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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
Presentation Title CALPHAD-Based Modelling of Solidification and Precipitation in LPBF 17-4PH Stainless Steel
Author(s) Yanheng Xie, Dylan Cuskelly, Églantine Herbaux, Matteo Seita
On-Site Speaker (Planned) Yanheng Xie
Abstract Scope Thermal history during laser powder bed fusion (LPBF) governs the microstructural evolution of 17-4 PH stainless steel, including the formation of Cu-rich precipitates form within a martensitic matrix. Gaining precise control over it, however, is challenging and may require several experimental iterations. We have developed a computational framework to predict the thermal history and the corresponding phase transformations that occur during LPBF of 17-4PH. Our framework integrates Scheil solidification and Mean-field precipitation kinetics models within CALPHAD, enabling the simulation of solidifying phases and solid-state phase transformations under non-equilibrium conditions that are representative of LPBF. This modelling strategy directly links laser parameters to microstructural evolution, providing an opportunity to design and tailor the alloy microstructure in-situ during LPBF. This capability enables precipitation hardening while avoiding the post-processing heat treatments that prolong production time and increase part cost, thereby improving the overall manufacturing efficiency.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Modeling and Simulation, Phase Transformations

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Ab Initio Prediction of Suitable Ceramics as Inoculants to Promote Small Equiaxed Grains by Grain Nucleation During Solidification in Additive Manufacturing
Active Thermal Management for Residual Stress Control and Microstructural Refinement in Wire-Arc Direct Energy Deposition (W-DED)
Alloy Amalgamation via Additive Manufacturing: Tailoring Strain Hardening Through Stress Induced α″ Martensitic Transformation
An Overview of Current Efforts in Developing a Digital Twin Framework for Laser-Based Additive Manufacturing Processes of Metallic Systems
CALPHAD-Based Modelling of Solidification and Precipitation in LPBF 17-4PH Stainless Steel
CALPHAD-Coupled Models of Solidification Phenomena During Metal Additive Manufacturing
CALPHAD-Guided In Situ Dilution for Additive Manufacturing of a Non-Printable Ni-Based Superalloy
Composition-Dependent Thermal Gradients and Microstructure Evolution in Multi-Material Laser Directed Energy Deposition of IN718–SS316
Composition-Sensitive Modeling of Alpha-Morphologies During Solidification and Heat Treatment in PBF-LB Ti-6Al-4V
Compression Behavior and Microstructural Analysis for Mechanical Properties Evaluation of Inconel 718 Lattice Structures
Coupled Modeling Tools for Large-Scale AM Simulations
Development of an Additively-Manufacturable Inconel 939-Type Nickel-Based Superalloy with Minimized Crack Susceptibility
Enabling Twin-Wire Arc Additive Manufacturing for High-Throughput Deposition and Dissimilar Metal Joining
Enhancing AA6061 Alloy Printability During the LPBF Process Through Zr and TiB₂ Additions and Process Parameter Optimization
Evolution of Microstructure and Mechanical Properties in Laser Powder Bed Fusion Fabricated β-Ti Alloy: Integrated Experimental and Computational Approach
Exploring Omega Phase Formation During DED and Its Role in Phase Evolution and Deformation Mechanism of Ti-Cr Alloys
F-41: Additive Manufacturing of Co-Based Superalloys Via Direct Ink Writing
F-42: Formation Behavior of Cr2Nb Phase in Cu-4Cr-2Nb Alloy Produced by L-PBF Process
F-43: Maraging Steels with Enhanced Strength-Ductility Synergy Via Additive Manufacturing
F-44: Mechanical Behavior of GRCop-42 Alloy with Nanoprecipitates Prepared by Laser Powder Bed Fusion
F-45: Microstructure and Strengthening Mechanisms in Cu-10Sn Alloys Manufactured by Laser Beam Powder Bed Fusion
F-46: Novel Spot Scan Strategy for Enhanced Microstructural Control in Electron Beam Powder Bed Fusion of Ti-6Al-4V
From Melt Pool to Microstructure: Optimizing Aluminum Wire DED with Blue Lasers
Grain Refinement by Laser-Generated Ultrasound for the Powder Bed Fusion–Laser Beam Process
Linkage Between Process-Induced Microstructure and Magnetic Property of Nd-Fe-B Permanent Magnets Additively Manufactured by Laser Powder Bed Fusion
Mechanism of Epitaxy Loss and Its Correlation with Solidification Microstructure in Laser Powder Bed Fusion
Microstructure and Mechanical Properties of WAAM-Processed Aluminum Alloys with Inoculants and α-Al(Fe,Mn)Si Precipitates
Microstructure and Thermal Behavior of Inconel–GRCop42 Dissimilar Joints Fabricated via Powder-Based Laser Directed Energy Deposition
Model Experiment for Investigation of Thermoelectric Magnetohydrodynamics in Metal Additive Manufacturing
Modification of Casting Aluminum Alloys Using Grain Refinement Strategies for LPBF Applications
Non-Equilibrium Partitioning and Cellular Growth in Alloys: A Quantitative Multiscale Modeling Approach
On the Occurrence of Rapid Solidification During Laser Powder-Bed Fusion of Metallic Alloys
Pathways to Experimental Analysis of Microstructure Evolution in Additive Manufacturing
Prediction of composition-dependent grain structures in LPBF austenitic stainless steel using a two-phase cellular automata model
Process–Microstructure–Property Correlations in Cu–Ni 70/30 Additively Manufactured at Varying Energy Densities Using Laser Wire Directed Energy Deposition
Real Time Observation of Sintering Kinetics and Alloying Behaviors Using In-Situ TEM Laser Heating
Revisiting the Al-Si phase diagram upon a broad range of cooling rates
Solidification Behavior and Weldability of Cu-Based Feedstock Processed with Directed Energy Deposition
Solidification Driven Hf Segregation and Concomitant Dislocation Cell Formation During Additive Manufacturing of Nb-Hf-Ti Alloys
Solidification Modes and Microstructural Evolution in Additively Manufactured AlCoCrFeNi Multi-Principal Element Alloys
Thermally Driven Non-Equilibrium Phase Formation Effect on Mechanical and Corrosion Behavior of Wire-Arc Directed Energy Deposited FeCr-Based High Entropy Alloy
Thermo-Solutal Conditions for Melt Pool Solidification in Laser Direct Energy Deposition of Bi-Metallic Structures
Thermokinetics Driven Evolution of Microstructures in Laser Additive Manufactured TiAl Alloy
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