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<p>This study investigates the effects of high-velocity oxy-acetylene flame treatment (FT) and along with high pressure (4&#xa0;MPa) air jet compression (AC) on the microstructural and mechanical properties of Ni-based superalloy coatings, specifically Inconel 718 (IN718), which were applied using high-velocity air fuel (HVAF) methods. Quantitative analyses revealed a ~ 40 % reduction in porosity and a refinement of dendritic structures from coarser to finer morphology<b>.</b> The coatings largely showed a compressive residual stress, but the stresses were reduced with the post-treatment, nevertheless maintaining phase stability. Field emission scanning electron microscopy (FESEM) showed improved interlamellar cohesion and fewer defects. Following flame treatment, hardness increased from 3.23 GPa (IN718 AS) to 10.99 GPa (IN718 FT), with elastic modulus enhancements of 232%. In contrast, under flame treatment with high-pressure air jet compression (FT + AC), hardness values reached an intermediate level, increased to 6.8 GPa, while the elastic modulus improved by ~ 43%. The lower hardness and elastic modulus in FT + AC compared to FT resulted from localized plastic deformation and stress relaxation induced by high-pressure air compression. This research highlights oxyacetylene flame treatment as a novel, effective, yet inexpensive solution for optimizing HVAF coatings, emphasizing its potential to enhance the performance and durability of Ni-based superalloys in advanced engineering applications.</p>

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Enhanced Microstructure and Properties of HVAF-Sprayed IN718 Coatings by Flame Treatment

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Sudha Kumari,
  • Sanjay Raj,
  • Nitya Nand Gosvami,
  • Deepak Kumar,
  • Ayan Bhowmik

摘要

This study investigates the effects of high-velocity oxy-acetylene flame treatment (FT) and along with high pressure (4 MPa) air jet compression (AC) on the microstructural and mechanical properties of Ni-based superalloy coatings, specifically Inconel 718 (IN718), which were applied using high-velocity air fuel (HVAF) methods. Quantitative analyses revealed a ~ 40 % reduction in porosity and a refinement of dendritic structures from coarser to finer morphology. The coatings largely showed a compressive residual stress, but the stresses were reduced with the post-treatment, nevertheless maintaining phase stability. Field emission scanning electron microscopy (FESEM) showed improved interlamellar cohesion and fewer defects. Following flame treatment, hardness increased from 3.23 GPa (IN718 AS) to 10.99 GPa (IN718 FT), with elastic modulus enhancements of 232%. In contrast, under flame treatment with high-pressure air jet compression (FT + AC), hardness values reached an intermediate level, increased to 6.8 GPa, while the elastic modulus improved by ~ 43%. The lower hardness and elastic modulus in FT + AC compared to FT resulted from localized plastic deformation and stress relaxation induced by high-pressure air compression. This research highlights oxyacetylene flame treatment as a novel, effective, yet inexpensive solution for optimizing HVAF coatings, emphasizing its potential to enhance the performance and durability of Ni-based superalloys in advanced engineering applications.