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<p>In this paper, the repeatability of laser powder bed fusion (LPBF) process during the additive manufacturing (AM) of Inconel Alloy 718 (IN718) is thoroughly investigated. The main objective is to study batch to batch consistency with respect to repeatably&#xa0;and reproducibility of the AM process and its effect on mechanical and microstructural characteristics. This study further compares properties of LPBF IN718 alloy with its wrought counterpart. The results indicate high repeatability in microstructural characteristics, such as grain size and phase distribution, across multiple printing batches of Inconel Alloy 718. Microscopic analysis showed presence of long columnar grains parallel to build direction and fine equiaxed grains perpendicular to it. Additionally, evaluations of mechanical properties including yield strength (YS), ultimate tensile strength (UTS), and elongation at fracture (<i>e</i><sub>f</sub>) generally show little variation across various batches, demonstrating excellent repeatability&#xa0;and reproducibility. YS and UTS were observed to be ~ 1200 and ~ 1400&#xa0;MPa, respectively, for all samples with near isotropy. On the other hand, elongation to failure exhibited anisotropy with orientation parallel to build direction having higher elongation (&gt; 20%) compared to orientation perpendicular to it (&lt; 20%). Upon comparison with its wrought counterpart, the tensile strength of specimens printed through LPBF was higher than specimens processed through conventional wrought manufacturing, whereas elongation revealed an opposite tread.</p>

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Repeatability and Reproducibility in Microstructural and Mechanical Properties of Laser Powder Fusion Processed Inconel 718

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Kartikey Sharma,
  • Ravi Ranjan Kumar,
  • Rajeev Verma,
  • Robert Johnson,
  • S. V. S. Narayana Murty

摘要

In this paper, the repeatability of laser powder bed fusion (LPBF) process during the additive manufacturing (AM) of Inconel Alloy 718 (IN718) is thoroughly investigated. The main objective is to study batch to batch consistency with respect to repeatably and reproducibility of the AM process and its effect on mechanical and microstructural characteristics. This study further compares properties of LPBF IN718 alloy with its wrought counterpart. The results indicate high repeatability in microstructural characteristics, such as grain size and phase distribution, across multiple printing batches of Inconel Alloy 718. Microscopic analysis showed presence of long columnar grains parallel to build direction and fine equiaxed grains perpendicular to it. Additionally, evaluations of mechanical properties including yield strength (YS), ultimate tensile strength (UTS), and elongation at fracture (ef) generally show little variation across various batches, demonstrating excellent repeatability and reproducibility. YS and UTS were observed to be ~ 1200 and ~ 1400 MPa, respectively, for all samples with near isotropy. On the other hand, elongation to failure exhibited anisotropy with orientation parallel to build direction having higher elongation (> 20%) compared to orientation perpendicular to it (< 20%). Upon comparison with its wrought counterpart, the tensile strength of specimens printed through LPBF was higher than specimens processed through conventional wrought manufacturing, whereas elongation revealed an opposite tread.