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<p>Selective laser melting technique (SLM) has emerged as a key in additive manufacturing for producing high-strength metallic components with complex geometries for engineering sectors such as aerospace, defence, and tooling. Optimizing SLM processing parameters is essential to achieving the microstructural integrity and functional performance required in these applications. The present study investigates the morphology of maraging steel powder prior to the additive manufacturing process using SEM analysis, revealing particle sizes in the range of approximately 10-30&#xa0;µm. Additively manufactured 18Ni300 maraging steel alloys (MS-300 I, MS-300 II, and MS-300 III) were subsequently evaluated for hardness by varying the hatch distance, while maintaining a constant laser power of 370&#xa0;W and 200&#xa0;mm/s as scan speed. The results indicate that hardness decreased with increasing hatch distance. Moreover, the influence of hatch distance on relative density was systematically investigated, revealing a strong dependence of densification on hatch spacing. Hatch distance with 0.1&#xa0;mm, resulted in the highest relative density of 95.64%, indicating that an optimal energy density is critical for maximizing material densification. Furthermore, the corrosion behavior of maraging steel in 0.5&#xa0;M sulfamic acid was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy, using EMTS that demonstrated strong adsorption and improved corrosion resistance. At 298&#xa0;K, MS-300 I exhibited the highest inhibition efficiency (56.37% at 0.6&#xa0;mg/L). These findings underscore the critical role of hatch distance in tailoring the structural integrity and environmental durability of SLM maraging steels, offering insights relevant to high-performance applications in material science and aerospace engineering.</p>

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Corrosion Resistance Investigation on Laser-Sintered Maraging Steel (18Ni300): An Evaluation of Hardness and Electrochemical Studies

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • S. Smitha Shree,
  • T. Mahantesh,
  • Srilatha Rao,
  • A. Shailesh Rao,
  • A. Arathi,
  • G. K. Prashanth,
  • K. Asha

摘要

Selective laser melting technique (SLM) has emerged as a key in additive manufacturing for producing high-strength metallic components with complex geometries for engineering sectors such as aerospace, defence, and tooling. Optimizing SLM processing parameters is essential to achieving the microstructural integrity and functional performance required in these applications. The present study investigates the morphology of maraging steel powder prior to the additive manufacturing process using SEM analysis, revealing particle sizes in the range of approximately 10-30 µm. Additively manufactured 18Ni300 maraging steel alloys (MS-300 I, MS-300 II, and MS-300 III) were subsequently evaluated for hardness by varying the hatch distance, while maintaining a constant laser power of 370 W and 200 mm/s as scan speed. The results indicate that hardness decreased with increasing hatch distance. Moreover, the influence of hatch distance on relative density was systematically investigated, revealing a strong dependence of densification on hatch spacing. Hatch distance with 0.1 mm, resulted in the highest relative density of 95.64%, indicating that an optimal energy density is critical for maximizing material densification. Furthermore, the corrosion behavior of maraging steel in 0.5 M sulfamic acid was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy, using EMTS that demonstrated strong adsorption and improved corrosion resistance. At 298 K, MS-300 I exhibited the highest inhibition efficiency (56.37% at 0.6 mg/L). These findings underscore the critical role of hatch distance in tailoring the structural integrity and environmental durability of SLM maraging steels, offering insights relevant to high-performance applications in material science and aerospace engineering.