Liquefaction Characteristics and Cracking Behavior of the Grain Boundaries and Interdendritic Regions in Non-Weldable K447A Superalloy During Laser Re-Melting

Wei, Qi; Du, Shangzhe; Nie, Pulin; Yao, Chengwu; Huang, Jian

doi:10.1007/s11661-024-07484-8

Metall Mater Trans A

2024

DOI: 10.1007/s11661-024-07484-8

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Liquefaction Characteristics and Cracking Behavior of the Grain Boundaries and Interdendritic Regions in Non-Weldable K447A Superalloy During Laser Re-Melting

Qi Wei,

Shangzhe Du,

Pulin Nie

et al.

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Cited by 3 publications

References 35 publications

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Effect of laser/ultrasonic shock peening on the microstructure and mechanical properties of nickel-based superalloys prepared by Powder Bed Fusion Laser Beam (PBF-LB)

Chen,

Xie,

et al. 2024

Journal of Materials Research and Technology

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Effect of laser/ultrasonic shock peening on the microstructure and mechanical properties of nickel-based superalloys prepared by Powder Bed Fusion Laser Beam (PBF-LB)

Chen,

Xie,

et al. 2024

Journal of Materials Research and Technology

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The suppression of liquation cracking in the repair process of non-weldable K447A superalloys by laser surface remelting-assisted laser cladding

Wei,

Ye,

et al. 2025

Surface and Coatings Technology

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Multiple Preheating Processes for Suppressing Liquefaction Cracks in IN738LC Superalloy Fabricated by Electron Beam Powder Bed Fusion (EB-PBF)

Li,

Long,

Wei

et al. 2024

Materials

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In additive manufacturing, controlling hot cracking in non-weldable nickel-based superalloys poses a significant challenge for forming complex components. This study introduces a multiple preheating process for the forming surface in electron beam powder bed fusion (EB-PBF), employing a dual-band infrared surface temperature measurement technique instead of the conventional base plate thermocouple method. This new approach reduces the temperature drop during forming, decreasing surface cooling by 28.6% compared to traditional methods. Additionally, the precipitation of carbides and borides is reduced by 38.5% and 80.1%, respectively, lowering the sensitivity to liquefaction cracking. This technique enables crack-free forming at a lower powder bed preheating temperature (1000 °C), thereby improving the powder recycling rate by minimizing powder sintering. Microstructural analysis confirms that this method reduces low-melting eutectic formation and alleviates liquefaction cracking at high-angle grain boundaries caused by thermal cycling. Consequently, crack-free IN738 specimens with high-temperature durability were successfully achieved, providing a promising approach for the EB-PBF fabrication of crack-resistant IN738 components.

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Liquefaction Characteristics and Cracking Behavior of the Grain Boundaries and Interdendritic Regions in Non-Weldable K447A Superalloy During Laser Re-Melting

Cited by 3 publications

References 35 publications

Effect of laser/ultrasonic shock peening on the microstructure and mechanical properties of nickel-based superalloys prepared by Powder Bed Fusion Laser Beam (PBF-LB)

Effect of laser/ultrasonic shock peening on the microstructure and mechanical properties of nickel-based superalloys prepared by Powder Bed Fusion Laser Beam (PBF-LB)

The suppression of liquation cracking in the repair process of non-weldable K447A superalloys by laser surface remelting-assisted laser cladding

Multiple Preheating Processes for Suppressing Liquefaction Cracks in IN738LC Superalloy Fabricated by Electron Beam Powder Bed Fusion (EB-PBF)

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