Testing and Analysis of Full-Scale Creep-Rupture Experiments on Inconel Alloy 740 Cold-Formed Tubing

Shingledecker, John; Pharr, George M.

doi:10.1007/s11665-012-0274-4

Cited by 30 publications

(10 citation statements)

References 16 publications

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“…Figure shows that the room temperature tensile properties of these alloys were relatively unaffected by these exposures. Alloy 740 likely “self‐aged” under these conditions (i.e., γ′ coarsening ) resulting in a consistently higher ultimate tensile strength and lower ductility, independent of environment. The ductility of E‐Brite increased with increasing pressure.…”

Section: Resultsmentioning

confidence: 99%

Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C

Pint

Brese

Keiser

2016

Materials & Corrosion

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Several power generation technologies have interest in employing a supercritical CO2 (sCO2) cycle but relatively little compatibility work has been conducted at the target pressure range of 200–300 bar, particularly at ≥700 °C. With the goal of utilizing lower pressure data sets (especially with controlled O2 and H2O contents), this initial assessment compared the effect of CO2 pressure at 1–300 bar on the compatibility of potential Fe‐ and Ni‐base structural alloys after 500 h exposures at 750 °C. For highly‐alloyed alumina‐ and chromia‐forming alloys, a minimal effect of pressure was observed on the mass change and reaction products, which were similar to those observed in 1 bar dry air, CO2, CO2–0.15%O2 and CO2–10%H2O. After these relatively short exposures, there was no obvious indication of internal carburization and the Cr depletion in the precipitation strengthened Ni‐base alloys (740 and 282) was minimal. In addition to coupons, 25 mm long tensile specimens of alloy 740, 247, 310HCbN, and E‐Brite (Fe–Cr) were exposed in each condition but did not show any detrimental effect of the high‐purity CO2 environments on room temperature tensile properties.

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Section: Resultsmentioning

confidence: 99%

Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C

Pint

Brese

Keiser

2016

Materials & Corrosion

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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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“…19 This leap in technology will require precipitation strengthened Ni-base alloys that have never been used in such applications. Relatively new alloys 740 20 and 282 21 are the current candidates but given the large steam tubing and piping requirements, even a small increase in high temperature properties or decrease in alloy cost 22 for a new alloy could result in a significant benefit for this application.…”

Section: Defining Requirementsmentioning

confidence: 99%

Critical Assessment 4: Challenges in developing high temperature materials

Pint

2014

Materials Science and Technology

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Materials are a key enabling feature for high efficiency engines for power generation or transportation. While significant research continues, progress in this century has certainly slowed compared to the previous century where modern materials science spawned a rapid advance in high temperature materials. One area that hampers new high temperature materials is a lack of inherent (i.e. uncoated) oxidation or environmental resistance, especially for the highest temperature applications such as Ni-base superalloys for turbomachinery. Thus, there appears to be more opportunity to develop materials for 600-1000uC applications than for higher temperatures. New materials requirements ranging from mechanical and environmental resistance to manufacturing and joining need to be clearly defined and experimental work focused on validating these properties for successful alloy development to proceed. For most applications the materials requirements have become so broad and complex that progress by single researchers is difficult. A teaming approach, especially among research institutions and industry, is needed to both define the critical needs and assemble experts in a range of disciplines to address these issues during the materials development process.

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Testing and Analysis of Full-Scale Creep-Rupture Experiments on Inconel Alloy 740 Cold-Formed Tubing

Cited by 30 publications

References 16 publications

Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C

Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C

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

Critical Assessment 4: Challenges in developing high temperature materials

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Testing and Analysis of Full-Scale Creep-Rupture Experiments on Inconel Alloy 740 Cold-Formed Tubing

Cited by 30 publications

References 16 publications

Effect of pressure on supercritical CO2 compatibility of structural alloys at 750 °C

Effect of pressure on supercritical CO2 compatibility of structural alloys at 750 °C

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

Critical Assessment 4: Challenges in developing high temperature materials

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Product

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Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C

Effect of pressure on supercritical CO₂ compatibility of structural alloys at 750 °C