Neutron diffraction method for stored energy measurement in interstitial free steel

Rajmohan, N.; Hayakawa, Y.; Szpunar, Jerzy A.; Root, J.H.

doi:10.1016/s1359-6454(96)00371-0

Cited by 159 publications

(41 citation statements)

References 5 publications

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“…[2][3][4][5][6][7] Recent studies have shown that: I) the strong g-fiber texture is due to preferred nucleation 2,7) and II) such preferred nucleation is primarily caused by the stored energy advantage for g-fiber oriented deformed grains/bands. 2,[7][8][9] Interestingly enough, the nucleation advantage or the stored energy advantage did coincide with somewhat preferred appearance of grain interior strain localizations in deformed g-fiber oriented grains . 2,10) Conventional metallographic studies of deformed low carbon steels have often reported existence of grain interior "fish-bone" like structures [11][12][13] -the so-called grain interior strain localizations.…”

Section: Introductionmentioning

confidence: 92%

“…q/d values are expected to scale with stored energies of deformation. 1,9) Also included are standard deviations (SD) of estimated "q/d "s.…”

Section: Orientation and Substructurementioning

confidence: 99%

“…are: (I) higher stored energies of deformed g-fiber grains 2,3,[6][7][8][9] and (II) micro-growth advantage or selection of g-fiber recrystallized grains by virtue of a special high mobility boundary such as 25-35°͗110͘. 4,5,12) Direct experimental evidence 2,3,[6][7][8][9] for (I) seems to be convincing, although effectiveness of (II) is debated at times.…”

Section: Orientation and Substructurementioning

confidence: 99%

“…4,5,12) Direct experimental evidence 2,3,[6][7][8][9] for (I) seems to be convincing, although effectiveness of (II) is debated at times. 2,3,7) It seems, however, that both schools of opinion now consider presence of grain interior strain localizations as a 'requirement' for either of the mechanism(s).…”

Section: Orientation and Substructurementioning

confidence: 99%

“…2,3,7) It seems, however, that both schools of opinion now consider presence of grain interior strain localizations as a 'requirement' for either of the mechanism(s). 2,12) Bulk measurement techniques, 9,25,26) like X-ray and neutron diffraction, had repeatedly shown that Taylor factors, grossly representing orientation against a particular strain tensor as a single scalar quantity, 8) can be used as an index of stored energy in a polycrystalline material. Local orientation measurements had also shown 2,7,8,10,20,24,27) that deformed structure of individual grains and their relative stored energies usually depend on orientation and a generalized trend in Taylor factors.…”

Section: Orientation and Substructurementioning

confidence: 99%

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Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

2001

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Development of dislocation substructures was characterized in an aluminum killed deep drawing quality steel at four different plane strain deformations. At and above 20 % reduction, the most significant substructural feature was micro bands (MBs). MBs appeared as paired dislocation walls of 0.2-0.4 mm thickness and were always at an angle of approximately 37°with rolling direction (RD). As the traces of the MBs were more than 5°of {110} and {112}, closed packed planes of the bcc system,-they were termed as first generation 1) or non-crystallographic using the convention 16) commonly used in fcc metals. Other than the pre-deformation high angle boundaries, MBs were the only feature with large enough misorientations necessary for optical visibility. At least for the range of strain and strain path used in the present study, the first generation MBs can be considered as the so-called grain interior strain localizations. Relative presence and effectiveness of MBs were quantified in different microtexture components from the MB spacings along TD (l) and the average misorientation across MBs (q MB ) and these appear to determine the stored energies of different microtexture components.KEY WORDS: dislocation substructure; deep drawing quality steels; grain interior strain localizations; micro band; stored energy. Table 1. Chemical composition (in wt%) of aluminum killed DDQ steel used in the present study.

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Section: Introductionmentioning

confidence: 92%

“…q/d values are expected to scale with stored energies of deformation. 1,9) Also included are standard deviations (SD) of estimated "q/d "s.…”

Section: Orientation and Substructurementioning

confidence: 99%

Section: Orientation and Substructurementioning

confidence: 99%

Section: Orientation and Substructurementioning

confidence: 99%

Section: Orientation and Substructurementioning

confidence: 99%

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Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

2001

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135° Clock Rolling: An Approach to Improve the Microstructure and Texture of Tantalum Used for Sputtering Target

Fan¹,

Liu²,

Deng³

2016

TMS 2016: 145^thAnnual Meeting &Amp; Exhibition: Supplemental Proceedings

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Recrystallization and Texture in a Ferritic Stainless Steel: an EBSD Study

Sinclair¹,

Robaut

Maniguet

et al. 2003

Adv Eng Mater

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tron diffraction pattern stems from a significantly smaller volume than in the SEM. Additionally, dislocations are visible with the TEM and so localization of subgrains or cell structures is much easier.A TEM image of c-fibre orientations is shown in Figure 7. Subgrain structures are visible here too. However, in this case, the subgrains have a longitudinal shape and are separated by much sharper boundaries. The misorientations between neighboring subgrains are significantly higher as compared to the a-fibre structures. Values of about 1.5±6 were found. Obviously these structures can be resolved by the EBSD system because they show sharper boundaries and higher misorientations than a-fibre subgrains.This comparison of EBSD results with TEM observations shows that not all subgrain structures are clearly resolved by the EBSD system. In this context, it is very useful to take additional information into account. For example, images provided by a backscatter detector often show cell structures at places where an orientation map only shows continuous orientation gradients. This indicates that using both methods (EBSD + SEM with strong orientation contrast) in combination can prevent misinterpretation of EBSD data.The recrystallization behavior of laboratory-processed AISI409 ferritic stainless steel sheet has been studied with a focus on texture inhomogeneity and ªsluggishº recrystallization kinetics. This communication focuses primarily on observations made by electron backscatter diffraction (EBSD) in the scanning electron microscope (SEM). Pronounced texture gradients were observed in some grain orientations and correlated with the deformation-induced substructure. The strong pinning of some boundaries has been linked, not only to textural effects, but also to the precipitation of fine titanium carbonitrides.Tailoring the physical and mechanical properties of steels through careful engineering of microstructure and texture has been responsible for many of the recent developments in light-weight, high-strength, and highly formable alloys. Demands for further improvements in material properties require ever more sophisticated descriptions of microstructure evolution under complex processing paths. Widespread availability of new techniques, such as EBSD, are now being used to provide a fully quantitative link between microstructure, texture, and mechanical properties. Of the many properties that must be controlled via processing, optimization of formability continues to be a priority for ferritic steel producers. Control of plastic anisotropy via the bulk texture of the final product is crucial in this regard and consequently has been heavily studied, particularly for carbon steels. [1] While COMMUNICATIONS 570

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Neutron diffraction method for stored energy measurement in interstitial free steel

Cited by 159 publications

References 5 publications

Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

Development of Grain Interior Strain Localizations during Plane Strain Deformation of a Deep Drawing Quality Sheet Steel.

135° Clock Rolling: An Approach to Improve the Microstructure and Texture of Tantalum Used for Sputtering Target

Recrystallization and Texture in a Ferritic Stainless Steel: an EBSD Study

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