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<p>Poor wear resistance of additively manufactured (AMed) Inconel 718 components remains a key constraint on their widespread deployment in engineering applications. Adding reinforcement particles into the Inconel 718 matrix represents a promising approach to address this challenge. To this end, this work investigates the effects of titanium carbide (TiC) particle addition on the microstructural evolution and wear performance of Inconel 718 fabricated via selective arc melting (SAM). Inconel 718 and TiC/Inconel 718 composite thin-walled parts were fabricated using the SAM method, followed by systematic characterization of their as-built microstructures, hardness, and wear behavior. The findings demonstrate that TiC addition significantly inhibits Laves phase formation, attributed to its dual function: promoting the precipitation of Nb- and Mo-rich carbides and enhancing the cooling rate of the interdendritic liquid phase. Compared to the Inconel 718 part, the TiC/Inconel 718 composite part exhibits a hardness increase of up to 28.4% and a remarkable 142.8% improvement in wear resistance. The enhanced hardness is primarily ascribed to the dispersion of carbide phases within the matrix, while the formation of a dense, high-hardness oxide layer on the worn surface effectively mitigates material loss, thereby contributing to the superior wear resistance. This work offers valuable insights for optimizing the performance of AMed Inconel 718 components, facilitating their broader application in demanding engineering scenarios.</p>

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Effect of TiC particles on the microstructure formation and wear performance of Inconel 718 fabricated by selective arc melting

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Weiran Xie,
  • Xiaoming Duan,
  • Xiaodong Yang

摘要

Poor wear resistance of additively manufactured (AMed) Inconel 718 components remains a key constraint on their widespread deployment in engineering applications. Adding reinforcement particles into the Inconel 718 matrix represents a promising approach to address this challenge. To this end, this work investigates the effects of titanium carbide (TiC) particle addition on the microstructural evolution and wear performance of Inconel 718 fabricated via selective arc melting (SAM). Inconel 718 and TiC/Inconel 718 composite thin-walled parts were fabricated using the SAM method, followed by systematic characterization of their as-built microstructures, hardness, and wear behavior. The findings demonstrate that TiC addition significantly inhibits Laves phase formation, attributed to its dual function: promoting the precipitation of Nb- and Mo-rich carbides and enhancing the cooling rate of the interdendritic liquid phase. Compared to the Inconel 718 part, the TiC/Inconel 718 composite part exhibits a hardness increase of up to 28.4% and a remarkable 142.8% improvement in wear resistance. The enhanced hardness is primarily ascribed to the dispersion of carbide phases within the matrix, while the formation of a dense, high-hardness oxide layer on the worn surface effectively mitigates material loss, thereby contributing to the superior wear resistance. This work offers valuable insights for optimizing the performance of AMed Inconel 718 components, facilitating their broader application in demanding engineering scenarios.