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Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type D astmm E. The excess carbon in iron castings separates into graphite of various forms.
This standard is also available to be included in Standards Subscriptions. ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting.
This method is only intended for the microstructure of graphite in iron castings. Iron castings with graphite flakes gray iron are not as strong or impact resistant as those with round nodular graphite ductile iron. Already Subscribed to this document.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. High magnification optical microscopy is required to reveal important details.
Subscription pricing is determined by: Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Standards Subsctiption may be the perfect solution. It is the responsibility of the user of this astmm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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. Please first verify your email before subscribing to alerts. 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 define concisely the graphite microstructure required.
Proceed to Checkout Continue Shopping. Add to Alert PDF. No other units of measurement are included in this standard. Asm first log in with a verified email before subscribing to alerts. Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing.
Historical Version s — view previous versions of standard. Link to Active This link will always route to the current Active version of the standard. Material testing you can trust since Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Work Item s — proposed revisions of this standard. We have no amendments or corrections for this standard.
If the document is revised or amended, you will be notified by email. Subscription pricing is determined by: You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Need more than one copy? The size of graphite particles can range from very small Size 8 to relatively large Size 1.
As the voice of the U. 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. 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 ast.
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Structure[ edit ] A typical chemical composition to obtain a graphitic microstructure is 2. Another factor affecting graphitization is the solidification rate; the slower the rate, the greater the time for the carbon to diffuse and accumulate into graphite. A moderate cooling rate forms a more pearlitic matrix, while a fast cooling rate forms a more ferritic matrix. To achieve a fully ferritic matrix the alloy must be annealed. In two dimensions, as a polished surface, the graphite flakes appear as fine lines. The graphite has no appreciable strength, so they can be treated as voids.
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