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In recent times, wire-arc additive manufacturing (WAAM) has emerged as a versatile and highly productive method for producing various structural materials. This innovative technique has garnered significant attention across multiple industrial sectors, owing to its adaptability and efficiency. In this study, St-52 alloy steel samples were manufactured by the WAAM method on St-37 alloy steel substrate employing different fabricating angles of 60°, and microstructure was investigated. Observing the melt-pools has yielded valuable insights into the impact of the arc’s heat on the substrate microstructure. This occurs during the entire cycle of wire melting and subsequent solidification in the WAAM process, with consistent process parameters maintained across all samples. Notably, finer microstructures were observed in the top layers across all strategies. However, as the angle of the initial additive layer decreased, there was a significant increase in heat effects on the substrate, leading to a broader area impacted by the arc’s heat input. Moreover, in the recrystallized microstructure, the grain size at the interfaces transformed into the subsequent layer until the layer’s manufacturing concluded.

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Effect of Manufacturing Strategy on Microstructure of a Low-Carbon Steel Alloy Fabricated with Wire-Arc Additive Manufacturing

  • 会议论文

  • 发表日期：

    2025年

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  • Mojtaba Karamimoghadam,
  • Yahya Aghayar,
  • Foroozan Forooghi,
  • Mohsen Mohammadi,
  • Nicola Contuzzi,
  • Giuseppe Casalino

摘要

In recent times, wire-arc additive manufacturing (WAAM) has emerged as a versatile and highly productive method for producing various structural materials. This innovative technique has garnered significant attention across multiple industrial sectors, owing to its adaptability and efficiency. In this study, St-52 alloy steel samples were manufactured by the WAAM method on St-37 alloy steel substrate employing different fabricating angles of 60°, and microstructure was investigated. Observing the melt-pools has yielded valuable insights into the impact of the arc’s heat on the substrate microstructure. This occurs during the entire cycle of wire melting and subsequent solidification in the WAAM process, with consistent process parameters maintained across all samples. Notably, finer microstructures were observed in the top layers across all strategies. However, as the angle of the initial additive layer decreased, there was a significant increase in heat effects on the substrate, leading to a broader area impacted by the arc’s heat input. Moreover, in the recrystallized microstructure, the grain size at the interfaces transformed into the subsequent layer until the layer’s manufacturing concluded.