| dc.description.abstract | Material issues are of paramount importance for the reliable and
cost effective operation of gas turbine engines. Because of the high
turbine temperatures, the materials degrade over time, which
requires their repair or replacement. Rapid degradation or the
inability to repair these complex materials result in excessively
high operating costs.
This paper concentrates upon the hot section components,
because this is where the majority of turbine distress occurs.
Superalloys, both nickel based and cobalt based, and high
temperature coatings are discussed from a user's perspective. The
degradation of the hot section components--combustor hardware,
blades, and vanes-is described. This degradation includes that
due to creep, thermal mechanical fatigue, high temperature
oxidation, and hot corrosion. Approaches to determining the
remaining life of these components is discussed, including the data
that the user must supply. A computer program for determining the
remaining life of the first stage blades and vanes is presented.
Finally, the repair and rejuvenation of the materials and
components are described, including heat treatment, welding,
brazing, and recoating. | en |
