ultrasuperciritical steam corrosion

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ultrasuperciritical steam corrosion

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Efficiency increases in fossil energy boilers and steam turbines are being achieved by increasing the
temperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
increases, advanced materials are needed that are able to withstand the higher temperatures and
pressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
6 Z; g9 k: n+ h* M6 M6 _# Z3 o- tthe Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical
7 L9 u/ f% ^7 o(USC) steam turbine applications. Initial tests are being done on six alloys identified as
candidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the
1 u) u, x! Z0 R+ V( l8 ?0 rhigh Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
! b# Z3 n/ c, h3 l7 P% c  [740. Each of these alloys has very high strength for its alloy type. Three types of experiments are
/ M' t4 w  o5 o. B3 Jplanned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
in steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and
34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
+ N$ |' ^1 p, {5 q+ k20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
of pressure on the oxidation process.