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Refractory creep properties

You may be wondering why we did not mention the pure refractory metals Nb, Ta, Mo, W in our chapter on turbine-blade materials (although we did show one of them on Fig. 20.7). These metals have very high melting temperatures, as shown, and should therefore have very good creep properties. [Pg.223]

Fig. 11.16 summarizes the creep properties of refractory alloys expressed by stress for 1% creep deformation in 10,000 h for Nb-lZr, Ta-8W-2Hf, TZM, W-25Re... [Pg.430]

Metal alloys that are especially resistant to creep have high elastic moduli and melting temperatures these include the superalloys, the stainless steels, and the refractory metals. Various processing techniqnes are employed to improve the creep properties of these materials. [Pg.289]

Thermomechanical properties, e.g. softening under load, creep in compression, refractoriness under load and thermal shock resistance. [Pg.370]

First, volatiles exert an important control on the physical properties of the mantle. For example, the presence of water reduces the strength of olivine aggregates and seriously alters the viscosity of the mantle. Experimental studies show that at 300 MPa, in the presence of water, the viscosity of olivine aggregates deformed in the dislocation creep regime is reduced by up to a factor of 140. Thus a wet mantle is a low viscosity mantle. Conversely a mantle that is dried out by partial melting will be stiffer and more refractory, as is the case for the lithospheric "lid" to modern oceanic mantle. Thus, if it is possible to estimate the volatile content of the mantle both now and in the Archaean, it will be possible to set some physical constraints on models of mantle evolution over time. [Pg.176]


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See also in sourсe #XX -- [ Pg.327 ]

See also in sourсe #XX -- [ Pg.327 ]




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Refractories, properties

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