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Title: Numerical modeling of heat-transfer and the influence of process parameters on tailoring the grain morphology of IN718 in electron beam additive manufacturing

Journal Article · · Acta Materialia
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2]; ORCiD logo [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The fabrication of 3-D parts from CAD models by additive manufacturing (AM) is a disruptive technology that is transforming the metal manufacturing industry. The correlation between solidification microstructure and mechanical properties has been well understood in the casting and welding processes over the years. This paper focuses on extending these principles to additive manufacturing to understand the transient phenomena of repeated melting and solidification during electron beam powder melting process to achieve site-specific microstructure control within a fabricated component. In this paper, we have developed a novel melt scan strategy for electron beam melting of nickel-base superalloy (Inconel 718) and also analyzed 3-D heat transfer conditions using a parallel numerical solidification code (Truchas) developed at Los Alamos National Laboratory. The spatial and temporal variations of temperature gradient (G) and growth velocity (R) at the liquid-solid interface of the melt pool were calculated as a function of electron beam parameters. By manipulating the relative number of voxels that lie in the columnar or equiaxed region, the crystallographic texture of the components can be controlled to an extent. The analysis of the parameters provided optimum processing conditions that will result in columnar to equiaxed transition (CET) during the solidification. Furthermore, the results from the numerical simulations were validated by experimental processing and characterization thereby proving the potential of additive manufacturing process to achieve site-specific crystallographic texture control within a fabricated component.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1252143
Alternate ID(s):
OSTI ID: 1351003
Journal Information:
Acta Materialia, Vol. 112, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 293 works
Citation information provided by
Web of Science

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Cited By (25)

Machine Learning-Enabled Competitive Grain Growth Behavior Study in Directed Energy Deposition Fabricated Ti6Al4V journal November 2019
A computational study on the three-dimensional printability of precipitate-strengthened nickel-based superalloys
  • Basoalto, H. C.; Panwisawas, C.; Sovani, Y.
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 474, Issue 2220 https://doi.org/10.1098/rspa.2018.0295
journal December 2018
Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing journal September 2019
Microstructure modelling for metallic additive manufacturing: a review journal October 2019
Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting journal May 2019
Distinction in Anodic Dissolution Behavior of Inconel 718 Prepared by Different Forming Technologies journal January 2018
Nanomechanical Characterization of Laser Peened Additively Manufactured Inconel 718 Superalloy journal July 2019
Single-Track Melt-Pool Measurements and Microstructures in Inconel 625 journal February 2018
State of the Art and Emerging Trends in Additive Manufacturing: From Multi-Material processes to 3D printed Electronics journal January 2018
Uncertainty analysis of microsegregation during laser powder bed fusion journal February 2019
Design of novel materials for additive manufacturing - Isotropic microstructure and high defect tolerance journal January 2018
Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting text January 2019
Strong and ductile reduced activation ferritic/martensitic steel additively manufactured by selective laser melting text January 2019
No more tears for metal 3D printing journal September 2017
Single-Track Melt-Pool Measurements and Microstructures in Inconel 625 text January 2018
Short review on modeling approaches for metal additive manufacturing process journal March 2019
Asymmetric Cracking in Mar-M247 Alloy Builds During Electron Beam Powder Bed Fusion Additive Manufacturing journal July 2018
Uncertainty Analysis of Microsegregation during Laser Powder Bed Fusion text January 2019
Additive Manufacturing of Nickel Superalloys: Opportunities for Innovation and Challenges Related to Qualification journal June 2018
Influence of build layout and orientation on microstructural characteristics of electron beam melted Alloy 718 journal September 2018
Grain structure control during metal 3D printing by high-intensity ultrasound journal January 2020
Numerical and experimental analysis of heat distribution in the laser powder bed fusion of Ti-6Al-4V journal June 2018
Effect of Constituent Materials on Composite Performance: Exploring Design Strategies via Machine Learning journal April 2019
Tuning of Calcite Crystallographic Orientation to Support Brachiopod Lophophore journal May 2018
Additive Manufacturing of Alloy 718 via Electron Beam Melting: Effect of Post-Treatment on the Microstructure and the Mechanical Properties journal December 2018

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