Abstract
High gamma prime (γ′) nickel-based alloys produced by selective electron beam melting are of interest to the turbine industry which requires control of microstructure in relation to loading conditions within complex component geometry. Welding literature predicts cracking and microstructure evolution as a function of alloy composition and process parameters in this class of alloys. In addition, Additive manufacturing causes variations in the above conditions due to the interaction of geometry on processing and heat transfer. The influence of geometry on processing conditions was explored for alloy Rene N5 by characterizing the solidification grain microstructure and solid-state precipitation. A Semi-Analytical Heat Transfer Model was employed to explain the resulting variation in solidification grain morphology that occurred due to the part geometry. The as-built precipitation structure was found to vary as a function of build height and had no correlation to the solidification grain structure or the layer geometry.
| Original language | English |
|---|---|
| Pages (from-to) | 5080-5096 |
| Number of pages | 17 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 49 |
| Issue number | 10 |
| DOIs | |
| State | Published - Oct 1 2018 |
Bibliographical note
Publisher Copyright:© 2018, The Minerals, Metals & Materials Society and ASM International.
Funding
This work was supported by the Air Force Research Laboratory (AFRL) [Contract Number FA8650-15-C-5205]. CURTIS LEE FREDERICK and AUSTIN STAUB are with the Material Science and Engineering, University of Tennessee, Knoxville, TN. ALEXANDER PLOTKOWSKI and MICHAEL M. KIRKA are with the Manufacturing Demonstration Facility, Oak Ridge National Laboratory, Oak Ridge, TN and also with the Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN. MICHAEL HAINES is with Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN. EDWIN J. SCHWALBACH is with the Materials and Manufacturing Directorate, Air Force Research Lab, Wright-Patterson Airforce Base, OH. DAVID CULLEN is with the Materials Science and Technology Division, Oak Ridge National Laboratory. S.S. BABU is with the Material Science and Engineering, University of Tennessee, with the Manufacturing Demonstration Facility, Oak Ridge National Laboratory, with the Materials Science and Technology Division, Oak Ridge National Laboratory, with the Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, and also with the Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN. Contact e-mail: [email protected] This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (<http://energy.gov/d ownloads/doe-public-access-plan>). Manuscript submitted January 22, 2018. Article published online August 1, 2018 A reduced-volume build chamber was designed by Daniel Galicki, with input from Frank Medina and Michael Massey. Arcam setup with the help of Scott Marlow and Larry Lowe. Arcam processing parameter control with the support of Ryan Dehoff. Etching was performed by Tom Geer. TEM foil preparation was completed with the help of Benjamin Shassere. Beam path files for modeling were created with the help of Michael Goin. This work was supported by the Air Force Research Laboratory (AFRL) [Contract Number FA8650-15-C-5205]. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (<http://energy.gov/downloads/doe-public-access-plan >). Manuscript submitted January 22, 2018.
| Funders | Funder number |
|---|---|
| DOE Public Access Plan | |
| United States Government | |
| U.S. Department of Energy | |
| Air Force Research Laboratory | DE-AC05-00OR22725, FA8650-15-C-5205 |
