Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation

Sakanashi, Y.; Güngör, S.; Forsey, Alexander N.; Bouchard, P. J.

doi:10.1007/s11340-016-0245-z

Cited by 22 publications

(21 citation statements)

References 21 publications

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“…Future work utilising the full-field capabilities of DIC opens the possibility of measuring multiple creep curves at multiple stresses using a specialised geometry during traditional creep testing at constant temperature [15]. This will allow comparative damage identification from ex-service material across different deformation mechanism regimes through the more convenient calculation of stress exponents and threshold stresses from a single sample.…”

Section: Discussionmentioning

confidence: 99%

“…Spatial resolution for DIC is determined by the size of interrogation windows (or subsets) that make up the Region of Interest (ROI) and they are usually in the order of 10–100 pixels [14]. Sakanashi et al [15] extended the use of DIC to measure creep deformation spatially across a stainless steel weldment. In the authors’ previous work, DIC was successfully used to measure tensile properties of X20 at several elevated temperatures from a single sample that was subjected to a thermal gradient while using resistive heating in a thermomechanical simulator [16].…”

Section: Introductionmentioning

confidence: 99%

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Creep Damage Assessment of Ex-Service 12% Cr Power Plant Steel Using Digital Image Correlation and Quantitative Microstructural Evaluation

et al. 2019

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The lifetime of steam pipelines in long-term operation in coal-fired power plants are limited due to material damage that resulted from creep exposure. In the present study, the authors comparatively assess the damage of ex-service 12% Cr piping steel with varying degrees of exposure while using accelerated creep tests that employ digital image correlation (DIC) as well as microstructural investigation that is based on electron microscopy. The DIC technique, which allows multiple creep curves to be measured at temperatures ranging from 550–600 °C from a single specimen, revealed higher Zener–Hollomon parameters for a high damage material with a high void density when compared to a material with lower damage and lower void density. Both of the material states showed similar hardness values, subgrain sizes, and boundary character, despite the difference in void densities. Slightly higher inter-particle spacing of MX precipitates results in a lower threshold stress of 79 MPa for the high damage steel when compared to 97 MPa for the low damage material. Besides large Laves phase particles (>0.2 µm) that are found in the higher damaged materials that result in solid solution depletion, the most prominent microstructural damage indicator was a lower density of M23C6 precipitates. Therefore, the observations indicate that the Zener–Hollomon parameter and M23C6 particles are good damage assessment indicators between the most extreme damage states and they predict a lower damage level for a medium void density material.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Creep Damage Assessment of Ex-Service 12% Cr Power Plant Steel Using Digital Image Correlation and Quantitative Microstructural Evaluation

et al. 2019

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“…The spatial resolution of DIC is determined by the camera setup, speckle detail, and subset size settings, making it possible to collect a higher density of deformation data over the same footprint of conventional extensometry and strain gauges. 15,16 Literature presents few examples of application of DIC to creep deformation measurement. Narayanan et al 17 measured creep strain at 700°C of notched Inconel 617 samples using DIC together with linear variable differential transducers (LVDTs).…”

Section: Introductionmentioning

confidence: 99%

Measurement of creep deformation of ex-service 12% Cr steel using digital image correlation

Rooyen

Becker

Westraadt

et al. 2020

The Journal of Strain Analysis for Engineering Design

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The effective operation of ageing coal-fired power plants requires routine damage assessment of critical component materials throughout their service history. Traditional post-exposure mechanical testing typically requires large amounts of material for each testing condition. This study introduces an accelerated (high stress and temperature) creep testing technique that employs digital image correlation for strain measurement over a non-uniform temperature field generated by a thermomechanical tester. When applied to different ex-service (exposed to service conditions within a power plant) 12% Cr piping steels, multiple accelerated creep curves at temperatures ranging from 550°C to 600°C are measured from a single specimen for each material condition. Higher creep damage in the steel due to longer service exposure and higher void densities is revealed by shorter rupture times, faster creep rates and tertiary-dominated creep curves when compared to the lower creep damage state. Microstructural study via quantitative electron microscopy confirms the dislocation creep-driven growth of subgrains in the specimen gauge regions relative to the grips. Larger subgrains and a weakening of precipitate distributions for the high damage material were also noted. Digital image correlation–measured strains are in good agreement with traditional techniques of creep testing with standard extensometry. On a comparative basis, the technique is shown to be a plausible form of damage assessment of 12% Cr piping steels with varying levels of service exposure and serve as a suitable mechanical complement to the traditional void replica methodology.

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“…The CCDC is also used to investigate the mechanical response of welded joints, concrete members and structural members at ambient temperature and elevated temperature respectively [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Application of the Non-Contact Video Gauge on the Mechanical Properties Test for Steel Cable at Elevated Temperature

Gou

2019

Applied Sciences

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As the limit of traditional contact measurement, it is difficult to precisely measure the steel cables twisted by a branch of wires especially at elevated temperature. In this paper the strain-stress relationships of S355 and S690 structural steel, 1860 MPa steel cable twisted by seven wires have been measured by the strain gauge, extensometer and non-contact video gauge at ambient temperature and elevated temperature, respectively. Comparison of the stress-strain curves gotten by different measuring technology, it indicates that the non-contact video gauge can provide a more efficient and reliable database than the strain gauge as well as extensometer, especially at an elevated temperature. It is worth noting that the non-contact video gauge can capture not only the full range of stress-strain curves of steel cables, but is also efficient for the specimens with a complex shape.

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Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation

Cited by 22 publications

References 21 publications

Creep Damage Assessment of Ex-Service 12% Cr Power Plant Steel Using Digital Image Correlation and Quantitative Microstructural Evaluation

Creep Damage Assessment of Ex-Service 12% Cr Power Plant Steel Using Digital Image Correlation and Quantitative Microstructural Evaluation

Measurement of creep deformation of ex-service 12% Cr steel using digital image correlation

Application of the Non-Contact Video Gauge on the Mechanical Properties Test for Steel Cable at Elevated Temperature

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