ASTM E 975 : 2013
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Standard Practice for X-Ray Determination of Retained Austenite in Steel with Near Random Crystallographic Orientation (Withdrawn 2022)
Hardcopy , PDF
03-16-2023
English
03-07-2013
1.1This practice covers the determination of retained austenite phase in steel using integrated intensities (area under peak above background) of X-ray diffraction peaks using chromium Kα or molybdenum Kα X-radiation.
1.2The method applies to carbon and alloy steels with near random crystallographic orientations of both ferrite and austenite phases.
1.4If possible, X-ray diffraction peak interference from other crystalline phases such as carbides should be eliminated from the ferrite and austenite peak intensities.
1.5Substantial alloy contents in steel cause some change in peak intensities which have not been considered in this method. Application of this method to steels with total alloy contents exceeding 15 weight % should be done with care. If necessary, the users can calculate the theoretical correction factors to account for changes in volume of the unit cells for austenite and ferrite resulting from variations in chemical composition.
1.6Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.7This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.
hkl | Sinθ/λ | θ | f | Δf′ | Δf" | /F/2 | LP | P | TB | N2 | R |
(α iron, body-centered cubic, unit-cell dimension ao = 2.8664Å): | |||||||||||
110 | 0.24669 | 34.41 | 18.474 | −1.6 | 0.9 | 1142.2 | 4.290 | 12 | 0.9577 | 0.001803B | 101.5C |
200 | 0.34887 | 53.06 | 15.218 | −1.6 | 0.9 | 745.0 | 2.805 | 6 | 0.9172 | 0.001803B | 20.73C |
211 | 0.42728 | 78.20 | 13.133 | −1.6 | 0.8 | 534.6 | 9.388 | 24 | 0.8784 | 0.001803B | 190.8C |
(γ iron, face-centered cubic, unit-cell dimension a o = 3.60Å): | |||||||||||
111 | 0.24056 | 33.44 | 18.687 | −1.6 | 0.9 | 4684.4 | 4.554 | 8 | 0.9597 | 0.0004594B | 75.24C |
200 | 0.27778 | 39.52 | 17.422 | −1.6 | 0.9 | 4018.3 | 3.317 | 6 | 0.9467 | 0.0004594B | 34.78C |
220 | 0.39284 | 64.15 | 14.004 | −1.6 | 0.8 | 2472.0 | 3.920 | 12 | 0.8962 | 0.0004594B | 47.88C |
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