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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Current Curre nt editio edition n appro approved ved March 1, Signicance and Asrm 4. Types present in a sample are to be reported in percentages to total Some malleable irons may contain Types I or II graphite particles also.
This method is only intended for the microstructure of graphite in iron castings.
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.
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ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching. 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.
Permission rights to photocopy the standard may satm be secured from the ASTM website www. Sco Scope pe 1. Graphite size is designated by an Arabic numeral 1 through 8. If eutectiform graphite is present, the rating might be VII D7.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Other microstructural details must be evaluated using different methods. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type.
Originally Originally approved in Current edition effective Aug. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. No other units of measurement are included in this standard. ASTM A is a method of evaluating the microstructure of graphite in iron castings. A number in parentheses indicates the year of last reapproval.
When this is impractical, a test lug or projection sstm can be cast attached to the casting and sawed astj broken off to be used as the sample. High magnification optical microscopy is required to reveal important details. Characteristic features of graphite particles are designated asfm numerals and letters.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
One section 1 x 1 x 0. However, the microstructure is typically evaluated by the percentage of Types I and II that are commonly observed.
Referenc Referenced ed Documents Documents 2. Size px x x x x Work Item s – proposed revisions of this standard.
Classication of Graphite Form with Chart 7. Test Specimens Specimens or Samp Samples les 5. Use of diamond powder polishing compound in one of the nal stages of polishing is very effective in qstm the graphite at the polished surface.
This standard has been approved for use by agencies of the Department of Defense.
Iron castings with graphite flakes gray iron are not as strong or impact resistant as those with round nodular graphite ductile iron. This standard is subject to revision at any time by the responsible astk committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
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