By D Gandy; J Shingledecker; Ramaswamy Viswanathan; Electric Power Research Institute.; et al
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Extra 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
Y. Hasegawa, M. Sugiyama and K. Kawakami, “Type IV Damage Mechanism due to the Microstructure Weakening in the HAZ of a Multi-Layer Welded Joint of the W Containing 9%Cr Ferritic Creep Resistant Steel”, Proc. ECCC Creep Conference, (2009), 995-1006. 8. T. Tokunaga, K. Yoshida, M. Sakanaba and F. Masuyama, “Effect of Alloying Elements and Compositional Phases on Long-Term Creep Strength of Modified 9Cr-1Mo Steel”, to be presented at 9th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium, Sept.
Fig. 12 Microstructures of fusion area in liquid phase diffusion welded joint of Ni-based alloy fabricated with pressing load varied Creating welded joints from Ni-based alloys can be difficult due to the likelihood of hot tearing in weld metal and fusion zone. In this project, then, liquid phase diffusion welding was used for joint fabrication. Joining temperature of over 1200°C with holding time of over 10 min is optimal for the developed alloy under consideration, and it was confirmed that pressing load of 10MPa would be required.
21) remind us that the γ′ strengthening phase is relatively stable and uniformly distributed in γ-matrix. However there are tremendous changes at grain boundaries. Firstly the grain boundary precipitates increase and the blocky particles (G phase) and also needle-like precipitation (η phase) have formed mainly at grain boundaries. 1100 Temperature / C 600000 o 3 r¯ / nm 3 o 760 C 500000 400000 300000 200000 o 725 C 100000 704 C 0 500 η 1000 950 900 850 800 750 o 0 1050 700 1000 1500 2000 2500 3000 3500 4000 4500 t/h 10 100 1000 10000 Time / hours Figure 22.