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Microstructure and mechanical properties of TiN particles strengthened 316L steel prepared by laser melting deposition process

机译：锡颗粒的组织和力学性能强化激光熔化沉积工艺制备的316L钢

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摘要

Large columnar grains of 316L stainless steel prepared by laser melting deposition (LMD) additive manufacturing process lead to low yield strength and anisotropic mechanical properties, therefore limit its usage. In this study, different contents of nanoscale TiN particles (0 wt%, 2 wt%, 4 wt% and 6 wt%) have been added into the LMD process of 316L steel to promote heterogeneous nucleations of grains, and to improve the strength. The results show that the TiN particles additions can refine the grain sizes significantly, and prompt columnar to equiaxed transitions of grains. The grain sizes can be refined more than 20 times after adding 2 wt% TiN particles. The strength of the 316L-based composites increases with the increase of TiN addition, however, at the expense of ductility. With 2 wt% TiN particle addition, the 316L-based composite can have balanced mechanical properties with high yield strength of 323-355 MPa, high tensile strength of 629-640 MPa, and good elongations of 26-30%. The strength improvements are quantitatively analyzed considering the Hall-Petch strengthening, Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening. The calculations agree well with the experimental values, and reveal that the grain refinement strengthening is the main strengthening mechanism. The present study provides an important basis for fabricating high strength 316L-based composites using the LMD process.
机译：通过激光熔化沉积（LMD）添加剂制造工艺制备的316L不锈钢的大柱状晶粒导致低屈服强度和各向异性机械性能，因此限制了其使用。在该研究中，已加入到316L钢的LMD方法中的不同含量（0wt％，2重量％，4wt％和6wt％），以促进谷物的异质核化合物，提高强度。结果表明，锡颗粒添加可以显着细化晶粒尺寸，并提示柱状颗粒的平衡过渡。在加入2wt％的锡颗粒后，晶粒尺寸可以在20多次以上。然而，316L基复合材料的强度随着锡的增加而增加，延展性的增加。用2wt％锡颗粒添加，316L基复合材料可具有平衡的机械性能，高屈服强度为323-355MPa，高抗拉强度为629-640MPa，良好的伸长率为26-30％。考虑到霍尔 - 铺设强化，砧座强化，热失配强化和负载转移强化，定量分析了强度的改进。该计算与实验值吻合良好，并揭示了晶粒细化强化是主要的加强机制。本研究提供了使用LMD工艺制造高强度316L基复合材料的重要依据。

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  • 来源
    《Materials Science and Engineering》 |2021年第13期|141220.1-141220.8|共8页
  • 作者

    Ye Wang; Zhenghao Liu; Yuzhao Zhou; Xiaoshan Yang; Jingang Tang; Xue Liu; Jinfeng Li; Guomin Le;

  • 作者单位

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Machinery Manufacturing Technology China Academy of Engineering Physics Mianyang 621900 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

    Institute of Materials China Academy of Engineering Physics Mianyang 621908 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser additive manufacturing; 316L steel; TiN particles; Microstructure; Mechanical properties;

    机译：激光添加剂制造;316L钢;锡颗粒;微观结构;机械性能;

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