The Role of Eta Phase Formation on the Creep Strength and Ductility of INCONEL Alloy 740 at 1023 K (750 °C)

Shingledecker, John; Pharr, George M.

doi:10.1007/s11661-011-1013-4

Cited by 95 publications

(41 citation statements)

References 15 publications

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“…An updated summary of the 650-800°C creep-rupture results for aged Inconel 740 and 740H, building on data previously reported, [9,12,13] is shown in Figure 1. Ongoing tests at 750°C include one that has reached ~48,000 h, portending continued extrapolation of the current trend to extended times.…”

Section: Resultsmentioning

confidence: 94%

“…This mechanical behavior effort has produced creep data for an ASME pressure vessel and piping code case for Inconel 740 [10] as well as creep-rupture results for other high-temperature alloys. [2,6] This paper updates the Inconel 740 creep and microstructure datasets previously reported [9,10,[11][12][13] as well as a smaller set of data for Haynes 282. [13] As a first step in assessing lifetime prediction methodologies, the experimental data are used to predict stresses at which 100,000-h creeprupture times should be achieved for the two alloy systems using and comparing Larson-Miller parameter projections and a modified power-law model.…”

Section: Introductionmentioning

confidence: 85%

“…Details of the test procedure can be found elsewhere. [12] For most tests, creep deformation was measured as a function of time using extensometers, but only times to rupture are reported in this paper. After testing, a subset of the creep specimens was used for microstructural analysis, which included optical imaging and scanning electron microscopy using a Hitachi model S4800.…”

Section: Methodsmentioning

confidence: 99%

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Long-Term Creep-Rupture Behavior of Inconel® 740 and Haynes® 282

Tortorelli

Wang

Unocic

et al. 2014

ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries

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Creep testing and microstructural analysis were used to assess the properties and time-dependent deformation behavior of precipitation-strengthened nickel-based alloys, specifically, Inconel hours based on experimental data out to almost 50,000 h was evaluated for these alloys.Even under conservative conditions, both Inconel alloy 740 and Haynes 282 project to have creep lifetimes exceeding 100,000 hours at 750°C and 100 MPa. INTRODUCTIONFor structural applications where lifetimes on the order of 10 years or more are required, there historically has always been the challenge of predicting times to failure (whether by creep, fatigue, corrosion, etc.) that exceed laboratory testing times by factors of 10-100X. Established procedures are in place for dealing with some of these behaviors (cf. the ASME pressure vessel and piping code cases), but, until recently, relatively little attention in this regard has been paid to nickelbased alloys and, in particular, those that achieve the highest levels of strength and creep resistance by precipitation strengthening. Indeed, in a recent review, Evans noted that improvements in life prediction approaches for traditional boiler steels need to be extended to this class of alloys, with particular reference to Inconel 740 and Haynes 282. [1] The main reason for interest in the behavior of nickelbased alloys for elevated-temperature, high-pressure, very long lifetime applications is the world-wide interest in improving the energy conversion efficiency of fossil-fueled power plants operating on steam cycles.[2-6] To achieve substantial increases in efficiencies, advanced ultrasupercritical (A-USC) steam conditions are needed, requiring alloys that will maintain

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

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Long-Term Creep-Rupture Behavior of Inconel® 740 and Haynes® 282

Tortorelli

Wang

Unocic

et al. 2014

ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries

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“…Creep-rupture testing has surpassed 45,000 hours without a marked drop-off in rupture strength or ductility as has been identified in some advanced ferritic and stainless steels. Research has included studies on notch sensitivity and microstructural development which suggest the alloy is suitable for long-term service at A-USC conditions [9,10]. Beyond code acceptance of materials, some other major highlights from the program include [11]:  In boiler testing using air cooled probes and two steam loops including the world's first steam loop to operate at 760°C for over 2 years without any major fireside corrosion or steam-side oxidation challenges.…”

Section: Advancements In High Temperature Structural Alloys In Convenmentioning

confidence: 99%

Concentrating solar power (CSP) power cycle improvements through application of advanced materials

Siefert

Libby

Shingledecker

2016

AIP Conference Proceedings

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Abstract. Concentrating solar power (CSP) systems with thermal energy storage (TES) capability offer unique advantages to other renewable energy technologies in that solar radiation can be captured and stored for utilization when the sun is not shining. This makes the technology attractive as a dispatchable resource, and as such the Electric Power Research Institute (EPRI) has been engaged in research and development activities to understand and track the technology, identify key technical challenges, and enable improvements to meet future cost and performance targets to enable greater adoption of this carbon-free energy resource. EPRI is also involved with technically leading a consortium of manufacturers, government labs, and research organizations to enable the next generation of fossil fired power plants with advanced ultrasupercritical (A-USC) steam temperatures up to 760°C (1400°F). Materials are a key enabling technology for both of these seemingly opposed systems. This paper discusses how major strides in structural materials for A-USC fossil fired power plants may be translated into improved CSP systems which meet target requirements. REVIEW OF STATE-OF-THE-ART CSP SYSTEMSIn 2014, EPRI completed a comprehensive review of molten salt as a heat transfer fluid and TES media for CSP applications [1]. Molten salt is used as a thermal energy storage media in over 25 parabolic trough plants, which use synthetic oil as the heat transfer fluid. The temperature of the salt is roughly 370°C (700°F), limited by the oil maximum operating temperature. In central receiver plants molten salt may be used in a direct configuration as both a heat transfer fluid and a storage fluid (Fig. 1). The molten salt is heated to 565°C (1050°F) in the receiver and then flows through a heat exchanger to produce steam for a conventional Rankine steam cycle. Two large-scale direct molten salt central receiver plants are currently in operation. Molten salt must always be maintained above its freeze temperature of 238°C (460°F) to avoid solidification in piping and other components. Both parabolic trough and central receiver CSP technologies typically employ a binary molten salt mixture (60 wt.% NaNO 3 and 40 wt.% KNO 3 ) because it offers an optimal balance of performance and cost relative to other salt compositions. Novel molten salt formulations, high temperature receivers using fluids such as supercritical CO 2 , solid particles and air, as well as advanced storage system designs are being explored in ongoing research by EPRI and others. Heat transfer fluids and storage media with wider temperature ranges than binary molten salt could make the value proposition for CSP with TES even stronger. For molten salt systems, materials of construction that can withstand corrosion above 600°C (1110°F) are a barrier to achieving higher thermodynamic cycle efficiencies. Today, traditional 300 series stainless steels are the workhorse of commercial CSP plants due to their superior corrosion behavior over traditional chromium molybdenum (CrMo) ste...

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“…8) In these alloys, the change in γ phase morphology during creep deformation, called rafting, strongly affects the creep strength. [9][10][11] Polycrystalline Ni-based heat-resistant alloys, such as Alloy 617, 12) Alloy 740, 13) and HR6W, 14) are expected to be used for boiler tubes and pipes. In these alloys, γ particles also increase the creep strength, although high volume fractions of γ particles decrease the hot workability substantially.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intergranular Carbides on Creep Strength in Nickel-Based Heat-Resistant Alloys

Ito¹,

Yamasaki

Mitsuhara

et al. 2017

Mater. Trans.

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Creep behaviors and microstructures for two Ni-based heat-resistant alloys with different carbon contents were investigated. The chemical compositions of the alloys were Ni-20Cr-15Co-6Mo-1Ti-2Al-2Nb-0.004 and 0.021C (mass%). The 0.004C and 0.021C alloys are referred to as the low-and high-C alloys, respectively. After solid-solution treatment at 1373 K for 1 h and isothermal annealing at 1023 K for 32 h, ne Ni 3 Al (γ ) particles were formed in the grain interior of both alloys. The average diameter and number density of γ particles were similar in both alloys. M 23 C 6 carbides were formed on grain boundaries after the isothermal annealing. Coverage ratios with the carbides in the high-C alloy were higher than that in the low-C alloys. Creep tests were performed at 1123 K and 130 MPa. The rupture time for the high-C alloy was longer than that for the low-C alloy, though both minimum creep rates were similar. In the high-C alloy, the creep strain was stored uniformly in the grain interior and the formation of a precipitate-free zone during the creep deformation was suppressed. Therefore, intergranular carbides with a high coverage ratio decreased the creep rate in the acceleration region.

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The Role of Eta Phase Formation on the Creep Strength and Ductility of INCONEL Alloy 740 at 1023 K (750 °C)

Cited by 95 publications

References 15 publications

Long-Term Creep-Rupture Behavior of Inconel® 740 and Haynes® 282

Long-Term Creep-Rupture Behavior of Inconel® 740 and Haynes® 282

Concentrating solar power (CSP) power cycle improvements through application of advanced materials

Effect of Intergranular Carbides on Creep Strength in Nickel-Based Heat-Resistant Alloys

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