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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
Presentation Title Long-term Process Stability in Laser Powder Bed Fusion
Author(s) Michael Heiden, Scott Jensen, Jay Carroll, Priya Pathare, David Saiz, Jonathan Pegues, Bradley Jared, Brad Boyce
On-Site Speaker (Planned) Michael Heiden
Abstract Scope While the geometric design freedom allowed by laser powder bed fusion (L-PBF) enables creation of complex parts with fine features, challenges associated with process qualification can deter wider adoption. Furthermore, a lack of historical performance data for statistical process control of witness coupons lowers confidence in the AM process. Here, we demonstrate long-term monitoring and variability assessment using small-featured (~1 mm) and larger material witness coupons. More than 550 tensile bars and 80 Charpy bars were built alongside various 316L L-PBF stainless steel parts to monitor tensile properties, density, hardness, and Charpy impact toughness. This collection of measurements was used to determine detectable property shifts correlated to L-PBF process changes. This study not only reveals the utility of monitoring process control via witness coupons but illustrates the sensitivity of different coupon types to detect L-PBF process changes. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Process Technology, Mechanical Properties

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Computer Vision and Deep Learning for Porosity Analysis in Additive Manufacturing
A Study of Microstructural and Mechanical Properties of 14YWT Oxide Dispersion Strengthened Steel Fabricated Using Laser Powder Bed Fusion Additive Manufacturing from Gas Atomized Reaction Synthesis Feedstock
Additive Manufacturing Beyond the Gaussian Beam: Insights from Microstructure-based Modeling Studies
Build Geometry and Parameter Influence on Alloy 718 Microstructure, Properties and Spatial Variation in Additive Manufacturing
Characterization of Titanium Additions in Selectively Laser Melted High-strength Aluminum Alloy by Correlative X-ray and Electron Microscopy
Control of Residual Stress and Distortion in Metal Additive Manufacturing via Inverse Mapping of Textures
Correlative Modeling of Laser Powder Bed Fusion Surface Characteristics to Internal Defects
Effects of Laser Process Parameters on Denudation Zone Width in Laser Powder Bed Fusion Additive Manufacturing
Effects of Processing Conditions and Build Geometry on Microstructure Development in Laser Powder Bed Fusion and Wire Arc Additively Manufactured 316L
Heterogeneous Microstructure and Location-specific Mechanical Performance of Ti-6Al-4V Parts Made by Laser Directed Energy Deposition
In Situ Monitoring of Recrystallization during Laser Powder Bed Fusion of 316L Stainless Steel by Means of Synchrotron X-ray Diffraction
Intentionally Seeding Pores in Laser Powder Bed Fusion IN718: Microstructure, Defects, and Fatigue
Large-scale Image Analysis of Melt Pools in Complex Additively Manufactured Artifacts
Location Specific Characterization of Additively Manufactured Stainless Steel to Inform Build Data Analytics
Long-term Process Stability in Laser Powder Bed Fusion
Microstructural and Mechanical Validation of Thin-walled Additively Manufactured Inconel 625
Microstructure and Mechanical Property Variations in Commercially Produced Laser Powder Bed Fusion 316L Stainless Steel
Microstructure Evolution According to Heat Treatment Design of Alloy 625 Produced by Selective Laser Melting
NASA’s Approach on the Evaluations of “Material Engineering Equivalence” Methodology in Achieving and Sustaining Efficient Qualification and Certification of AM Materials and Parts
Opportunities & Challenges with Laser Powder Bed Fusion for Automotive Applications: Steel and Aluminum Alloys
Optimizing Creep Performance of Haynes 282 Printed via Laser Powder Bed Fusion through Microstructure Control
Predicting Crystallographic Texture in Laser Powder Bed Fusion via a Machine Learning Approach
Quantification of Microstructural Heterogeneities in Additively Manufactured and Heat-Treated Haynes 282
Quantitative Analysis of Computed Tomography Characterization of Porosity in AM Ti64 Using Serial Sectioning Ground Truth
Quantitative Analysis of Low Concentration Elements at the Nanoscale in Additively Manufactured Alloys
Strategizing with Hot Isostatic Pressing Treatments to Increase Productivity during Post-processing of Laser-melted Inconel 718 Parts
Strong Impact of Minor Elements on the Microstructural Evolution of an Additively Manufactured Inconel 625 Alloy
Synchrotron-based X-ray Microtomography Characterization of Solidification Cracks in Additively Manufactured IN738LC Alloy
The Impact of Volumetric Energy Density on Mechanical Properties of Additively Manufactured 718 Ni Alloy
Towards Validation of Thermo-mechanical Finite Element Modeling of the Additive Manufacturing Solidification Process
Use of Profilometry-based Indentation Plastometry (PIP) to Study Inhomogeneities in Additively Manufactured Components
X-ray Diffraction Peak Estimation Using In-Situ Melt-pool Sensors

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