Fatigue strength of spot welded beams in high strength steels : Lindgren, C., Sperle, J.O. and Jonsson, M. Welding in the World (1996) 37 (2), 90–104
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文摘
The development of future generations of jet engines as aerospace power plants would not be possible without their use of high-performance coatings. Such coatings must be capable of resisting the highly demanding mechanical and thermal stresses to which they are subjected. The prime consideration, in addition to their optimal constructive use, is the functionality of the material surface. The demands made on the surfacing material are often very different from those placed on the substrate itself. The latter are selected on the basis of their mechanical strength and their creep resistance at elevated temperatures. By contrast, the surfaces must be erosion and oxidation resistant. These combined demands can only be met by customized substrate-coating combinations. In addition, coatings must be fatigue-resistant and must have no negative effects on the substrate properties. The scope for utilization and protective capacity of various protective systems is here described, under the headings: fibre-reinforced polymer composites, titanium alloys and titanium aluminide, Ni alloys and nickel aluminide, monolithic and fibre-reinforced ceramics, silicides and niobium alloys.