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Meeting Materials Science & Technology 2020
Symposium Interfaces and Phase Transformations
Presentation Title Phase Transformations in High-Temperature Industrial Applications: An Experimental and Computational Study of Nitridation in Commercial Austenitic Stainless Steel
Author(s) Alice Young, Milo Kral, Catherine Bishop
On-Site Speaker (Planned) Alice Young
Abstract Scope Service conditions in methanol production plants create a driving force for nitrogen uptake in austenitic stainless steel piping, resulting in formation of internal nitrogen-rich precipitates. Such precipitates severely reduce the ductility of the material, increasing the likelihood of unexpected failure. Understanding the factors influencing phase transformation during the nitridation process is a critical first step towards being able to anticipate such failures. In this work, nitridation of the widely used Alloy 800H was studied at service-relevant temperatures 800-1000C. Both experimental and computational approaches were used. Phase identification and characterisation of precipitate-matrix interface morphology and crystallography was conducted using both scanning and transmission electron microscopy. In conjunction, a finite-difference model for nitridation of 800H was developed. All phase stability and diffusion data was calculated using Thermo-Calc and DICTRA. Experimental observations were used to inform incorporation of key thermodynamic and kinetic factors affecting transformation rates, such as precipitate morphology and nucleation barriers.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media
Computing the Free Energy and Mobility of Cylindrical Interfaces
Localized Phase Transformation at Interfaces – A New Alloy Design Strategy
Microstructure and Mechanical Properties of Pre-aged Thermo-Mechanically Processed NiTiHf Shape Memory Alloy
Phase Transformations in High-Temperature Industrial Applications: An Experimental and Computational Study of Nitridation in Commercial Austenitic Stainless Steel
Refining Alpha Microstructure via Dual-phase Interface and Twin Boundary in Beta Titanium Alloys
Shear-mediated Interfacial Structure Evolution in Nanoscale FCC Gold
Study of Strain Rate and Temperature Dependent Behavior of Pseudo-morphic bcc Mg within the Mg/Nb Nanocomposites

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