磁场辅助激光熔覆Inconel 718合金的热力学成形机制与组织性能研究
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河南科技职业大学机电工程学院,周口 453003

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TG17

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Thermodynamic Forming Mechanism and Microstructure Properties of Inconel 718 Alloy by Magnetic Field Assisted Laser Cladding
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College of Mechanical and Electrical Engineering,Henan Vocational University of Science and Technology,Zhoukou 453003

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    摘要:

    本文旨在研究不同强度稳恒磁场对激光熔覆Inconel 718高温合金的影响。通过在4种不同强度(0、100、300、500 mT)的稳恒磁场下进行激光熔覆实验,采用数值仿真与典型实验相结合的手段对熔覆层的表面形貌、匙孔模式温度场变化、组织与力学性能进行了研究。结果表明:当B=300 mT时,材料的熔化和蒸发潜热屏障受到明显抑制,匙孔固-液界面之间的形貌最为均匀,且得到的熔覆层表面形貌最佳,平均表面粗糙度Ra约为4.1 μm;显微组织主要由等轴晶组成,平均晶粒尺寸约为5.1 μm;虽然硬度变化程度不大,但是可以使得熔覆层的平均抗拉强度提高到1.122 GPa,平均延伸率达到29.9%。研究表明,适当强度的稳恒磁场可以显著改善Inconel 718激光熔覆层的综合性能,为磁控激光熔覆技术在相关工业领域的应用提供了理论依据与实验数据支持。

    Abstract:

    This study aimed to investigated the effects of steady magnetic fields with different intensities on laser cladding of Inconel 718 superalloy. Laser cladding experiments were conducted under four different magnetic field strengths (0,100,300,500 mT), and numerical simulation combined with typical experiments was used to study the surface morphology, keyhole mode temperature field changes, microstructure, and mechanical properties of the cladding layer. The results show that when B=300 mT, the melting and evaporation latent heat barrier of the material is significantly suppressed, the morphology between the keyhole solid-liquid interface is most uniform, and the surface morphology of the cladding layer is optimal, with an average surface roughness Ra of about 4.1 μm. The microstructure is mainly composed of equiaxed grains with an average grain size of about 5.1 μm. Although the change in hardness is not significant, the average tensile strength of the cladding layer can be increased to 1.122 GPa, with an average elongation of 29.9%. The study demonstrates that a steady magnetic field of appropriate strength can significantly improve the comprehensive performance of the Inconel 718 laser cladding layer, providing theoretical basis and experimental data support for the application of magnetic-controlled laser cladding technology in related industrial fields.

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马莉冰,陈文涛,桑文雅.磁场辅助激光熔覆Inconel 718合金的热力学成形机制与组织性能研究[J].宇航材料工艺,2024,54(5):75-80.

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  • 收稿日期:2022-03-22
  • 最后修改日期:2022-07-26
  • 录用日期:2022-07-27
  • 在线发布日期: 2024-12-03
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