Download Advances in materials technology for fossil power plants : by D Gandy; J Shingledecker; Ramaswamy Viswanathan; Electric PDF

April 11, 2017 | Technology | By admin | 0 Comments

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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Additional resources 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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G phase is A6B16Si7-type high Si-content phase (Nb, Ti)6(Ni, Co)16Si7. Quantitative phase analyses results (see Table. 8) show that the fraction of G phase for INCONEL 740 aged at 760℃ are much more higher than those of at 704℃. 471 Above mentioned results show that main structure instabities of INCONEL 740 above 750°C aging are rapid coarsening of γ′, η phase transformation and a certain amount of G phase formation at grain boundaries. The structure stability improvements were based on phase calculation by Thermo-Calc software for adjustment of γ′ solvus to a higher temperature and higher fraction of γ′ for higher strength at higher temperature.

In creep strength enhanced ferritic steels, growth Fig. 6 Relationship between creep rupture strength and chemical content in matrix and precipitates 17 of the martensite lath structure occurs due to coarsening of M23C6 precipitated at the grain boundaries, accompanying the progress of creep. However, it is considered that higher creep rupture strength is demonstrated as a result of the suppression of precipitates coarsening due to greater solid solution of Mo in M23C6 than in the matrix. With respect to the reduction of creep strength in the HAZ of creep strength enhanced ferritic steels, given that material properties change over very small areas, it can be extremely difficult to conduct material characterization and strength measurement.

TEM images of Super 304H after 650℃/5,000h aging Average Diameter Fitting curve 35 30 25 20 15 10 5 0 0 2000 4000 6000 8000 10000 Aging time at 650℃ /h Figure 11. The growth tendency of Cu-rich phase at 650℃ long time aging till 10,000h 41 200nm Figure 12. 4% Al for γ’–Ni3(Nb, Ti, Al) precipitation strengthening high temperature material, which was invented by Institute of Metal Research, Chinese Academy of Sciences[7]. The purpose of GH2984 development was to fulfill superheater tube application at 700°C for marine power.

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