Date: Tuesday, October 1, 2019
Time: 8:00 a.m. to 10:40 a.m.
Three prestigious, invited presenters will deliver lectures during the all-conference plenary session on Tuesday morning. Come to learn more from these influential leaders in their fields.
TMS/ASM DISTINGUISHED LECTURESHIP IN MATERIALS AND SOCIETY
Presenter: Carolyn Hansson, Professor of Materials Engineering, University of Waterloo, Canada
Presentation Title: "The Challenge of 100 Year Service-life Requirement"
About the Presentation: The highway authorities in Canada and the U.S. are considering raising the service-life specification for reinforced concrete highway infrastructure from the current 75 years to 100 years or more. The goals are to reduce the financial and environmental costs and improve the sustainability of the system by limiting the need for maintenance, remediation, and replacement of the structures. In coastal areas and in the northern parts of North America and Europe, the major culprit in limiting the durability of reinforced concrete is salt from seawater and de-icing agents. The chlorides destroy the natural passivity of reinforcing steel in concrete and allow active corrosion, which eventually causes cracking and spalling of the concrete. De-icing agents containing calcium- or magnesium-chloride, can attack the concrete directly. This presentation will describe the research at Waterloo on identifying the most appropriate stainless steels to combat the chloride attack over the long term.
ACerS EDWARD ORTON JR. MEMORIAL LECTURE
Presenter: Minoru Tomozawa, Professor, Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, USA
Presentation Title: "Glass and Water: Fast Surface Relaxation"
About the Presentation: Water has large influence on various glass properties such as mechanical, optical, and chemical properties. Mechanical strength of glasses decreases in water or water vapor; the strength decreases with increasing loading time and crack growth rate increases in increasing water vapor. Structure and properties of glass can change with time near the glass transition temperature. This time dependence is a unique characteristic of glasses, called “relaxation,” and its speed increases with increasing temperature. In the presence of water vapor, it was discovered that the relaxation of surface layer of glasses becomes much faster than that of the bulk relaxation. Correspondingly, the surface relaxation was observed at a temperature much lower than the glass transition temperature. In this talk, this newly discovered phenomena will be discussed: the method of the measurement of surface relaxation method, its structural origin, its application to make stronger glass fibers, and its use to explain long standing mysteries related to mechanical properties of glasses, such as degradation of strengthened glasses, glass toughening, and fatigue limit.
AIST ADOLF MARTENS MEMORIAL STEEL LECTURE
Presenter: Wolfgang Bleck, Chair, Department of Ferrous Metallurgy, IEHK Steel Institute, RWTH Aachen University, Germany
Presentation Title: "The Fascinating Variety of New Manganese Alloyed Steels"
About the Presentation: The alloying element manganese is used in virtually all steels for enabling hot formability, to increase hardenability or for solid solution strengthening. Optimizing the balance of conflictive mechanical properties like strength, toughness, and fatigue, formability is the key issue of current steel and process development. Therefore, new steel design concepts use manganese for stabilizing the fcc phase and for adjusting the stacking fault energy. By this, phenomena such as the TRIP, TWIP, or MBIP effects are triggered. This interest in stress-controlled or strain-induced low temperature transformations of the austenite provides the basis for new steel groups like the advanced high strength steels (AHSS), which are of prime interest for sheet metal forming but also for new forging steel concepts. In medium and high manganese alloyed steels, new alloying concepts and new complex temperature-time-cycles during annealing have been combined for developing nanostructured matrices. A specific feature of these new materials is that by element partitioning on the nm-scale, local enrichments of carbon and manganese can lead to a complex interplay of phases and crystal defects, providing a new promising field for future materials and process development. The strong interaction of alloying elements among themselves as well as with various crystal defects are regarded as major parameters for the control of mechanical properties. Thus, developing these new steels requires the use of the latest analytical techniques, modern microstructural description methods, advanced simulation techniques, and thorough evaluation of the local and global mechanical behavior. The talk will provide examples of recent steel and process design with a focus on automotive car body and drive train applications.