High temperature environmental effects on metalsThe current status of knowledge and ability to predict high-temperature environmental attack of metals is reviewed with particular reference to the gas turbine engine. Environmental attack is caused by high temperatures, combustion products, and impurities. A schematic representation of life-limiting factors of turbine components shows that environmental attack can lead to very early failures. Attention is given to high-temperature oxidation with prevailing modes of oxidation attack, and to hot corrosion and other impurity effects. Erosion attack results from the direct mechanical removal of component material by impact of hard substances like ash, sand, or dirt. Solutions to hot-corrosion problems can be found semiempirically by using improved alloys or ceramics, protective surface coatings, additives to the engine environment, and air/fuel cleanup to eliminate detrimental impurities.
Document ID
19780045420
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Grisaffe, S. J. (NASA Lewis Research Center Cleveland, OH, United States)
Lowell, C. E. (NASA Lewis Research Center Cleveland, OH, United States)
Stearns, C. A. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1977
Subject Category
Metallic Materials
Meeting Information
Meeting: Sagamore Army Materials Research Conference on Risk and Failure Analysis for Reliability