Model austenitic alloys are being studied as part of an alloy development program for high temperature (≥650°C) recuperators for small gas turbine engines. In many cases, the recuperator design requires an alloy foil with both high temperature strength and corrosion resistance in an exhaust gas environment. Previous work showed that type 347 stainless steel would not have sufficient corrosion resistance for this application. Long-term testing is being conducted to better understand the effect of composition on corrosion resistance in humid air at 650°-800°C. Current results show that Fe-20Cr-20Ni with additions of Mn and Si has excellent corrosion resistance in humid air for more than 5,000h at 650° and 700°C. Increasing the Ni content of the alloy is critical to improving corrosion resistance.

Subject
Foil, Water, Materials, Corrosion resistant alloys, Stainless alloys, Materials performance, Nickel based alloys, Mass loss, Mass gain, Scale, Corrosion resistance, Stainless steel, Alloys
Keywords:
Stainless steel, gas turbines, recuperators, water vapor, alloy composition
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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