Automated image analysis software for assessing banding or orientation of Microstructures in dual phase steel. For Annual Book of ASTM approved in Last previous edition approved in as E – 01(). Standards volume information, refer to the standard’s . ASTM E_ – Designation: E – 01 Standard Practice for Assessing the Degree of Bandin.
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This difference requires pattern recognition techniques which are beyond the scope of this method. Examination at higher magnication may be required to identify and classify the constituents present.
ASTM E (Reapproved ) Ferrite Banding Standard – PDF Free Download
The grid used for these measurements consisted of eight parallel lines, spaced 20 mm 0. Link to Active This link will always route to the current Active version of the awtm.
The anisotropy index for a randomly oriented, non-banded microstructure is one. Originally published as E — N Interceptions—Count the number of individual particles, grains, or patches of the constituent of interest crossed by the grid lines. Summary of Practice 4.
It is best if the etchant used does not reveal grain boundaries within a given phase. Alternatively, both phases may be aligned with neither appearing as a matrix phase. The appearance of the orientation or banding is inuenced by processing factors such as the solidication rate, the extent of segregation, the degree of hot or cold working, the nature of the deformation process used, the heat treatments, and so forth.
ASTM E1268 – 01(2016)
Calculate the number of boundary intersections per unit length perpendicular to the deformation axis, PL’, in accordance with: Do not deliberately orient the grid lines over any particular microstructural feature or w1268.
The accuracy of this conversion will become poorer as the test load decreases below gf. A number in paren parenthese thesess indicates the year of last reappr reapproval. The equations given axtm Annex A2 may be helpful for such conversions. Precision and Bias If the product form is too large to permit preparation of full cross sections, the samples prepared at the desired locations should have a minimum polished surface area of mm 2 0. The grid should be placed without operator bias.
The length of full cross-section samples, in the deformation direction, should be at least 10 mm 0. For a two-phase structure, count all of the interceptions of the phase of interest, that is, those that are clearly part of the bands and those that are not. Generally, it is best to count the banded phase present in least amount.
The number and location of such test specimens should be dened by producer-purchaser agreement. If a line ends within a particle, patch or grain, count it as one half an interception. Test Methods E list appropriate etchants for most metals and alloys.
Pub Publis lished hed Apr April il Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Both the matrix and the segregates must be fully martensitic except for normal minor amounts of retained austenite and in the as-quenched condition. These conversions are for Knoop loads of gf or greater.