Standard Practice for X-Ray Determination of Retained Austenite in Steel with Near Random Crystallographic Orientation (Withdrawn 2022)

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03-07-2013

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American Society for Testing and Materials

CONTAINED IN VOL. 03.01, 2015 Describes the determination of retained austenite phase in steel using integrated intensities (area under peak above background) of X-ray diffraction peaks using chromium K[alpha] or molybdenum K[alpha] X-radiation.

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 K_α or molybdenum K_α X-radiation.

1.2The method applies to carbon and alloy steels with near random crystallographic orientations of both ferrite and austenite phases.

1.3This practice is valid for retained austenite contents from 1 % by volume and above.

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.

TABLE 1 Calculated Theoretical Intensities Using Chromium K_α Radiation^A

hkl	Sinθ/λ	θ	f	Δf′	Δf"	/F/²	LP	P	T^B	N²	R
(α iron, body-centered cubic, unit-cell dimension a_o = 2.8664Å):
110	0.24669	34.41	18.474	−1.6	0.9	1142.2	4.290	12	0.9577	0.001803^B	101.5^C
200	0.34887	53.06	15.218	−1.6	0.9	745.0	2.805	6	0.9172	0.001803^B	20.73^C
211	0.42728	78.20	13.133	−1.6	0.8	534.6	9.388	24	0.8784	0.001803^B	190.8^C
(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	0.0004594^B	75.24^C
200	0.27778	39.52	17.422	−1.6	0.9	4018.3	3.317	6	0.9467	0.0004594^B	34.78^C
220	0.39284	64.15	14.004	−1.6	0.8	2472.0	3.920	12	0.8962	0.0004594^B	47.88^C

^A Data from “International Tables for X-Ray Crystallography,” Physical and Chemical Tables , Vol III, Kynoch Press, Birmingham, England, 1962, pp. 60, 61, 210, 213; Weighted K_α1 and K_α2 value used (λ = 2.29092Å).

^B Temperature factor (T = e^−2M) where M = B(sin²θ)/λ² and 2B = 0.71. Also N is the reciprocal of the unit-cell volume.

^C Calculated intensity includes the variables listed that change with X-ray diffraction peak position.

Committee	E 04
DocumentType	Redline
Pages	9
PublisherName	American Society for Testing and Materials
Status	Current

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