Abstract Microstructural evolution, coarsening behavior of precipitates and mechanical properties of boron bearing steel 25CrMoNbB during tempering
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Microstructural evolution, coarsening behavior of precipitates and mechanical properties of boron bearing steel 25CrMoNbB during tempering

机译：25CrMoNbB钢在回火过程中的组织演变，析出物的粗化行为和力学性能

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AbstractIn order to optimize the tempering process of boron bearing steel 25CrMoNbB, the effect of tempering temperature and holding time on martensitic microstructure, precipitation and mechanical properties has been studied. Thermo-Calc software was used to carry out thermodynamic calculation of the equilibrium precipitation. The precipitates growth behaviors were simulated using the program package diffusion-controlled transformations (DICTRA). Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAD) and energy dispersive spectrometer (EDS) were used to analyze microstructure and precipitates. B distribution was observed by secondary ion mass spectroscopy (SIMS). Electron back-scattered diffraction (EBSD) and TEM were used to analyze the martensitic microstructure evolution during tempering. The results showed that the B-bearing precipitates had a significant effect on the impact toughness and little effect on the tensile strength. The B atoms segregating at prior austenite grain boundaries (PAG) during austenitizing process promoted precipitation of M2B during tempering. The M2B precipitates mainly contained Fe, Mo, Cr and B elements and significantly reduced the toughness. Therefore, B content in 25CrMoNbB steel should be controlled below 20ppm. In addition, the tempering temperature and holding time should also be optimized to reduce the detrimental effect of M2B on the impact toughness. In as-tempered condition, besides M2B precipitates, M23C6, M7C3, and MC carbides were identified. M7C3and MC carbides tended to precipitate in the matrix, whereas M23C6tended to precipitate at PAG and sub-grain boundaries. Although carbides were coarsening with increasing tempering temperature or holding time, the coarsening of martensitic blocks and laths has reduced their detrimental effect on the toughness.
机译： 摘要 为优化含硼25CrMoNbB钢的回火工艺，研究了回火温度和保温时间对马氏体组织，析出和力学性能的影响。使用Thermo-Calc软件进行平衡沉淀的热力学计算。使用程序包扩散控制的转换（DICTRA）模拟沉淀物的生长行为。使用场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），选择区域电子衍射（SAD）和能量分散光谱仪（EDS）来分析微观结构和沉淀。通过二次离子质谱法（SIMS）观察到B分布。电子背散射衍射（EBSD）和TEM用于分析回火过程中的马氏体微观组织演变。结果表明，含B的沉淀物对冲击韧性有显着影响，而对拉伸强度的影响很小。在奥氏体化过程中，先质奥氏体晶界处的B原子偏析促进了回火过程中M 2 B的析出。 M 2 B沉淀物主要包含Fe，Mo，Cr和B元素，并显着降低了韧性。因此，应将25CrMoNbB钢中的B含量控制在20ppm以下。此外，还应优化回火温度和保温时间，以减少M 2 B对冲击韧性的不利影响。在回火条件下，除了M 2 B析出，M 23 C 6 ，M 7 C 3 ，并且鉴定出MC碳化物。 M 7 C 3 ，MC碳化物倾向于在基体中沉淀，而M 23 C 6 倾向于在PAG和子晶粒边界处沉淀。尽管碳化物随着回火温度或保温时间的增加而粗化，但马氏体块体和板条的粗化降低了其对韧性的不利影响。

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  • 来源
    《Materials Science and Engineering》 |2018年第17期|453-465|共13页
  • 作者

    Yaxu Zheng; Fuming Wang; Changrong Li; Yongliang Li; Jin Cheng;

  • 作者单位

    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing;

    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing;

    School of Materials Science and Engineering, University of Science and Technology Beijing;

    School of Materials Science and Engineering, University of Science and Technology Beijing,Shougang Jingtang United Iron & Steel Co., Ltd;

    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing;

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  • 正文语种 eng
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  • 关键词

    Tempering; Microstructural evolution; Boron bearing steel; Toughness; Precipitation;

    机译：回火;组织演变;含硼钢;韧性;析出;

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