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




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Metallurgical and Materials Transactions A

, Volume 42, Issue 11, pp 3491–3508

First Online: 15 June 2011

Abstract

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.

Manuscript submitted December 20, 2010.

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Autor: L. E. Murr - E. Martinez - S. M. Gaytan - D. A. Ramirez - B. I. Machado - P. W. Shindo - J. L. Martinez - F. Medina

Fuente: https://link.springer.com/



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