Columnar Microstructural Architecture in Electron and Laser Beam Melting of Metals and Alloys

Unlike more conventional directional solidification, electron and laserbeam melting technologies involve building 3D components through layer-by-layer melt/solidification thermal cycling which creates novel, directional microstructural architectures. In this study we compared 3D optical metallograph...

Full description

Saved in:
Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Martinez, Edwin, Murr, Lawrence, Gaytan, Sara, Amato, Krista, Shindo, Patrick, Ramirez, Diana, Medina, Francisco, Martinez, Jose, Machado, Brenda, Wicker, Ryan
Format: Article
Language:English
Subjects:
Alloys
Architecture
COBALT ALLOYS (50 TO 99 CO)
Cobalt base alloys
Columns (structural)
COPPER OXIDE
DIRECTIONAL SOLIDIFICATION
LASERS
MELTING
Microstructure
MICROSTRUCTURES
NICKEL ALLOYS (50 TO 99 NI)
Nickel base alloys
PRECIPITATES
Precipitation
Superalloys
Texture
TEXTURES
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Unlike more conventional directional solidification, electron and laserbeam melting technologies involve building 3D components through layer-by-layer melt/solidification thermal cycling which creates novel, directional microstructural architectures. In this study we compared 3D optical metallographic image composite observations of columnar microstructural architectures in Cu, Co-29-Cr-6Mo-0.2C alloy and Ni-22Cr-9Mo-4Nb (alloy 625) fabricated by electron beam melting (EBM), and Ni-19Cr-19Fe-5Nb-1Al (alloy 718) by selective laser melting (SLM). Cu produced discontinuous columns of Cu2O precipitates while the Cobase alloy exhibited similar columns of cr23c6 precipitates. The ally 625 produced columns of Ni3Nb ( gamma "-bct) precipitates. All of the EBMproduced columnar microstructure arrays were spaced ~2 m. In contrast, the SLM fabricated alloy 718 contained columnar microstructural arrays of NI3Nb ( gamma ") spaced ~0.8 mu m. Columnar grain structures with prominent [200] texture were also observed for these layer fabricated components by XRD analysis, and TEM analysis confirmed precipitate morphologies and crystallographic coincidences.
ISSN:0094-243X