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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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. A number in paren parenthese thesess indicates the year of last reappr reapproval.
Summ Summary ary of Test Test Method 3.
Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type D or E. 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. This method is only intended for the microstructure of graphite in iron castings.
Types present in a sample are to be reported in percentages to total ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting. Please help us to share our service with your friends. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. Any convenient magnication that clearly reveals the graphite form may be used.
One section 1 x 1 x 0. If eutectiform graphite is present, the rating might be VII D7. We are a non-profit group that run this website to share documents. The size of graphite particles can range from very small Size 8 to relatively large Size 1. 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.
High magnification optical microscopy is required to reveal important details.
ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Referenc Referenced ed Documents Documents 2. Signicance and Use 4. If eutectiform graphite is present, the rating might be VII D7. A 2477 epsilon e indicates an editorial change since the last revision or reapproval.
Thank you for interesting in our services. Current edition effective Aug. Nodule count, with known free carbon content, is a measure of calculated average nodule area.
The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. Originally Originally approved in Summary of Test Method 3.
ASTM B r 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 has been approved for use by agencies of the Department of Defense.
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. In an appropriate specification for a specific material where graphite microstructure is an important consideration, this test method may be used as a reference to concisely define the graphite microstructure required. Users of astn standard are expressly advised that determination astj the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Graphite distribution is designated by a capital letter A through E.