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By D Gandy; J Shingledecker; Ramaswamy Viswanathan; Electric Power Research Institute.; et al

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Read or Download Advances in materials technology for fossil power plants : proceedings from the sixth International Conference, August 31-September 3, 2010, Santa Fe, New Mexico, USA PDF

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Extra info for Advances in materials technology for fossil power plants : proceedings from the sixth International Conference, August 31-September 3, 2010, Santa Fe, New Mexico, USA

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Fig. 4 Effect of nitrogen on creep properties of B-added 9Cr steel Fig. 5 Creep life vs. heating temperature relationship for FG HAZ and HAZ with memory effect 16 The foregoing observations reflect the results of laboratory research, but developed steels must conform to the composition ranges of specification, meaning that there are strict limitations on chemical composition and heat treatment conditions in the context of expressing desired creep strength. At the same time, since creep strength is affected by microstructural considerations having to do with chemical composition, heat treatment conditions, and constituents, even steels that conform to the specified compositional ranges are slightly different in each heat, exhibiting some variation.

7). At the very early stage of 650°C aging for 1-5h TEM images can not clearly show the existence of Cu-rich phase because of its extremely fine particle sizes. 250 Microhardness /HV 240 230 220 210 200 190 180 0 250 500 750 1000 t /h Figure 6. Typical precipitation hardening curve of Super 304H at 650°C aging till 1,000h 38 (a) (b) Intensity Cu Fe Cr Cr Cu 100nm 0 2 4 6 Cu Ni 8 10 12 keV Figure 7. Cu-rich phase precipitates in Super 304H after 650°C aging for 1,000h (a) and EDAX analyses on Cu-rich phase Three dimensional atomic probe (3DAP) analyses show that Cu atom segregated regions (Curich clusters) have been clearly shown just after 650°C /5h aging as a typical example (see Fig.

Nevertheless, the results indicate that positron life increased. This is thought to represent the precipitation of very fine MX during transition creep accompanying with the decrease in dislocation density. Long-term Creep Strength and Life Prediction Technology. The time-temperature parameter (TTP) method is generally used to accurately predict creep rupture strength at 100,000h required to determine design stress from short-term data. Particularly in the case of creep strength enhanced ferritic steels, discontinuous sudden drop of strength is known to occur on the high temperature and long-term side of the stress - time to rupture diagram.

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