Mapping of Microscopic Strain Distributions in an Alloy 600 C-Ring After Application of Hoop Stresses and Stress Corrosion Cracking

McIntyre, N. S.; Ulaganathan, Jaganathan; Simpson, TC; Qin, Jun; Sherry, N.; Bauer, Michael; Carcea, Anatolie G.; Newman, R.C.; Kunz, Martin; Tamura, Nobumichi

doi:10.5006/1006

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…The pre‐treatment of the alloy preparation and the C‐ring geometry are described in reference . Laue microdiffraction mapping was performed on defined areas at the apices of the C‐rings using a polychromatic microscopic X‐ray beam of 1‐μm diameter at beamline 12.3.2 at the Advanced Light Source .…”

Section: Methodsmentioning

confidence: 99%

“…The tests were conducted in a 500‐ml nickel beaker (liner) containing 230 ml of solution inside an alloy‐625 autoclave. Prior to heating the autoclave, the caustic solution was deaerated by nitrogen for at least 12 h. Based on past experience, the duration of each exposure was between 12 and 24 h. Following each exposure, the sample microstructure was studied by SEM and was sectioned by a focused ion beam to obtain a better view of the grain structure and any crack formation.…”

Section: Methodsmentioning

confidence: 99%

“…Being diffracted by the material, they generate Laue diffraction patterns that describe the crystallographic distortions owing to strain of the unit cell of the stressed material. Already a number of microscopic Laue diffraction (MLD) studies of Alloy 600 and other austenitic alloys have been reported . While spatial resolution of EBSD mapping is usually better than that of MLD, EBSD sample surfaces must be carefully prepared to reduce artifacts owing to surface roughness; MLD samples, by contrast, usually require less preparation because the information depth sometimes extends to more than 10 microns, and contributions from the outermost surface are not as large.…”

Section: Introductionmentioning

confidence: 99%

“…Because of these factors, MLD is better suited to measuring differences between strain maps of materials before and after a mechanical or chemical change. Previously, MLD has been used to study the successive changes in strain patterns wrought by effects of accelerated corrosion on flat surfaces of rolled Alloy 600 . Such work has shown the importance of measuring differences between strain distributions before and after a corrosion experiment because virtually all polycrystalline materials have initial inherent strains whose contributions to the strain history of the material can only be known after successive applications of stress.…”

Section: Introductionmentioning

confidence: 99%

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Mapping of changes in microscopic strain in Alloy 600 during multi‐step applications of mechanical stress

Ulaganathan

Carcea

Newman

et al. 2017

Surface & Interface Analysis

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An Alloy 600 C-ring has been sequentially stressed as in a classical deformation test, and the apex of the C-ring has been spatially mapped by Laue microdiffraction during the stress deflection sequence. The diffraction spots were analyzed to provide maps showing the distributions of deviatoric elastic deformations as they changed with increased stress. The Laue-derived elastic strains in the stress direction, averaged over small areas at the C-ring apex responded to stress in a classic manner expected of a system undergoing elastic and then plastic deformation. For small amounts of applied stress, maps of the strain tensor in the stress direction (ε xx ) showed distributions that were reasonably homogeneous. As applied stress was increased to the elastic limit, distinct local pockets of the tensile strain tensor (ε xx ) became apparent. As stress approached a maximum deformation of 10 times the elastic limit, the strain tensor distribution underwent further changes. Von Mises elastic strains were also mapped and, in general, appeared to reduce as stress is increased. The formation and distribution of geometrically necessary dislocations were also monitored. After annealing at 315 C, the ε xx strain tensor values were diminished from most areas excepting those bordering some grain boundaries. Strain changes in stressed Alloy 600 C-rings were also studied following two brief stages of accelerated aqueous corrosion at 315 C. Localized ε xx strain tensor and von Mises strain values gradually diminished except for areas near grain boundaries.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mapping of changes in microscopic strain in Alloy 600 during multi‐step applications of mechanical stress

Ulaganathan

Carcea

Newman

et al. 2017

Surface & Interface Analysis

Self Cite

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“…On the other hand, exceeding a deformation of 40% defines the ductile behavior of the tested material [43]. Higher plastic strains were observed near grain boundaries after stressing because the boundaries acted as a barrier to dislocation motion by slip [45]. Stress corrosion cracks are usually investigated by optical micrographs, but they can be investigated by advanced methods, like polychromatic X-ray microdiffraction [46] or 3D electron backscatter diffraction [42].…”

Section: Introductionmentioning

confidence: 99%

Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests

Maier

Clausius

Wicke

et al. 2020

Metals

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This study focuses on the characterization of the failure behavior of an extruded Mg10Dy1Nd alloy during stress corrosion. The microstructure, hardness, strength and corrosion behavior of binary alloys Mg10Dy and Mg1Nd are compared to those of the ternary alloy system. The ternary alloy Mg-Dy-Nd that is not fully recrystallized has the highest hardness but lacks ductility. The investigated alloys twin during plastic deformation. Static C-ring tests in Ringer solution were used to evaluate the stress corrosion properties, and stress corrosion could not be found. None of the alloys failed by fracturing, but corrosion pits formed to various extents. These corrosion pits were elliptical in shape and located below the surface. Some of the pits reduced the remaining wall thickness significantly, but the stress increased by the notch effect did not lead to crack initiation. Furthermore, the C-ring specimen was subjected to compressive loading until fracture. Whereas the Mg1Nd alloy showed ductile behavior, the alloys containing Dy fractured on the tensile side. The crack initiation and growth were mainly influenced by the twin boundaries. The Mg10Dy1Nd alloy had an inhomogeneous microstructure and low ductility, which resulted in a lower fracture toughness than that of the Mg10Dy alloy. There were features that indicate hydrogen-assisted fracture. Although adding Nd decreased the fracture toughness, it reduced the grain size and had a positive influence on the corrosion rate during immersion testing.

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Unveiling fracture mechanics of a curved coating/substrate system by combined digital image correlation and numerical finite element analyses

Burden,

Harrell,

Bumgardner

et al. 2024

Engineering Fracture Mechanics

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Mapping of Microscopic Strain Distributions in an Alloy 600 C-Ring After Application of Hoop Stresses and Stress Corrosion Cracking

Cited by 5 publications

References 16 publications

Mapping of changes in microscopic strain in Alloy 600 during multi‐step applications of mechanical stress

Mapping of changes in microscopic strain in Alloy 600 during multi‐step applications of mechanical stress

Characterization of an Extruded Mg-Dy-Nd Alloy during Stress Corrosion with C-Ring Tests

Unveiling fracture mechanics of a curved coating/substrate system by combined digital image correlation and numerical finite element analyses

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