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New PDF release: Advanced [gas] Turbine System - Conceptual Design [final

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Extra info for Advanced [gas] Turbine System - Conceptual Design [final rpt]

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Strains were measured by linear-variable differential transducers attached to extensometers, which "touched on" to the testpiece gauge section and temperatures were measured by a thermocouple attached to the center of the testpiece by spring loading. In order to calibrate the equipment testpieces were heated to 400 C and to 1000 C and a small load was applied at each temperature to enable the elastic modulus to be determined. Similarly a full thermal cycle was applied and the strain due to thermal expansion was determined.

Experimental Materials and Testpieces The CMSX-4 alloy used in the test program was cast by Howmet Corporation as single crystal testpiece blanks with a crystal orientation nominally in the [001] direction along the axis of the bar. All testpiece blanks were heat treated in the standard "step-wise" procedure up to 1140 C and in all cases a “post-coating” heat treatment was performed at 1080 C for 4 h. Subsequently a precipitation heat treatment was carried out in vacuum at 871 C for 20h. Details of the compositions of the alloy and coatings are given in Table 1.

In addition, the morphology of cracking was different at the lower strain ranges. A somewhat larger coating depleted zone was observed with some crack branching in the coating, and a higher incidence of cracks penetrating into the substrate at an angle to the surface. In addition other small cracks were observed that did not penetrate and were blunted in the coating. Pt-Al In this case many of the secondary cracks did not penetrate through the coating but were blunted at the diffusion zone (Figure 20).

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Advanced [gas] Turbine System - Conceptual Design [final rpt]


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