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This research investigates the feasibility of applying the gas tungsten wire arc additive manufacturing (GT-WAAM) process to fabricate components from 17-4PH steel. The study reveals that the process enables accurate fabrication without visible defects, and it evaluates the microstructure and microhardness of the material. Anisotropy is observed in both aspects. The microstructure consists of a nickel-γ matrix, characterized by elongated columnar dendrites and intermetallic phases in the interdendritic regions. Notably, Ni2Mo4C carbide is concentrated in the lower regions due to prolonged heat accumulation, while dislocation density and subgrain boundaries increase from top to bottom. The uniform microhardness across the as-deposited specimens is attributed to the influence of strong directional dendrites on microstructural evolution. This research contributes valuable insights into the relationship between additive manufacturing processes and material properties, paving the way for future advancements in metal additive manufacturing technologies.

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Analysis of Microstructure and Microhardness of 17-4PH Steel by Wire Arc Additive Manufacturing

  • 会议论文

  • 发表日期：

    2026年

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  • C. Rajaravi,
  • M. Selvam,
  • R. Ganapathy Srinivasan,
  • A. Thamarai Selvan

摘要

This research investigates the feasibility of applying the gas tungsten wire arc additive manufacturing (GT-WAAM) process to fabricate components from 17-4PH steel. The study reveals that the process enables accurate fabrication without visible defects, and it evaluates the microstructure and microhardness of the material. Anisotropy is observed in both aspects. The microstructure consists of a nickel-γ matrix, characterized by elongated columnar dendrites and intermetallic phases in the interdendritic regions. Notably, Ni2Mo4C carbide is concentrated in the lower regions due to prolonged heat accumulation, while dislocation density and subgrain boundaries increase from top to bottom. The uniform microhardness across the as-deposited specimens is attributed to the influence of strong directional dendrites on microstructural evolution. This research contributes valuable insights into the relationship between additive manufacturing processes and material properties, paving the way for future advancements in metal additive manufacturing technologies.