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This study investigates the impact of incorporating sub-micron TiC particles on microstructural characteristics, and mechanical properties of laser powder bed fusion (LPBF)-fabricated CX stainless steel (SS) components. The findings revealed that TiC addition increased the density of as-printed parts compared to non-reinforced CX SS under similar processing conditions. Microstructural analysis revealed the formation of in-situ nano-sized TiC particles alongside initial submicron particles, with higher laser energy density resulting in a greater fraction of nano-sized TiC particles. Furthermore, the inclusion of TiC particles induced significant grain refinement and disruption of columnar structure. Notably, the introduction of 2 wt.% TiC showcased superior grain refinement and yielded the highest hardness.

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Effect of TiC Addition on Microstructure and Mechanical Properties of CX Stainless Steel Produced via Laser Powder Bed Fusion

  • 会议论文

  • 发表日期：

    2025年

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  • Elham Afshari,
  • Donald Paul Bishop,
  • Ali Nasiri

摘要

This study investigates the impact of incorporating sub-micron TiC particles on microstructural characteristics, and mechanical properties of laser powder bed fusion (LPBF)-fabricated CX stainless steel (SS) components. The findings revealed that TiC addition increased the density of as-printed parts compared to non-reinforced CX SS under similar processing conditions. Microstructural analysis revealed the formation of in-situ nano-sized TiC particles alongside initial submicron particles, with higher laser energy density resulting in a greater fraction of nano-sized TiC particles. Furthermore, the inclusion of TiC particles induced significant grain refinement and disruption of columnar structure. Notably, the introduction of 2 wt.% TiC showcased superior grain refinement and yielded the highest hardness.