ASTM A Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings. ASTM A ISO R classification of graphite flake size and shape. ❑ The properties of grey iron castings are influenced by the shape and distribution of the. Designation: A – 67 (Reapproved ) Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings1.
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No other units of measurement asym included in this standard. Some malleable irons may contain Types I or II graphite particles also. Summary of Test Method 3. Please copy and paste this embed script to where you want to embed Embed Script.
We need your help! ASTM B r ASTM A provides images used to classify the form, ast, and size of the graphite in an iron casting.
ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Test Specimens Specimens or Samp Samples les 5. One section 1 x 1 x 0. Characteristic features of graphite particles are asstm by numerals and letters. Permission rights to photocopy the standard may also be secured from the ASTM website www.
It does not indicate, except in a very broad way, the origin of the graphite or the suitability of the iron-carbon alloy atsm a particular service. Jesus Talledo Bermudez Category: Originally Originally approved in Referenc Referenced ed Documents Documents 2.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray irons, malleable irons, and the ductile nodular irons.
Size px x x x x It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. At exactly diameters magnication the maximum dimension of the graphite particles for the various size asgm are shown in Table 1. Historical Version s – view previous versions of standard. The percentages of each graphite asm are estimated by observation, or better, by counting the particles of each type.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. Types present in a sample are to be reported in percentages to total If eutectiform graphite is present, the rating might be VII D7.
This standard has been approved for use by agencies of the Department of Defense. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray irons, malleable irons, compacted graphite irons, and the ductile nodular irons. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Characteristic features of graphite particles are designated by numerals and letters. Use of diamond powder polishing compound in one of the nal stages of polishing is very effective in retaining the graphite at the polished surface.
Advanced Plastic and Material Testing, Inc. However, the microstructure is typically evaluated by the percentage of Types I and II that are commonly observed. Last previous edition approved in as A — 06 1. Graphite distribution is designated by a capital letter A through E.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
Signicance and Use 4. High magnification optical microscopy is required to reveal important details.
The excess carbon in iron castings separates into graphite of various forms. Report of Graphite Microstructure Replaces A — Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. Nodule count, with known free carbon content, is a measure of calculated average nodule area.
Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching.
ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Other microstructural details must be evaluated using different methods. Nodule count, with known free carbon content, is a measure of calculated average nodule area. Test Specimens or Samples 5.
Classication of Graphite Form with Chart 7. When this is impractical, a test lug or projection often can be cast attached to the casting and sawed or aztm off to be used as the sample.
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