Creep strength and microstructure of AL20-25+ Nb alloy sheets and foils for advanced microturbine recuperators

P. J. Maziasz; J. P. Shingledecker; N. D. Evans; Y. Yamamoto; K. L. More; R. Trejo; E. Lara-Curzio

doi:10.1115/1.2718569

Creep strength and microstructure of AL20-25+ Nb alloy sheets and foils for advanced microturbine recuperators

P. J. Maziasz, J. P. Shingledecker, N. D. Evans, Y. Yamamoto, K. L. More, R. Trejo, E. Lara-Curzio

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Abstract

The Oak Ridge National Laboratory (ORNL) and ATI Allegheny Ludlum worked together on a collaborative program for about two years to produce a wide range of commercial sheets and foils of the new AL20-25 + Nb™ (AL20-25 +Nb) stainless alloy for advanced microturbine recuperator applications. There is a need for cost-effective sheets/foils with more performance and reliability at 650-750°C than 347 stainless steel, particularly for larger 200-250 kW microturbines. Phase 1 of this collaborative program produced the sheets and foils needed for manufacturing brazed plated-fin air cells, while Phase 2 provided foils for primary surface air cells, and did experiments on modified processing designed to change the microstructure of sheets and foils for improved creep-resistance. Phase 1 sheets and foils of AL20-25 +Nb have much more creep-resistance than 347 steel at 700-750°C, and those foils are slightly stronger than HR120 and HR230. Results for Phase 2 showed nearly double the creep-rupture life of sheets at 750°C/100 MPa, and similar improvements in foils. Creep data show that Phase 2 foils of AL20-25 +Nb alloy have creep resistance approaching that of alloy 625 foils. Testing at about 750°C in flowing turbine exhaust gas for 500 h in the ORNL Recuperator Test Facility shows that foils of AL20-25 +Nb alloy have oxidation-resistance similar to HR120 alloy, and much better than 347 steel.

Original language	English
Pages (from-to)	798-805
Number of pages	8
Journal	Journal of Engineering for Gas Turbines and Power
Volume	129
Issue number	3
DOIs	https://doi.org/10.1115/1.2718569
State	Published - Jul 2007

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title = "Creep strength and microstructure of AL20-25+ Nb alloy sheets and foils for advanced microturbine recuperators",

abstract = "The Oak Ridge National Laboratory (ORNL) and ATI Allegheny Ludlum worked together on a collaborative program for about two years to produce a wide range of commercial sheets and foils of the new AL20-25 + Nb{\texttrademark} (AL20-25 +Nb) stainless alloy for advanced microturbine recuperator applications. There is a need for cost-effective sheets/foils with more performance and reliability at 650-750°C than 347 stainless steel, particularly for larger 200-250 kW microturbines. Phase 1 of this collaborative program produced the sheets and foils needed for manufacturing brazed plated-fin air cells, while Phase 2 provided foils for primary surface air cells, and did experiments on modified processing designed to change the microstructure of sheets and foils for improved creep-resistance. Phase 1 sheets and foils of AL20-25 +Nb have much more creep-resistance than 347 steel at 700-750°C, and those foils are slightly stronger than HR120 and HR230. Results for Phase 2 showed nearly double the creep-rupture life of sheets at 750°C/100 MPa, and similar improvements in foils. Creep data show that Phase 2 foils of AL20-25 +Nb alloy have creep resistance approaching that of alloy 625 foils. Testing at about 750°C in flowing turbine exhaust gas for 500 h in the ORNL Recuperator Test Facility shows that foils of AL20-25 +Nb alloy have oxidation-resistance similar to HR120 alloy, and much better than 347 steel.",

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AU - More, K. L.

AU - Trejo, R.

AU - Lara-Curzio, E.

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Creep strength and microstructure of AL20-25+ Nb alloy sheets and foils for advanced microturbine recuperators

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