MPISI: The neutron strain scanner materials probe for internal strain investigations at the SAFARI-1 research reactor

Venter, А.M.; Heerden, Phillipus R. van; Marais, Deon; Raaths, Johannes C.

doi:10.1016/j.physb.2017.12.011

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…The neutron diffraction measurements could therefore be performed without correcting for spurious strains due to partial gauge volume illumination. The residual strains were then measured at the MPISI [3] angular dispersive neutron strain scanner situated at the SAFARI-1 research reactor of Necsa. The average d -spacing values measured of each branch, were used as the d 0 (reference) values for the measurements.…”

Section: Methodsmentioning

confidence: 99%

Residual Stress Determination of Ductile Cast Iron by means of Neutron Diffraction

Smith¹

2018

Materials Research Proceedings

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A study was undertaken to simulate the casting process, using simulation software, of a ductile iron casting (for use as a valve body) and in doing so to determine the order of residual stress and experimentally verify the simulation results. The simulation was carried out using MAGMASOFT® and the residual stress results verified using neutron diffraction. The measured residual stress results were found to compare favourably with the simulation predictions.

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Section: Methodsmentioning

confidence: 99%

Residual Stress Determination of Ductile Cast Iron by means of Neutron Diffraction

Smith¹

2018

Materials Research Proceedings

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“…The residual strains were investigated in the erosion wear scar regions. While using the test protocols of MPISI instrument [45], the focus was to study the strain behaviours in the substrates by employing through-thickness fine measurement, and by doing so, the stress in the coating could be determined by imposing strain balance in the sample. While using the test protocols of KOWARI instrument [46], with diffracted beam slit at a width of 0.3 mm and positioning the gauge volume in the centre of the 200 µm thick coating, the strains were measured directly in the coatings [28].…”

Section: Strain Analysismentioning

confidence: 99%

Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers

et al. 2021

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Background During thermal spray coating, residual strain is formed within the coating and substrates due to thermo-mechanical processes and microstructural phase changes. Objective This paper provides a comprehensive guide to researchers planning to use neutron diffraction technique for thermal spray coatings, and reviews some of these studies. Methods ENGIN-X at the ISIS spallation source is a neutron diffractometer (time-of-flight) dedicated to materials science and engineering with high resolution testing. The focus is on the procedure of using ENGIN-X diffractometer for thermal spray coatings with a view that it can potentially be translated to other diffractometers. Results Number of studies involving neutron diffraction analysis in thermal spray coatings remain limited, partly due to limited number of such strain measurement facilities globally, and partly due to difficulty is applying neutron diffraction analysis to measure residual strain in the thermal spray coating microstructure. Conclusions This technique can provide a non-destructive through-thickness residual strain analysis in thermally sprayed components with a level of detail not normally achievable by other techniques. Neutron sources have been used to measure strains in thermal spray coatings, and here, we present examples where such coatings have been characterised at various neutron sources worldwide, to study residual strains and microstructures. Graphic Abstract

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“…The residual strains were investigated in the erosion wear scar regions. While using the test protocols of MPISI instrument [39], the focus was to study the strain behaviours in the substrates by employing through-thickness fine measurement, and by doing so, the stress in the coating could be determined by imposing strain balance in the sample. While using the test protocols of KOWARI instrument [40], with diffracted beam slit at a width of 0.3 mm and positioning the gauge volume in the centre of the 200 µm thick coating, the strains were measured directly in the coatings [38].…”

Section: Strain Analysismentioning

confidence: 99%

Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers

et al. 2020

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Background: During thermal spray coating, residual strain is formed within the coating and substrates due to thermo-mechanical processes and microstructural phase changes.Objective: This paper provides a comprehensive guide to researchers planning to use neutron diffraction technique for thermal spray coatings, and reviews some of these studies. Methods: ENGIN-X at the ISIS spallation source is a neutron diffractometer (time-of-flight) dedicated to materials science and engineering with high resolution testing. The focus is on the procedure of using ENGIN-X diffractometer for thermal spray coatings with a view that it can potentially be translated to other diffractometers.Results: Number of studies involving neutron diffraction analysis in thermal spray coatings remain limited, partly due to limited number of such strain measurement facilities globally, and partly due to difficulty is applying neutron diffraction analysis to measure residual strain in the thermal spray coating microstructure. Conclusions: This technique can provide a non-destructive through-thickness residual strain analysis in thermally sprayed components with a level of detail not normally achievable by other techniques. Neutron sources have been used to measure strains in thermal spray coatings, and here, we present examples where such coatings have been characterised at various neutron sources worldwide, to study residual strains and microstructures.

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MPISI: The neutron strain scanner materials probe for internal strain investigations at the SAFARI-1 research reactor

Cited by 11 publications

References 7 publications

Residual Stress Determination of Ductile Cast Iron by means of Neutron Diffraction

Residual Stress Determination of Ductile Cast Iron by means of Neutron Diffraction

Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers

Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers

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