-partitioning-tempering process of Nb-V-Ti microalloyed ultra-high strength steel
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Microstructural and mechanical properties development during quenching-partitioning-tempering process of Nb-V-Ti microalloyed ultra-high strength steel

机译：Nb-V-Ti微合金超高强度钢淬火-回火-回火过程中的组织和力学性能发展

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摘要

The applicability of quenching-partitioning-tempering (Q-P-T) treatment to the Nb-V-Ti microalloyed ultra-high strength steel has been investigated by SEM, TEM, XRD examination and mechanical tests. After Q-P process, lath martensite and retained austenite were obtained. Three kinds of carbides have been identified, namely Ti-rich MC, Nb-rich MC and M_3C. In addition to tempered martensite and retained austenite, M_2C, M_7C_3 and M_(23)C_6 particles were formed after Q-P-T treatment. Two types of MC carbides were found to be the stable phases existing during tempering process. In both of the specimens after Q-P and tempering process, the width of lath martensite and the volume fraction of retained austenite increased with increase in partitioning temperature. After tempering process, a variation of mechanical properties was found when the partitioning temperature varies from 320 ℃ to 440 ℃. The strength first decreased and then increased, impact toughness increased gradually with increase in partitioning temperature. There were no significant changes in reduction of area and elongation. The reduction of area was about 60% and elongation was around 20%.
机译：通过SEM，TEM，XRD和力学性能测试研究了淬火-回火-回火（Q-P-T）处理对Nb-V-Ti微合金超高强度钢的适用性。经过Q-P处理后，获得了板条马氏体和残余奥氏体。已经确定了三种碳化物，即富Ti的MC，富Nb的MC和M_3C。在Q-P-T处理后，除了回火的马氏体和残留的奥氏体，还形成了M_2C，M_7C_3和M_（23）C_6颗粒。发现两种类型的MC碳化物是回火过程中存在的稳定相。在Q-P和回火处理后的两个试样中，板条状马氏体的宽度和残余奥氏体的体积分数均随着分配温度的升高而增加。在回火过程中，分配温度在320℃至440℃之间变化时，发现机械性能发生变化。随着分配温度的升高，强度先降低后升高，冲击韧性逐渐提高。面积减小和伸长率没有明显变化。面积减小约60％，伸长率约20％。

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  • 来源
    《Materials Science and Engineering》 |2017年第29期|249-256|共8页
  • 作者

    Ji Dong; Chong Li; Chenxi Liu; Yuan Huang; Liming Yu; Huijun Li; Yongchang Liu;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, PR China,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, 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; Quenching partitioning tempering treatment; Different partitioning temperature; Multi-phase microstructure; Mechanical properties;

    机译：Nb-V-Ti微合金超高强度钢;淬火分区回火处理;不同的分配温度;多相微结构;机械性能;

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