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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Any convenient magnication that clearly reveals the graphite form may be used.
Summ Summary ary of Test Test Method 3. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Test Specimens Specimens or Samp Samples les 5. Size px x x x x Astk other units of measurement are included in this standard.
Thank you for interesting in our services. Material testing you can trust since Last previous edition approved in as A — 06 1. Summary of Test Method 3. Originally Originally approved in The percentages of each graphite type are estimated by observation, or better, by counting the aztm of each type. Types present in a sample are to be reported in percentages to total A number in paren parenthese thesess indicates the year of last reappr reapproval.
Characteristic features of graphite particles are designated by numerals and letters.
ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Some malleable irons may contain Types I or II graphite particles also. 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. Classication of Graphite Size by Chart 9. 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.
Wstm 3 Methods of Preparation of Metallographic Specimens2 3.
Characteristic features of graphite particles are designated by numerals and astj. Type, distribution, and size of observed graphite are compared with the idealized microstructures in the standard charts and rated accordingly as closely as possible to the equal or similar microstructures in the charts.
It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. ASTM A is a method of evaluating the microstructure of graphite in iron castings.
ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Nodule count, with known free carbon content, is adtm measure of calculated average nodule area. Please copy and paste this embed script to where you want to embed Embed Script. Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing.
Graphite distribution is designated by a capital letter A through E.
This method is only intended for the microstructure of graphite in iron castings. Link to Active This link will always route to the current Active version of the standard. The excess carbon in iron castings separates into graphite of various forms.
Iron castings with graphite flakes gray iron are not as strong or impact resistant as those with round nodular graphite ductile iron. Nodule count, with known free carbon content, is a measure of calculated average nodule area. Zstm standard asrm 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 astmm gray irons, malleable irons, and the ductile nodular irons. Current edition effective Aug. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Graphite atm is useful in predicting the strength and impact resistance of an iron casting 27 specific locations.
Report of Graphite Microstructure We are a non-profit group that run this website to share documents. ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting.
Report of Graphite Microstructure 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. Occasionally, however, graphite in malleable or ductile iron may occur in a nonrandom distribution pattern which the distributions B to E may be used to describe.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. It is a common practice in malleable xstm to use nodule count per unit area instead of a comparison chart as given here.