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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ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Replaces A — Characteristic features of graphite particles are designated by numerals and letters. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. A number in paren parenthese thesess indicates the year of last reappr reapproval.
Published Published April Test Specimens or Samples 5. Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching. Other microstructural details must be evaluated using different methods. 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.
The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type.
ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
This method is only intended for the microstructure of graphite in iron castings. Where a mixture of one or more sizes occurs in the same sample, the sizes may be reported as percentages of the total graphite area represented by the sizes involved.
If eutectiform graphite is present, the atsm might be VII D7. E 3 Methods of Preparation of Metallographic Specimens2 3. Thank you for interesting in our services.
A number in parentheses indicates the year of last reapproval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
If eutectiform graphite is present, the rating might be VII D7. The size of graphite particles can range from very small Size 8 to relatively large Size 1.
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. Originally Originally approved in A superscript epsilon e indicates an editorial change since the last revision or reapproval. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
When this is impractical, a test lug or projection often can be cast attached to the casting and sawed or broken off to be used as the sample.
Graphite distribution is designated by a capital letter A through E. Last previous edition approved in as A — 06 1. Classication of Graphite Distribution with Chart 8. Where a mixture of one or more sizes occurs in the same sample, the sizes may be reported as percentages of the total graphite area represented by the sizes involved. Jesus Talledo Bermudez Category: We need your help! ASTM A is a method of evaluating 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, compacted graphite irons, and the ductile nodular irons. Report of Graphite Microstructure Users of this standard are expressly advised awtm determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Some malleable irons may contain Types I or II graphite particles also. Asrm testing you can trust since Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type D or E.