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Mechanical properties from an advanced, nickel-base superalloy disk, with a dual grain structure consisting of a fine grain bore and coarse grain rim, were evaluated. The dual grain structure was produced using NASA's low cost Dual Microstructure Heat Treatment (DMHT) process. The results showed the DMHT disk to have a high strength, fatigue resistant bore comparable to a subsolvus (fine grain) heat treated disk, and a creep resistant rim comparable to a supersolvus (coarse grain) heat treated disk. Additional work on subsolvus solutioning before or after the DMHT conversion appears to be a viable avenue for further improvement in disk properties. Gayda, John and Gabb, Timothy and Kantzos, Peter Glenn Research Center NASA/TM-2003-212181, NAS 1.15:212181, E-13782
A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength at high temperatures. Superalloy development has been driven primarily by the aerospace and power industries. This compilation of papers from the Twelfth International Symposium on Superalloys, held from September 9-13, 2012, offers the most recent technical information on this class of materials.
The papers collected in this special issue clearly reflect the modern research trends in materials science. These fields of specific attention are high-Mn TWIP steels, high-Cr heat resistant steels, aluminum alloys, ultrafine grained materials including those developed by severe plastic deformation, and high-entropy alloys. The major portion of the collected papers is focused on the mechanisms of microstructure evolution and the mechanical properties of metallic materials subjected to various thermo-mechanical, deformation or heat treatments. Another large portion of the studies is aimed on the elaboration of alloying design of advanced steels and alloys. The changes in phase content, transformation and particle precipitation and their effect on the properties are also broadly presented in this collection, including the microstructure/property changes caused by irradiation.
A comprehensive review of the latest developments in the pursuit of superalloys.
Materials science and engineering professionals from around the world gathered at the TMS 2011 Annual Meeting & Exhibition to network, present the latest research and industrial applications, and collaborate on ways to further innovation and advancement in the field. The meeting featured more than 70 symposia and some 3,000 presentations. The Supplemental TMS 2011 Proceedings collect some of the most important papers presented at the meeting, giving readers the opportunity to benefit from the latest discoveries in mineral, metals, and materials research. Topics cover everything from minerals processing and primary metals production to basic research and advanced materials applications. Moreover, you'll learn about the latest research efforts within the industry to develop sustainable, environmentally friendly products and processes.