Community Research and Development Information Service - CORDIS

Abstract

The two dominant technologies in power engineering are steam and gas turbines. These are, however, dependent on a prior stage of combustion and, perhaps, gasification. There is a continuous drive towards higher operating efficiencies and greater reliability of the units. This leads to a need for larger components to operate at higher temperatures and pressures and hence under more arduous conditions of mechanical and corrosive loading, for times which may exceed 200,000 h (30 years). Some examples are used to illustrate generic features of the materials problems towards which research and development is aimed. In some components the high temperature time-dependent mechancial properties dominate, a good example being gas turbine blades. Uniformity of the time-dependent mechanical properties plus fracture toughness is difficult to attain in the very large forgings required for steam turbines. Within the heat generation units (boiler tubes, headers, etc.) the mechanical requirements are severe, but would not be critical without the constraints imposed by the need for inexpensive corrosion and erosion resistance.

Additional information

Authors: MARRIOTT J B, JRC Petten (NL)
Bibliographic Reference: Article: High Temperature Technology, Vol. 7 (1989) No. 3, pp. 129-135
Record Number: 199011276 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en