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<p>To overcome some inherent limitations of conventional fabrication methods, TIG PBF-AAM technique has been explored to fabricate B<sub>4</sub>C-AISI434L steel MMC thin wall structures with enhanced mechanical properties. The effect of substrate material (AISI 1020 and AISI 304 steel) and the B<sub>4</sub>C content on the geometrical characteristics, microstructure, microhardness and wear resistance of the fabricated parts have been analyzed. Owing to discrepancies in thermo-mechanical properties, a tendency of departure of the deposited structure was witnessed for using AISI 1020 steel substrate. A prominent microstructural variation along the building direction was observed for the alteration of substrate material. The presence of unreacted B<sub>4</sub>C, iron borides and B<sub>0.44</sub>C<sub>1.41</sub>Cr<sub>3</sub> phases improved the microhardness value of the fabricated composite part up to 480% and exhibited 93% lower wear loss (24&#xa0;µm) as compared to pure AISI 434L part (350&#xa0;µm) produced by similar technique. Nevertheless, its corrosion resistance deteriorates from 0.044 to 0.23&#xa0;mm/yr. The B<sub>4</sub>C-AISI434L steel composite structure yielded on AISI 304 steel exhibited up to 13% improved microhardness, and 35% lower wear loss as compared to the part fabricated on AISI 1020 steel. This study demonstrated the potential of TIG PBF-AAM method to fabricate ceramic particle-reinforced MMC parts with outstanding wear-resistant properties, effective for tribological applications.</p>

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Influence of Substrate Material and B4C Content on the Properties of B4C-434L Steel Composite Part Fabricated by TIG-Aided Powder Bed Fusion Arc Additive Manufacturing (TIG PBF-AAM) Technique

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • M. D. Aseef Khan,
  • Manoj Masanta

摘要

To overcome some inherent limitations of conventional fabrication methods, TIG PBF-AAM technique has been explored to fabricate B4C-AISI434L steel MMC thin wall structures with enhanced mechanical properties. The effect of substrate material (AISI 1020 and AISI 304 steel) and the B4C content on the geometrical characteristics, microstructure, microhardness and wear resistance of the fabricated parts have been analyzed. Owing to discrepancies in thermo-mechanical properties, a tendency of departure of the deposited structure was witnessed for using AISI 1020 steel substrate. A prominent microstructural variation along the building direction was observed for the alteration of substrate material. The presence of unreacted B4C, iron borides and B0.44C1.41Cr3 phases improved the microhardness value of the fabricated composite part up to 480% and exhibited 93% lower wear loss (24 µm) as compared to pure AISI 434L part (350 µm) produced by similar technique. Nevertheless, its corrosion resistance deteriorates from 0.044 to 0.23 mm/yr. The B4C-AISI434L steel composite structure yielded on AISI 304 steel exhibited up to 13% improved microhardness, and 35% lower wear loss as compared to the part fabricated on AISI 1020 steel. This study demonstrated the potential of TIG PBF-AAM method to fabricate ceramic particle-reinforced MMC parts with outstanding wear-resistant properties, effective for tribological applications.