Characterisation of Nimonic 90 by the use of miniaturised multiproperty mechanical and physical tests

Roebuck, B; Loveday, M S; Brooks, M.

doi:10.1016/j.ijfatigue.2007.01.055

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…As the grips are water-cooled, a parabolic temperature distribution will develop along the specimen. Previous studies [17,19] have shown that the peak temperature remains reasonably uniform (T = ± 5°C) in the central 2 to 3 mm of the sample at high temperatures between 500°C and 1000°C, with the size of this region decreasing with increasing temperature. A consequence is that the majority of plastic deformation is localized in this central region.…”

Section: B the Etmt Systemmentioning

confidence: 85%

“…This makes the design and implementation of the load string, and of small-scale specimens, grips, and extensometers, difficult. The ETMT system was developed at the National Physical Laboratory (NPL) with these concerns in mind and has been used successfully for the characterization of c 0 precipitate volume fraction, [14] recrystallization kinetics, [15] TMF, [16,17] flow stress, [4,[18][19][20] and creep strain evolution [21,22] in nickel-based superalloys.…”

Section: B the Etmt Systemmentioning

confidence: 99%

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On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

Sulzer

Alabort

Németh

et al. 2018

Metall Mater Trans A

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An electro-thermal mechanical testing (ETMT) system is used to assess the mechanical behavior of a prototype single-crystal superalloy suitable for industrial gas turbine applications. Miniaturized testpieces of a few mm 2 cross section are used, allowing relatively small volumes to be tested. Novel methods involving temperature ramping and stress relaxation are employed, with the quantitative data measured and then compared to conventional methods. Advantages and limitations of the ETMT system are identified; particularly for the rapid assessment of prototype alloys prior to scale-up to pilot-scale quantities, it is concluded that some significant benefits emerge.

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Section: B the Etmt Systemmentioning

confidence: 85%

Section: B the Etmt Systemmentioning

confidence: 99%

On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

Sulzer

Alabort

Németh

et al. 2018

Metall Mater Trans A

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“…An ETMT rig was developed at the National Physical Laboratories (NPL) to conduct tests with the ability to alter the load on specimen during testing, Figure 2(b). [13][14][15] Previous results from this type of testing showed that the change in resistance of a known volume of material (resistivity) was indicative of the internal microstructure of the specimen tested. [13][14][15][16] Load-control allows compensation for any change in specimen geometry, such as thermal expansion, during a test.…”

Section: Continuous-time Electrothermomechanical Test (Etmt) Rig Ementioning

confidence: 99%

“…[13][14][15] Previous results from this type of testing showed that the change in resistance of a known volume of material (resistivity) was indicative of the internal microstructure of the specimen tested. [13][14][15][16] Load-control allows compensation for any change in specimen geometry, such as thermal expansion, during a test. The rig is used with specimen sizes of 40 mm Â 5 mm Â 0.5 mm, heated at a rate of 50 Cs À1 in the central region to a chosen temperature to within 60.5…”

Section: Continuous-time Electrothermomechanical Test (Etmt) Rig Ementioning

confidence: 99%

The influence of temperature and grain boundary volume on the resistivity of nanocrystalline nickel

Darnbrough

Roebuck

Flewitt

2015

Journal of Applied Physics

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms The thermal stability and modes of recrystallisation of nanocrystalline nickel has been observed through a conduction-based non-destructive test. Resistivity measurements have been utilised to quantify grain boundary volume fraction and microstructure. This observation makes clear the distinction of the factors that contribute to resistivity and demonstrates that these contributions are related to microstructure, either directly or in-directly. In static systems, the contribution of ordered grains and low-order grain boundary atomic arrangements in small grained material has been measured and correlated with resistivity. Measurements of in-situ resistivity conducted at high temperature gives changes with time which are related to grain growth, during heat treatment. This shows that resistivity can be used as a technique for observing the microstructure and grain growth of small grained material. V C 2015 AIP Publishing LLC.

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“…Microscale uniaxial tests are not yet standardised, except for the specific requirements for testing foil materials given in ASTM E345-93, but have the potential to provide uniaxial stress-strain data that is representative of macro behaviour. It is important to be aware, however, of a number of metrological issues that can have a significant influence on the quality and accuracy of the results, 37,41,[56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] including: sample preparation; microstructural considerationsalignment; ductility; and resolution of load cells and transducers.…”

Section: Miniature Uniaxial Testsmentioning

confidence: 99%

25 year perspective Aspects of strain and strength measurement in miniaturised testing for engineering metals and ceramics

Lord

Roebuck

Morrell

2010

Materials Science and Technology

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Testing in the microregime is relevant to many technological issues, including, for example, evaluating the performance of established plant or new components through removal of small scale samples; assessing point to point variation in welded structures; characterising expensive advanced alloys that typically are only available in small quantities; and testing of subsized components. The use of miniature testpieces requires attention to the scale of the underlying microstructure relative to the overall testpiece dimensions, and presents challenges to the measurement of stress and strain in small volumes. The subject is extensive and the emphasis of the current paper is on a discussion of issues associated with the measurement of strength and strain, particularly with the latter assessed using non-contact optical techniques based on digital image correlation. The current article thus concentrates on the testing situation at the intermediate scale (in the range 0·5–5 mm) where testpieces are small compared with the size of engineering components and in the range where representative mechanical behaviour of the underlying microstructure must be considered. Metrology issues are addressed through specific case studies concerning; microuniaxial tests; small punch tests; subsized ceramic strength tests and the microindentation technique. Particular attention is paid to the uncertainties in measurement arising from the use of microscale tests to provide quantifiable levels of confidence in the ability of such tests to discriminate material behaviour.

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Characterisation of Nimonic 90 by the use of miniaturised multiproperty mechanical and physical tests

Cited by 9 publications

References 6 publications

On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

The influence of temperature and grain boundary volume on the resistivity of nanocrystalline nickel

25 year perspective Aspects of strain and strength measurement in miniaturised testing for engineering metals and ceramics

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