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Microstructure and Properties of Inconel 625 Fabricated Using Two Types of Laser Metal Deposition Methods.

Jan Dutkiewicz1, Łukasz Rogal1, Damian Kalita1

  • 1Institute of Metallurgy and Materials Science, Polish Academy of Sciences, PAS, 25, Reymonta St., 30-059 Krakow, Poland.

Materials (Basel, Switzerland)
|November 13, 2020
PubMed
Summary

Laser-engineered net shaping (LENS) produced stronger Inconel 625 with higher yield and tensile strength than CO2 laser deposition, despite similar microstructures and lower elongation.

Keywords:
CO2 laser depositionInconel 625laser engineered net shaping (LENS)

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Metallurgy

Background:

  • Inconel 625 is a high-performance alloy widely used in demanding applications.
  • Additive manufacturing offers novel fabrication routes for complex metallic components.
  • Understanding the influence of deposition techniques on material properties is crucial for optimizing performance.

Purpose of the Study:

  • To investigate the impact of two distinct laser deposition systems on the microstructure and mechanical characteristics of Inconel 625.
  • To compare laser-engineered net shaping (LENS) with high-power CO2 laser deposition for Inconel 625 fabrication.
  • To correlate microstructural features with mechanical property variations.

Main Methods:

  • Fabrication of Inconel 625 samples using LENS and high-power CO2 laser deposition.
  • Microstructural characterization via light microscopy (LM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM).
  • Mechanical property evaluation through tensile testing and microhardness measurements.

Main Results:

  • Both LENS and CO2 laser deposition resulted in dendritic microstructures with Ti-, Mo-, and Nb-rich precipitates at cell boundaries.
  • High-power laser deposition induced a strong <100> build texture, while low-power processing increased the {011} <100> Goss component.
  • LENS-fabricated Inconel 625 exhibited higher average yield strength (524 MPa vs. 472 MPa) and ultimate tensile strength (944 MPa vs. 868 MPa), but lower elongation (35% vs. 42%) compared to CO2 laser deposition.

Conclusions:

  • The choice of laser deposition system significantly influences the texture and mechanical properties of Inconel 625.
  • LENS processing yields superior tensile strength and yield strength in Inconel 625 compared to high-power CO2 laser deposition.
  • Microstructural similarities suggest that texture and processing parameters play key roles in the observed mechanical property differences.