San Francisco, California
London, United Kingdom
A historical perspective on the evolution of high-temperature materials and processing technologies for aircraft engines
Presented by Dr. Linruo Zhao
Registration 6:00 PM
Dinner 6:30 PM
Program 7:30 PM
“Over his existence man has developed equipment to satisfy his needs.” – Chester T. Sims, General Electric Company. Modern aircraft engines present some of the most challenging working environments for metallic materials – the temperature of combustion gas entering the turbine exceeds the melting point of the white hot rotating blade alloy! From the conception of high-temperature materials based on austenitic stainless steels in the 1930s to the latest generation of single crystal Ni-base superalloys used in Rolls-Royce Trent 1000 engines, we have come a long way as metallurgists to understand the science and master the art of crafting some of the best-behaved materials in the engineering field. In this talk the author will briefly walk the audience through a historical journey and make a few stops at such milestones as the discovery of the precipitation-hardening gamma prime phase in early 1940, the additions of refractory metals for solid solution strengthening of the gamma phase from late 1940s, the advent of vacuum melting of superalloys around 1950, the introduction of directional solidification process to produce columnar and single crystal airfoil components in the 1960s and 1970s, and the development of the fifth generation single crystal Ni-base superalloy in the 2000s. Furthermore, the application of thermal barrier coatings on internally cooled components in the 1970s has enabled engineers to design gas turbines with combustion gas temperatures exceeding the melting point of superalloys used in the engines. Looking at the horizon, the emergence of ceramic matrix composites is challenging the legitimacy of Ni-base superalloys in gas turbine engines to achieve still higher efficiencies.
Dr. Linruo Zhao is Principal Research Officer with the Aerospace Portfolio of the National Research Council of Canada. He earned his Ph.D. in Physical Metallurgy from Beijing Institute of Aeronautical Materials in 1988. After spending two years at the University of Manitoba as a postdoctoral fellow, Dr. Zhao joined the Institute for Aerospace Research of the NRC in 1991. His early work at the NRC concentrated on the processing, microstructure and mechanical properties of high-temperature materials for gas turbines. In the last 10-15 years, he focused most of his research on the design, fabrication and evaluation of protective coatings for aircraft engine components. Dr. Zhao has authored and co-authored more than 100 papers in scientific journals and conference proceedings. He joined ASM International in 1991 and has been active in serving his local Ottawa Valley Chapter. He currently is the vice-chair of ASM Canada Council.
When & Where
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