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- W2022794602 abstract "A new conceptual framework involving an integrated approach to materials development, component design and life prediction for high-temperature applications is outlined. Termed ‘Design for Performance’, this provides an alternative to the traditional approach which requires the creep to rupture testing of many specimens over long periods. Accelerated development of new alloys for higher-temperature turbine blades and discs, and assessment of remaining life of operating components, is now possible. The tests described are a refined stress relaxation test — from which extensive stress versus strain-rate data may be generated over a range of temperatures — and a constant displacement rate crack growth test. These tests provide a separation of the creep strength and fracture resistance criteria required in design. Extensive studies on the cast alloy IN738 have shown that the creep strength is quite insensitive to prior exposure and microstructure, but fracture resistance is very sensitive to thermal history. Relative to the standard heat treatment, fracture resistance can be seriously impaired or substantially improved. It is also shown that calibration with traditional design methods for creep strength is possible. Once minimum performance standards have been established for the original design, these may be used as a basis for life management. For example, decisions regarding component replacement, repair or refurbishment may be made as one or more of these minimum performance standards are approached during service. Thus, the methodology provides a consistent basis for life management for both new and serviced components. It is argued that not only is this approach much faster, more efficient and less costly, but that the framework on which it is based is technically superior to the traditional approach." @default.
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- W2022794602 title "Test methods for accelerated development, design and life assessment of high-temperature materials" @default.
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- W2022794602 doi "https://doi.org/10.1016/0261-3069(93)90077-9" @default.
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