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CHAO Xiangrui, HUANG Yong, CHEN Zipeng, XU Xuehu, LI Wenjian, WANG Ning, ZHANG Zhihu. Effect of laser remelting on microstructure and properties of In718 cladding layer[J]. LASER TECHNOLOGY, 2023, 47(4): 506-512. DOI: 10.7510/jgjs.issn.1001-3806.2023.04.010
Citation: CHAO Xiangrui, HUANG Yong, CHEN Zipeng, XU Xuehu, LI Wenjian, WANG Ning, ZHANG Zhihu. Effect of laser remelting on microstructure and properties of In718 cladding layer[J]. LASER TECHNOLOGY, 2023, 47(4): 506-512. DOI: 10.7510/jgjs.issn.1001-3806.2023.04.010
shu

Effect of laser remelting on microstructure and properties of In718 cladding layer

  • 1.

    School of Mechanical and Electrical Engineering, Xinjiang Agricultural University, Urumqi 830052, China

  • 2.

    School of Mechanical and Electrical Engineering, Xinjiang Institute of Engineering, Urumqi 830023, China

  • 3.

    Ductile Iron Pipes Fukang Energy Co. Ltd., Changji 831500, China

  • 4.

    Xinjiang Huixiang Laser Technology Co. Ltd., Karamay 833699, China

  • 5.

    Research Center of Laser Intelligent Manufacturing and Remanufacturing Engineering Technology, Xinjiang Institute of Engineering, Urumqi 830023, China

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  • Received Date: May 25, 2022
  • Revised Date: July 05, 2022
  • Published Date: July 24, 2023
    Graphical Abstract
    • Abstract
  • In order to solve the problem of poor mechanical properties of laser cladding In718 alloy, different scanning speeds were selected to carry out laser remelting treatment of the cladding layer. Optical microscope, scanning electron microscope and energy dispersive spectrometer were used to observe the microstructure and characteristics and to detect the composition of different phases. The influence of microsegregation on the microstructure was then analyzed. The microhardness and tensile strength of the coating were tested by mechanical testing equipment. The results show that the Laves phase is mainly caused by the segregation of Nb and Mo elements. Compared with the non-remelted coating, the pores of the remelted coating are significantly reduced, and different remelting scanning speeds have different effects on the structure and properties. The Laves phase volume fraction of four coatings respectively decreased from 34.1% to 24.6%, 16.7%, and 19.6%, the average hardness respectively increased from 250.3 HV to 261.5 HV, 276.9 HV, and 268.0 HV. The tensile strength respectively increased from 678 MPa to 728 MPa, 879 MPa, and 808 MPa. However, the effect of remelted coating on elongation is not obvious. The optimum remelting scanning speed is 15 mm/s, which has the lowest Laves phase content and the highest average microhardness and tensile strength. Laser remelting can effectively improve the morphology of the cladding layer, reduce the porosity, reduce or inhibit the precipitation of Laves phase. Reducing the Laves phase to improve the mechanical properties of In718 alloy. This research establishes a theoretical foundation for the subsequent remanufacturing of centrifugal cast ductile iron pipes molds.
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    • References (22)
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