Creep Strength and Microstructure of AL20-25+Nb Alloy Sheets and Foils for Advanced Microturbine Recuperators

Maziasz, P.J.; Shingledecker, John; Evans, N. D.; Yamamoto, Yukinori; More, Karren L.; Trejo, Rosa M; Stinner, Charles P.

doi:10.1115/gt2006-90195

Cited by 3 publications

(3 citation statements)

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“…foil form is much shorter than that of the tube specimen. Maziasz et al [2005Maziasz et al [ , 2006 also observed such rapid creep rupture in foils of other alloys such as Alloy 625, and HR120. Figure 3.79 clearly suggests that it is critical to evaluate the mechanical properties, especially fatigue, creep and creep-fatigue, of thin sections (of the thickness typically used in PCHEs) of Alloy 617 and other candidate materials and establish the performance envelope.…”

Section: Thin-section Mechanical Properties Of Metallic Alloysmentioning

confidence: 91%

Preliminary issues associated with the next generation nuclear plant intermediate heat exchanger design.

Natesan¹,

Moisseytsev²,

Majumdar³

et al. 2007

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Executive SummaryThe Next Generation Nuclear Plant (NGNP), which is an advanced high temperature gas reactor (HTGR) concept with emphasis on production of both electricity and hydrogen, involves helium as the coolant and a closed-cycle gas turbine for power generation with a core outlet/gas turbine inlet temperature of 900-1000*C. In the indirect cycle system, an intermediate heat exchanger is used to transfer the heat from primary helium from the core to the secondary fluid, which can be helium, nitrogen/helium mixture, or a molten salt. The system concept for the vary high temperature reactor (VHTR) can be a reactor based on the prismatic block of the GT-MHR developed by a consortium led by General Atomics in the U.S. or based on the PBMR design developed by ESKOM of South Africa and British Nuclear Fuels of U.K.This report has made a preliminary assessment on the issues pertaining to the intermediate heat exchanger (IHX) for the NGNP. Two IHX designs namely, shell and tube and compact heat exchangers were considered in the assessment. Printed circuit heat exchanger, among various compact heat exchanger (HX) designs, was selected for the analysis. Irrespective of the design, the material considerations for the construction of the HX are essentially similar, except may be in the fabrication of the units. As a result, we have reviewed in detail the available information on material property data relevant for the construction of HX and made a preliminary assessment of several relevant factors to make a judicious selection of the material for the IHX.The assessment included four primary candidate alloys namely, Alloy 617 (UNS N06617), Alloy 230 (UNS N06230), Alloy 800H (UNS N08810), and Alloy X (UNS N06002) for the IHX. Some of the factors addressed in this report are the tensile, creep, fatigue, creep fatigue, toughness properties for the candidate alloys, thermal aging effects on the mechanical properties, American Society of Mechanical Engineers (ASME) Code compliance information, and performance of the alloys in helium containing a wide range of impurity concentrations.A detailed thermal hydraulic analysis, using a model developed at ANL, was performed to calculate heat transfer, temperature distribution, and pressure drop inside both printed circuit and shell-and-tube heat exchangers. The analysis included evaluation of the role of key process parameters, geometrical factors in HX designs, and material properties. Calculations were performed for helium-to-helium, helium-to-helium/nitrogen, and helium-to-salt HXs. The IHX being a high temperature component, probably needs to be designed using ASME Code Section III, Subsection NH, assuming that the IHX will be classified as a class 1 component. With input from thermal hydraulic calculations performed at ANL, thermal conduction and stress analyses for both compact and shell-and-tube HXs were performed.Several conclusions were drawn from this assessment:• In general, majority of materials research and development programs in support of HTGRs were conducted in the...

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Section: Thin-section Mechanical Properties Of Metallic Alloysmentioning

confidence: 91%

Preliminary issues associated with the next generation nuclear plant intermediate heat exchanger design.

Natesan¹,

Moisseytsev²,

Majumdar³

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Figure 8: LMP plot for 740H plate and tube specimens (aged for 16h at 800 °C in air) [37], 282 specimens (plate material) after aging for 4h at 800 °C in vacuum [30] and 625 sheet specimens (sheet material) in cold-rolled and annealed (1052 °C) condition for the Special Metals data, in as-received condition from ATI Allegheny Ludlum for ORNL data [38] and in solution annealed (1100°C) condition for the ANL data [39].…”

Section: Creep Datamentioning

confidence: 99%

“…Existing creep data for 625 sheet specimens generated at ORNL [38] and at ANL [39] was assimilated and the corresponding LMP plot for the data is shown in Figure 8. Additionally, data from the alloy manufacturer Special Metals was also included resulting in a dataset encompassing temperatures between 593-1000°C and stresses from 30-600 MPa.…”

Section: Creep Datamentioning

confidence: 99%