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<p>Anisotropy remains a major challenge in WAAM-fabricated parts, making it essential to evaluate and quantify anisotropy to understand its causes and impact on the fabricated components. This study focuses on orientation-based anisotropy and corrosion behavior of Inconel 718, a nickel-based superalloy fabricated using wire and arc additive manufacturing (WAAM). Tensile testing revealed anisotropic behavior, with Diagonal-45° specimens exhibiting superior mechanical properties, including a higher ultimate tensile strength of 725-771&#xa0;MPa and a strain-hardening exponent of 0.604. Yield Strength (YS) ranged from 412 to 442&#xa0;MPa, while elongation varied from 48.8 to 54.9%. Inter-layer softening reduced tensile strength and anisotropy, especially in Transverse-90° samples. Fracture surface analysis highlighted orientation-dependent failure mechanisms, emphasizing grain alignment effects. Corrosion resistance, assessed via potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), showed a higher corrosion rate at the top (0.01215&#xa0;mm/year) than at the middle (0.008729&#xa0;mm/year) and bottom (0.007255&#xa0;mm/year).</p>

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Orientation-Induced Anisotropy, Failure Mechanisms, and Corrosion Behavior of Wire and Arc Additively Manufactured Nickel-Based Superalloy Structure

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • M. Karmuhilan,
  • Somasundaram Kumanan,
  • M. Venkatesh Kannan

摘要

Anisotropy remains a major challenge in WAAM-fabricated parts, making it essential to evaluate and quantify anisotropy to understand its causes and impact on the fabricated components. This study focuses on orientation-based anisotropy and corrosion behavior of Inconel 718, a nickel-based superalloy fabricated using wire and arc additive manufacturing (WAAM). Tensile testing revealed anisotropic behavior, with Diagonal-45° specimens exhibiting superior mechanical properties, including a higher ultimate tensile strength of 725-771 MPa and a strain-hardening exponent of 0.604. Yield Strength (YS) ranged from 412 to 442 MPa, while elongation varied from 48.8 to 54.9%. Inter-layer softening reduced tensile strength and anisotropy, especially in Transverse-90° samples. Fracture surface analysis highlighted orientation-dependent failure mechanisms, emphasizing grain alignment effects. Corrosion resistance, assessed via potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), showed a higher corrosion rate at the top (0.01215 mm/year) than at the middle (0.008729 mm/year) and bottom (0.007255 mm/year).