Creep-Fatigue of Advanced Austenitic Alloys

Carroll, Laura; Benz, Julian; Wright, Richard N.

doi:10.2172/993156

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…The data is considered "trend" because failure occurred opposite the upper extensometer contact point. 3 It is unclear whether these creep-fatigue results are representative and the result of larger isolated grains, shown in Figure 1(a). Evidence of enlarged, isolated grains near a surface crack are shown in Figure 10(a).…”

Section: Microstructure Effect On Creep-fatiguementioning

confidence: 95%

“…The majority of the Alloy 709 cyclic test data was reported previously in milestone reports. [1][2][3][4] The microstructural and processing details for the specific heats were reported by Yamamoto et al 5 8 This summary report includes creep-fatigue test results on three additional heats (Specimens referred to as F2, H2, and 539).…”

Section: Microstructural Effects On Creep-fatigue Life Of Alloy 709 1 Introductionmentioning

confidence: 99%

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Microstructural Effects on Creep-Fatigue Life of Alloy 709

McMurtrey

Carroll

Wright

2017

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Creep-fatigue tests were performed on plates of Alloy 709 from various heats and processing conditions, but often with inhomogeneous microstructures. After testing, metallographic analysis was performed and the specimens were generally found to either have a uniform grain size or a bimodal grain size distribution with either isolated or groups (bands) of large grains. Creep-fatigue life was characterized with respect to the length of the grain boundary perpendicular to the stress axis, and it was found that large grains (>400 µm) tended to be detrimental to creep-fatigue life, with the exception of elongated (parallel to the stress axis) grains and some specimens that underwent additional annealing.

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Section: Microstructure Effect On Creep-fatiguementioning

confidence: 95%

Section: Microstructural Effects On Creep-fatigue Life Of Alloy 709 1 Introductionmentioning

confidence: 99%

Microstructural Effects on Creep-Fatigue Life of Alloy 709

McMurtrey

Carroll

Wright

2017

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“…The creep-fatigue test procedure (Carroll, et al 2010) There are three Excel files associated with each experiment. The specimen.xls file contains detailed data for a limited number of stress-strain cycles.…”

Section: Creep-fatigue Testsmentioning

confidence: 99%

“…Creep-Fatigue tests are governed by the creep-fatigue test procedure (Carroll, et al, 2010) and the extensometer calibration procedure (Lloyd, et al, 2009). Accuracy tests are currently in development for the creep-fatigue data.…”

Section: Htm Data Qa Documentationmentioning

confidence: 99%

High Temperature Materials Interim Data Qualification Report

Lybeck¹

2010

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Projects for the very high temperature reactor (VHTR) Technology Development Office provide data in support of Nuclear Regulatory Commission licensing of the VHTR. Fuel and materials to be used in the reactor are tested and characterized to quantify performance in high temperature and high fluence environments. The VHTR program has established the Next Generation Nuclear Plant (NGNP) Data Management and Analysis System (NDMAS) to ensure that VHTR data are qualified for use, stored in a readily accessible electronic form, and analyzed to extract useful results.

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“…Following the down selection to Alloy 709, a number of laboratory-scale heats of the alloy were made to refine processing conditions and heat treatments to obtain the desired hightemperature mechanical properties. 2,3,4,5,6,7,8,9 Based on these results, an industrial-scale heat of Alloy 709 was commissioned from G.O. Carlson.…”

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confidence: 99%

Report on the FY18 creep rupture and creep-fatigue tests on the first commercial heat of Alloy 709

McMurtrey

2018

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Creep, fatigue, and creep-fatigue tests were performed on the commercial scale G.O. Carlson plate of Alloy 709 (ID 58776-4). The Alloy 709 heat was first processed using the argon oxygen decarburization process (AOD). A portion of the heat was then refined using electro-slag remelting (ESR). Finally, a portion of the ESR ingot underwent a homogenization heat treatment (ESR+HOMO). The three ingots were hot rolled into plates and each was further divided into three sections for different solution annealing temperatures (1050, 1100 and 1150°C). The effects of processing method and solution annealing temperature were studied in FY-18 to inform best procedures for the second heat. The solution annealing temperature of 1050°C was found to be unacceptable due to the grain size being smaller than allowed by the specifications. This material also had generally poor creep properties. Annealing at 1100 and 1150°C resulted in material with grain size that met the specifications. Both argon oxygen decarburization and electro-slag remelting were found to have desirable properties, and the homogenization heat treatment was found not significantly to improve mechanical properties.

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Creep-Fatigue of Advanced Austenitic Alloys

Cited by 3 publications

References 5 publications

Microstructural Effects on Creep-Fatigue Life of Alloy 709

Microstructural Effects on Creep-Fatigue Life of Alloy 709

High Temperature Materials Interim Data Qualification Report

Report on the FY18 creep rupture and creep-fatigue tests on the first commercial heat of Alloy 709

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