Abstract:A semi-industrial scale rolled bar of the creep resistant Ni base superalloy designed in Parts 1 and 2 has been fabricated. The in¯uence of heat treatment on microstructure and phase formation has been investigated using both optical and electron microscopy, and X-ray diffraction. Mechanical properties at ambient and high temperature have been measured by hardness testing, compression testing, and tensile creep testing. These experimental results are in good agreement with the predictions of Parts 1 and 2 conc… Show more
“…9(a)) and high temperature strength ( Fig. 9(b)) [13]. The main problems with Ni-base alloys would be the radiation embrittlement, swelling and phase instability under neutron radiation environment.…”
“…9(a)) and high temperature strength ( Fig. 9(b)) [13]. The main problems with Ni-base alloys would be the radiation embrittlement, swelling and phase instability under neutron radiation environment.…”
“…This of course is a major reason why austenitic stainless steels cannot be used with vengeance in the construction of efficient steam turbines. [17][18][19] The much higher thermal expansivity of the austenite when compared with ferrite gives rise to thermal fatigue. The higher creep strength of the austenite cannot therefore be exploited so we are stuck with steam temperatures of about 620uC unless other much more expensive materials are used in place of steel.…”
“…Conversely, the new model takes into account γ′ grain boundary pinning (open squares in Fig. 1) and describes well the experimental data with a value of β γ′ = 0.30 μm, and an estimated precipitate size of 100 nm; this is a typical size in superalloys with a moderate volume fraction of γ′ [36], which will be used throughout this work. Nevertheless, according to Eqs.…”
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