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TECHNICAL PAPERS: Gas Turbines: Vehicular and Small Turbomachines

Selecting and Developing Advanced Alloys for Creep-Resistance for Microturbine Recuperator Applications

[+] Author and Article Information
P. J. Maziasz, R. W. Swindeman

Metals and Ceramics Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6115

J. Eng. Gas Turbines Power 125(1), 310-315 (Dec 27, 2002) (6 pages) doi:10.1115/1.1499729 History: Received December 01, 2000; Revised March 01, 2001; Online December 27, 2002
Copyright © 2003 by ASME
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References

Figures

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TEM images showing the microstructures within grains and along grain boundaries for as-processed foils of (a) alloy 214 with a final solution anneal (SA) of 30s at 1100°C, and (b) alloy 625 (FG) with a final recrystallization anneal of 30s at 900°C. The superimposed diffraction pattern shows the characteristic extra spots from the γ(Ni3Al) coherent precipitates shown as black spots in the image. The alloy 625 had coarser precipitate particles of Ti and Nb-rich MC carbides and finer η phase silicides.
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Plots of creep strain versus time for creep-rupture testing at 800°C and 80 MPa of foils of alloy 214 processed at different conditions that slightly vary final grain size, with 2s at 1150°C being finer
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Plots of creep strain versus time for creep-rupture testing at 750°C and 100 MPa of foils of alloy 625 processed at different conditions (FG = fine grained) or with 2.5% cold prestrain
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Plots of creep strain versus time for creep-rupture testing of foils ranging from type 347 stainless steel to alloys 625 and 214 at 750°C and 100 MPa
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Plots of creep strain versus time for creep-rupture testing of foils ranging from type 347 stainless steel to alloy 740 (formerly thermie alloy) at 750°C and 100 MPa
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Optical metallography of polished and etched specimens of as-processed 0.1-mm thick foils to show grain sizes of (a) type 347 stainless steel, (b) alloy 740 (formerly thermie-alloy), and (c) alloy 214

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