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Meeting MS&T22: Materials Science & Technology
Symposium Alloy Phase Transformations at Elevated Temperatures
Presentation Title Hyper Duplex Stainless Steel: A Study on the Sigma Phase Formation
Author(s) Andres Acuna, Antonio Ramirez
On-Site Speaker (Planned) Andres Acuna
Abstract Scope The high alloying content of the recently developed hyper duplex stainless steel (HDSS) provides remarkable corrosion resistance, PREn > 49, and a balanced ferrite austenite microstructure. However, due to the Cr and Mo content, this alloy is susceptible to sigma phase formation. An extensive sigma phase formation study was conducted on HDSS developing precipitation experimental data, JMAK analytical calculations, and a computational kinetic model. Isothermal heat treatments produced specimens for SEM characterization. The quantified sigma volume fraction developed a TTT map to adjust and validate the computational model and the JMAK calculations. We found that sigma kinetics is highest at 900 oC -920oC in isothermal conditions. However, in conditions of continuous cooling processes, cooling rates faster than 4oC/s do not cause sigma precipitation. The established kinetic model allows the prediction of sigma formation based on the applied cooling rates. Hence, allowing optimization of the welding parameters to avoid sigma presence.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing Design of Metal Matrix Composites of Stainless Steel 316 and Inconel 718
Alternate Phase Transformation Paths in a Nb-50Ti Alloy in the Presence of Oxygen Interstitials
Develop Precipitation-Strengthened Refractory High Entropy Alloys for Turbine Blades Applications above 1300 Degree Celsius
E-1: Multiscale Modeling of Solidification Processes for Metal & Alloys
Effect of Grain Boundary Phases on Creep Properties of a Novel Ni-Co Based Superalloy
Examining the Influence of Nitride Precipitation on the Performance of Additively Manufactured Nickel Superalloys
Hyper Duplex Stainless Steel: A Study on the Sigma Phase Formation
Impact of Manufacturing Processes on Phase Transformations in High-temperature Alloys: Some Thoughts Based on Representative Case Studies
In-situ Neutron Characterization of Thermomagnetic Processes Utilizing Direct Induction Heating
Metallic Alloy Microstructure Prediction and Control with Processing
Microstructure and Mechanical Properties of W-free γ + γ' Co-based Superalloys with Ni, Cr, and Fe Additions
Microstructure Evolution and Mechanical Properties of α′/α″-Strengthened Ferritic Superalloys
On the Shapes of Time-Temperature-Transformation Curves across Alloys and Reactions
Phase Stability in Cast and Additively Manufactured Al-9 wt%Cu-6 wt%Ce Alloy
Precipitation Strengthening in BCC Al2.7CrMnTiV High-Entropy Alloys
Precursor Metastable Phases and Their Influence on α Precipitation in the Metastable β-titanium Alloy, Ti-5Al-5Mo-5V-3Cr
Single-step Aging Treatment on Cast Haynes 282 Ni-based Alloy – Microstructure and Mechanical Behavior
Solidification Modelling With CALPHAD: Process Applications of Equilibrium and Non-equilibrium Models and When to Use Them
Study of Thermal Decomposition of γ’-Fe4N Using Molecular Dynamics Simulation
The Optimization of Local Phase Transformation Strengthening in Next Generation Superalloys
Thermal Stability and Time-temperature-transformation Diagrams of Co-rich Nanocomposite Ribbons
Tracking Changes in Microstructure and Mechanical Properties of Electron Powder Bed Fusion Produced Inconel-738

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