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<p>Maraging steel is extensively utilized in industrial applications owing to its superior mechanical properties, including high strength, toughness, and dimensional stability. This study evaluates the feasibility of gas tungsten arc welding (GTAW) for repairing maraging steel components fabricated via laser-powder bed fusion (L-PBF). Specimens (100 × 50 × 2&#xa0;mm) were produced in three build orientations (0°, 45°, and 90°) using maraging steel powder, followed by solution treatment and age hardening. Autogenous GTAW was employed to join both additively manufactured (AM) and conventionally processed samples. Microstructural and mechanical properties of the weldments were analyzed through optical and scanning electron microscopy, microhardness, and tensile testing. Results indicate orientation-dependent hardness in AM samples: 45° samples exhibited 16% lower, while 90° samples showed 4% higher hardness compared to conventional counterparts. Additionally, the ultimate tensile strength of 90° AM samples was 5% higher than that of conventional weldments. The findings demonstrate the potential of GTAW as a cost-effective repair strategy for L-PBF-fabricated maraging steel (grade 300) components.</p>

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Microstructure Evaluation and Mechanical Properties of 3D-Printed Maraging Steel-300 Samples: Joined by GTAW Process

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Manoj Kumar,
  • Santosh Kumar,
  • Pankaj Kumar Singh,
  • Bipin Kumar Srivastava

摘要

Maraging steel is extensively utilized in industrial applications owing to its superior mechanical properties, including high strength, toughness, and dimensional stability. This study evaluates the feasibility of gas tungsten arc welding (GTAW) for repairing maraging steel components fabricated via laser-powder bed fusion (L-PBF). Specimens (100 × 50 × 2 mm) were produced in three build orientations (0°, 45°, and 90°) using maraging steel powder, followed by solution treatment and age hardening. Autogenous GTAW was employed to join both additively manufactured (AM) and conventionally processed samples. Microstructural and mechanical properties of the weldments were analyzed through optical and scanning electron microscopy, microhardness, and tensile testing. Results indicate orientation-dependent hardness in AM samples: 45° samples exhibited 16% lower, while 90° samples showed 4% higher hardness compared to conventional counterparts. Additionally, the ultimate tensile strength of 90° AM samples was 5% higher than that of conventional weldments. The findings demonstrate the potential of GTAW as a cost-effective repair strategy for L-PBF-fabricated maraging steel (grade 300) components.