HIGHLIGHTS ADVANCED MATERIALS & PROCESSES | MAY/JUNE 2024 54 and engineering, it is imperative that we not only strive for enhanced materials performance, thereby enabling technological development, but also endeavor to purposefully reduce the negative consequences of materials selection, design, and discovery. This multi-attribute objective function requires that we simultaneously address performance, economics, chemical safety (toxicity), energy demand, and materials circularity (waste). A rapidly evolving suite of decision tools and databases, including the strategic application of artificial intelligence and machine learning, can facilitate these essential sustainability-informed decisions. 2024 Edward DeMille Campbell Memorial Lecture Tuesday, October 1 | 10:30 – 11:30 a.m. At IMAT in Cleveland Prof. Christopher A. Schuh, FASM Dean, Robert R. McCormick School of Engineering and Applied Science, John G. Searle Professor of Materials Science and Engineering, Northwestern University, Evanston, Ill. “The Coming Age of Computationally Designed Grain Boundary Chemistry” We have known for many decades that grain boundaries (GBs) not only affect, but often dominate, the properties of polycrystals. And yet our understanding of structure-chemistry-property connections for GBs has largely focused on individual cases, specific alloys, and certain high-symmetry boundaries. Through that focused effort, GB science has come a long way in its ability to explain specific observations. The premise of this talk, however, is that we are now entering the age of GB design, in which the tools of computation and data science allow us, for the first time, to rigorously address the “inverse problem:” designing polycrystalline materials from a blank slate to achieve GB networks with desired structures and properties. The key to this paradigm shift is the ability to treat all the diverse atomic environments in the GB network as a quantifiable spectrum, producing a so-called “spectral model” connecting GB structure, chemistry, and properties. This talk will review what is now a complete first draft of the GB spectral model for GB chemistry in metal alloys, including all the thermodynamic elements needed to make predictions of GB configuration and energetics across the full span of an alloy phase diagram. Application to experiments, materials design, and commercialization of new alloys will be discussed. 2024 IMS Henry Clifton Sorby Lecture Tuesday, October 1 | 1:00 – 2:00 p.m. At IMAT in Cleveland Prof. Luiz Henrique de Almeida Professor, Federal University of Rio de Janeiro, Brazil “HP-Grade Heat Resistant Austenitic Stainless Steels: 30 Years of Microstructural Evolution and Significant Performance Increase for Hydrogen Production in Steam Reforming Furnaces” Since the 1990s, when HP-grade heat-resistant austenitic stainless steels began to be extensively used in the petrochemical industry, their in-service performance has increased significantly due to improvements in composition and microstructure design. For example, steam reforming furnaces for large-scale hydrogen production can now operate with larger loads at higher temperatures, circa 1000°C, without compromising the design criteria of a 100,000 hours service life. Currently, under these conditions, service times close to 200,000 hours are not uncommon. The effect of Nb, Ti, and Y additions, the fragmentation of the interdendritic primary carbide network, and the transformation of NbC to G-phase (Ni16Nb6Si7) during aging will be addressed. The effect of short time in-service overheating, promoting in situ G-phase dissolution and subsequent precipitation of small fragmented NbC particles upon cooling, will be characterized. Practical consequences of these transformations will be discussed based on the study of HP tubes decommissioned after 40,000 to 143,000 hours of operation. LECTURERS Schuh Henrique de Almeida Of cial ASM Annual Society Meeting Notice The Annual Society Meeting of members of ASM International will be held on: Monday, September 30 4:00 - 5:00 p.m. The purpose of the ASM Annual Society Meeting is the election of officers for the 2024-2025 term and transaction of other Society business. LEARN MORE The International Materials, Applications, & Technologies Conference and Exhibition runs September 30 through October 3 in Cleveland. To see the full IMAT technical program, visit asminternational.org/imat-2024.
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