ASTM E1268 PDF

ASTM E1268 PDF

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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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 mm2 0.

The experimental hardenability data lists an as-quenched hardness of 58 HRC for steels with carbon contents from 0. Solid-state transformations may be inuenced by the resulting microsegregation pattern leading to development of a layered or banded microstructure.

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.

ASTM E 1268 2001(Reapproved 2016) Ferrite Banding Standard

Sampling and Test Specimens 7. The mean free path spacing, l’, is calculated in accordance with: The above equation is simple to use with a pocket calculator.

The test grid is placed over the image projected onto the digitizing tablet and a cursor is used for counting. Etching must produce strong contrast between the phases or constituents of interest. Sampling and Test Specimens 7. For isolated particles in a matrix, the number of feature intersections will equal twice the number of feature interceptions.

Nwith the test lines in the same way as described in The stereological methods may also be used to characterize non-banded microstructures with second phase constituents oriented elongated in varying degrees in the deformation direction.

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Linear regression for this portion of the conversion reveals the following relationship: Last previous edition E — The anisotropy index for a randomly oriented, zstm microstructure is one.

Measurements are made with the test lines parallel and perpendicular to the deformation direction. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

The correlation coefficient is 0.

ASTM E (Reapproved ) Ferrite Banding Standard – PDF Free Download

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. These conversions are for Knoop loads of gf or greater. This requires a measurement of the volume fraction, VV, of the banded or oriented phase constituent by point counting see Practice E or other suitable methods.

Table 1 provides rules for counting while Fig. This difference requires pattern recognition techniques which are beyond the scope of this method. The most common example of banding is the layered ferrite-pearlite structure of wrought low-carbon and low-carbon alloy steels. 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.

This problem occurs most commonly in NL and PL measurements in highly banded structures. The Knoop indenter is particularly well suited for this work. The grid should be placed without operator bias. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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ASTM E1268 – 01(2016)

This method is applicable only to steels with carbon contents from 0. Either NL or PL, or both see Your consent to our cookies if you continue to use this website.

E — 01 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures1 This standard is issued under the xed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. Other examples of banding include carbide banding in hypereutectoid tool steels and marten mar tensite site ban bandin ding g in hea heat-t t-trea reated ted allo alloy y stee steels.

Because the degree of banding or orientation may vary through the product cross section, the test plane should sample the entire cross section.

NOTE 3—If the difference in Knoop hardness between the bands is not large, the statistical signicance of the difference can be determined using the t-test as described in most statistics textbooks. The grid used for these measurements consisted of eight parallel lines, spaced 20 mm 0. Both the matrix and the segregates must be fully martensitic except for normal minor amounts of retained austenite and in the as-quenched condition. The difference between the mean spacing and the mean free path provides an estimate of the mean width of the banded or oriented phase or constituent.

Sco Scope pe 1. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.