Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting

2014 ◽  
Vol 29 (17) ◽  
pp. 1920-1930 ◽  
Author(s):  
William J. Sames ◽  
Kinga A. Unocic ◽  
Ryan R. Dehoff ◽  
Tapasvi Lolla ◽  
Sudarsanam S. Babu
Keyword(s):  
Electron Beam ◽  
Thermal Effects ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Microstructural Heterogeneity ◽  
Image Position

Abstract

scholarly journals Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2549 ◽  
Author(s):  
Lv Li ◽  
Xiaojuan Gong ◽  
Xianjue Ye ◽  
Jianwei Teng ◽  
Yan Nie ◽  
...  
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Oxidation Behavior ◽  
Additive Manufacture ◽  
Inconel 718 Alloy ◽  
Temperature Oxidation ◽  
Boundary Density ◽  
High Temperature Oxidation Behavior

This research was aimed at investigating the high temperature oxidation behavior of Inconel 718 superalloy fabricated by electron beam melting with the building direction of 0°, 55° and 90° deviation from the Z axis of cylindrical samples. Columnar γ-fcc phase with preferred crystal orientations was found in all specimens. With the temperature ranging from 700 to 1000 °C, the 0° sample, symbolized by the lowest grain boundary density, and largest grain size, reveals the best oxidation performance. It is concluded that the building direction has more impact on the amount of grain boundary density than crystal orientation, which determined the oxidation resistance.

scholarly journals Role of Superficial Defects and Machining Depth in Tensile Properties of Electron Beam Melting (EBM) Made Inconel 718

2021 ◽  
Author(s):  
Xiaoyu Zhao ◽  
Amir Rashid ◽  
Annika Strondl ◽  
Christopher Hulme-Smith ◽  
Niclas Stenberg ◽  
...  
Keyword(s):  
Electron Beam ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Ultimate Tensile Stress ◽  
Premature Failure ◽  
Machined Parts ◽  
Lower Yield Strength ◽  
Low Performance ◽  
Subsurface Defects

AbstractSince there is no report on the influence of machining depth on electron beam melting (EBM) parts, this paper investigated the role of superficial defects and machining depth in the performance of EBM made Inconel 718 (IN718) samples. Therefore, as-built EBM samples were analyzed against the shallow-machined (i.e., only removal of outer surfaces) and deep-machined (i.e., deep surface removal into the material) parts. It was shown that both as-built and shallow-machined samples had a drastically lower yield strength (970 ± 50 MPa), ultimate tensile stress (1200 ± 40 MPa), and ductility (28 ± 2%) compared to the deep-machined samples. This was since premature failure occurred due to various superficial defects. The superficial defects appeared in two levels, as (1) notches and pores on the surface and (2) irregular pores and cracks within the subsurface. Since the latter occurred down to 2 mm underneath the surface, shallow machining only exposed the subsurface defects to outer surfaces. Thus, the shallow-machined parts achieved only 68% and 8% of UTS and elongation of the deep-machined parts, respectively. This low performance occurred to be comparable to the as-built parts, which failed prematurely due to the high fraction surface voids and notches as well as the subsurface defects.

scholarly journals Erratum to: Comparison of Residual Stresses in Inconel 718 Simple Parts Made by Electron Beam Melting and Direct Laser Metal Sintering

2015 ◽  
Vol 46 (5) ◽  
pp. 2322-2322 ◽  
Author(s):  
L. M. Sochalski-Kolbus ◽  
E. A. Payzant ◽  
P. A. Cornwell ◽  
T. R. Watkins ◽  
S. S. Babu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Residual Stresses ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Direct Laser ◽  
Metal Sintering

scholarly journals Electron beam melting of Inconel 718: effects of processing and post-processing

2018 ◽  
Vol 34 (5) ◽  
pp. 612-619 ◽  
Author(s):  
Peeyush Nandwana ◽  
Michael Kirka ◽  
Alfred Okello ◽  
Ryan Dehoff
Keyword(s):  
Electron Beam ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Post Processing
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