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首页> 外文期刊>Journal of Materials Engineering and Performance >Formation and Elimination Mechanism of Lack of Fusion and Cracks in Direct Laser Deposition 24CrNiMoY Alloy Steel
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Formation and Elimination Mechanism of Lack of Fusion and Cracks in Direct Laser Deposition 24CrNiMoY Alloy Steel

机译：直接激光沉积24crnimoy合金钢缺乏融合和裂缝的形成与消除机制

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摘要

The defects of lack of fusion (LOF) and cracks produced in the process of direct laser deposition 24CrNiMoY alloy steel have a great influence on the mechanical properties of samples. The effects of laser energy area density (EAD) on the distribution and formation mechanism of the LOF and cracks are studied by TEM, EBSD, SEM, OM, laser confocal microscopy (LCM) and macroscopic stereo microscope (MSM). The results show that different EADs have an important influence on the formation and elimination of defects in direct laser deposition 24CrNiMoY alloy steel sample. When the EAD is 67 J/mm(2), the wettability is adverse, the molten pool parameters do not satisfy the complete fusion formula, and the LOF defects occur in the samples. However, as the number of deposition layers increases, the proportion of LOF defects decrease. When the EAD is increased to 78 J/mm(2), thermal stress causes the liquid film to rupture and inclusion cracking, and cracks appear in the sample. However, when the EAD is 72 J/mm(2), due to good liquid flow in the molten pool, the solid-liquid phase wettability is increased and elemental segregation is weakened. Meanwhile, the thermal stress in the sample is moderate. Therefore, the sample without LOF defects and cracks is prepared, and the sample has the best microhardness (386 HV) and tensile properties (ultimate tensile strength is 788 MPa; elongation is 9.1%), which lays a foundation for the preparation of defect-free 24CrNiMoY alloy steel samples by direct laser deposition.
机译：激光直接沉积24CrNiMoY合金钢过程中产生的未熔合缺陷和裂纹对试样的力学性能有很大影响。采用透射电镜、电子背散射、扫描电镜、光学显微镜、激光共聚焦显微镜（LCM）和宏观立体显微镜（MSM）研究了激光能量面密度（EAD）对LOF和裂纹分布和形成机理的影响。结果表明，不同的EAD对激光直接沉积24CrNiMoY合金钢试样中缺陷的形成和消除有重要影响。当EAD为67J/mm（2）时，润湿性不利，熔池参数不满足完全熔合公式，样品中出现LOF缺陷。然而，随着沉积层数量的增加，LOF缺陷的比例降低。当EAD增加到78 J/mm（2）时，热应力导致液膜破裂和夹杂物开裂，样品中出现裂纹。然而，当EAD为72 J/mm（2）时，由于熔池中良好的液体流动，固-液相润湿性增加，元素偏析减弱。同时，样品中的热应力适中。因此，制备了没有LOS缺陷和裂纹的样品，样品具有最佳的显微硬度（386 HV）和拉伸性能（极限拉伸强度为788 MPa，伸长率为9.1%），这为直接激光沉积制备无缺陷24CnMnIIO合金钢奠定了基础。

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  • 作者

    Guo Qian; Chen Suiyuan; Wei Mingwei; Liang Jing; Liu Changsheng; Wang Mei;

  • 作者单位

    Northeastern Univ Sch Mat &

    Engn Key Lab Anisotropy &

    Texture Mat Minist Educ Key Lab Laser Applicat Technol &

    Equi Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Sch Mat &

    Engn Key Lab Anisotropy &

    Texture Mat Minist Educ Key Lab Laser Applicat Technol &

    Equi Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Sch Mat &

    Engn Key Lab Anisotropy &

    Texture Mat Minist Educ Key Lab Laser Applicat Technol &

    Equi Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Sch Mat &

    Engn Key Lab Anisotropy &

    Texture Mat Minist Educ Key Lab Laser Applicat Technol &

    Equi Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Sch Mat &

    Engn Key Lab Anisotropy &

    Texture Mat Minist Educ Key Lab Laser Applicat Technol &

    Equi Shenyang 110819 Liaoning Peoples R China;

    Shenyang Dalu Laser Technol Co Ltd Shenyang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 金属学与金属工艺;工程材料学;
  • 关键词

    24CrNiMoY alloy steel; cracks; direct laser deposition (DLD); energy density; formation mechanism; lack of fusion (LOF);

    机译：24CrNiMoY合金钢;裂缝;直接激光沉积（DLD）;能量密度;形成机制;缺乏融合（LOF）;

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