ASTM A247 PDF

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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. The tips of the flakes act as preexisting notches at which stresses concentrate and it therefore behaves in a brittle manner. Grey iron also has very good damping capacity and hence it is often used as the base for machine tool mountings.

Class 20 has a high carbon equivalent and a ferrite matrix. Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. Gray iron above class 40 requires alloying to provide solid solution strengthening , and heat treating is used to modify the matrix. Class 80 is the highest class available, but it is extremely brittle. These grades are a measure of the tensile strength-to- Brinell hardness ratio.

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ASTM A247 – 鉄鋳物中の黒鉛の微細構造を評価するための標準試験方法

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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