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<p>Laser metal deposition (LMD) is an advanced additive manufacturing technique that offers exceptional flexibility in material design and processing. In this study, defect-minimized (near-pore-free and crack-free) MS/H13 steel composites with varying compositions were fabricated <i>via</i> LMD at a laser power of 1350 W and a scanning speed of 5&#xa0;mm/s. Comprehensive microstructural characterization and mechanical property evaluations were conducted. The composites predominantly comprised martensite, retained austenite, and trace amounts of carbides and intermetallic compounds. Notably, at 50 wt pct H13 content, pronounced carbide precipitation and aggregation were observed in the matrix. The incorporation of H13 significantly enhanced hardness (from 312 to 558 HV) and wear resistance (from 9.03 × 10<sup>−6</sup> to 2.75 × 10<sup>−6</sup> mm<sup>3</sup>/N&#xa0;m), while the ultimate tensile strength increased from 1162 to 1880.1&#xa0;MPa. However, elongation decreased from 8.2 to 5.5 pct. Furthermore, the formation of a dense Cr-rich oxide layer improved corrosion resistance, with the 75 wt pct MS + 25 wt pct H13 and 50 wt pct MS + 50 wt pct H13 composites exhibiting notably low corrosion currents of 3.479 and 3.576 <i>μ</i>A/cm<sup>2</sup>, respectively. This work demonstrates a novel concentration-modulated <i>in situ</i> alloying strategy to achieve well-balanced mechanical properties, making the composites suitable for both structural and functional applications.</p> Graphical Abstract <p></p>

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Microstructure and Mechanical Properties of MS/H13 Steel Composites Fabricated by Laser Metal Deposition

  • 期刊论文

  • 发表日期：

    2026年4月5日

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  • Min Zhang,
  • Changjun Chen,
  • Haodong Liu

摘要

Laser metal deposition (LMD) is an advanced additive manufacturing technique that offers exceptional flexibility in material design and processing. In this study, defect-minimized (near-pore-free and crack-free) MS/H13 steel composites with varying compositions were fabricated via LMD at a laser power of 1350 W and a scanning speed of 5 mm/s. Comprehensive microstructural characterization and mechanical property evaluations were conducted. The composites predominantly comprised martensite, retained austenite, and trace amounts of carbides and intermetallic compounds. Notably, at 50 wt pct H13 content, pronounced carbide precipitation and aggregation were observed in the matrix. The incorporation of H13 significantly enhanced hardness (from 312 to 558 HV) and wear resistance (from 9.03 × 10−6 to 2.75 × 10−6 mm3/N m), while the ultimate tensile strength increased from 1162 to 1880.1 MPa. However, elongation decreased from 8.2 to 5.5 pct. Furthermore, the formation of a dense Cr-rich oxide layer improved corrosion resistance, with the 75 wt pct MS + 25 wt pct H13 and 50 wt pct MS + 50 wt pct H13 composites exhibiting notably low corrosion currents of 3.479 and 3.576 μA/cm2, respectively. This work demonstrates a novel concentration-modulated in situ alloying strategy to achieve well-balanced mechanical properties, making the composites suitable for both structural and functional applications.

Graphical Abstract