Microstructural Architecture, Microstructures, and Mechanical Properties for a Nickel-Base Superalloy Fabricated by Electron Beam Melting

By L. Murr, E. Martinez, S. Gaytan, D. A. Ramirez, B. I. Machado, P. Shindo, J. Martínez, Francisco Medina, J. Wooten, D. Ciscel and 2 more. 2011

277 citations recorded by the source corpus.

Microstructures and a microstructural, columnar architecture as well as mechanical behavior of as-fabricated and processed INCONEL alloy 625 components produced by additive manufacturing using electron beam melting (EBM) of prealloyed precursor powder are examined in this study. As-fabricated and hot-isostatically pressed (“hipped”) [at 1393 K (1120 °C)] cylinders examined by optical metallography (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive (X-ray) spectrometry (EDS), and X-ray diffraction (XRD) exhibited an initial EBM-developed γ″ (bct) Ni3Nb precipitate platelet columnar architecture within columnar [200] textured γ (fcc) Ni-Cr grains aligned in the cylinder axis, parallel to the EBM build direction. Upon annealing at 1393 K (1120 °C) (hot-isostatic press (HIP)), these precipitate columns dissolve and the columnar, γ, grains recrystallized forming generally equiaxed grains (with coherent {111} annealing twins), containing NbCr2 laves precipitates. Microindentation hardnesses decreased from ~2.7 to ~2.2 GPa following hot-isostatic pressing (“hipping”), and the corresponding engineering (0.2 pct) offset yield stress decreased from 0.41 to 0.33 GPa, while the UTS increased from 0.75 to 0.77 GPa. However, the corresponding elongation increased from 44 to 69 pct for the hipped components.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/797dcf53470d6ebae568ae7d8216f9de5968f3ab

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In Automotive Engineering

1. T. Mukherjee
2. T. DebRoy
3. H. Wei
4. Amitava De
5. Wei Zhang
6. J. Elmer
7. J. Zuback
8. J. Milewski

In Mechanical Engineering

1. T. DebRoy
2. T. Mukherjee
3. H. Wei
4. Amitava De
5. J. Elmer
6. Wei Zhang
7. J. Zuback
8. J. Milewski

Citations in the corpus

• Additive manufacturing of metallic components – Process, structure and properties (2018, background): “There is an abundance of literature reporting densities lower than theoretical densities owing to porosity for aluminum alloys [35,148,179,189,270,548,555,640–650], steels [651–657], nickel base alloys [180,368,378,401,494,503,507,509,658,659], stainless steels [33,205,267,312,357,468,469,485,660,66”
• Metal Binder Jetting Additive Manufacturing: A Literature Review (2020, background): “Powder bed fusion [18, 19, 21-23, 32-44]  High accuracy  Fully dense parts  Good mechanical properties  High cost (both machine depreciation and operation)  Significant residual stress  Support material required”