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Effects of Some Solution Treatments Followed by an Aging Treatment on the Life of Small Cast Gas-turbine Blades of a Cobalt-chromium-base Alloy

其他書名	2 - Effect of Selected Combinations of Soaking Time, Temperature, and Cooling Rate
出版	National Advisory Committee for Aeronautics, 1951
URL	http://books.google.com.hk/books?id=R86eYgEACAAJ&hl=&source=gbs_api

註釋An investigation was conducted to determine the effects of a number of solution and aging treatments on the life of small cast gas-turbine blades of Haynes Stellite alloy 21 (a cobalt-chromium-base alloy). Solution treating at 2250 degrees F followed by slow furnace cooling and subsequent aging was found to improve the mean life an the initial failure time of the blades. The improvement was confirmed by statistical analysis. Metallographic examination revealed the presence of a lamellar structure in the improved blades. Other treatments investigated did not improve blade life. The blades were operated at 1500 degrees F and 20,000 pounds per square inch at the blade mid-span. Samples of 20 and 22 blades were used.