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An ASTM grain size determination is being made from a photomicrograph of a metal at a magnification of 1X. What is the ASTM grain size number of the metal if there are 992 grains per square mm?

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Fluid flow can affect solidification in a number of ways. For example, when a mold is full, filling defines the temperature distributions of the metal and mold. This sets up a residual flow that continues to distribute heat in the casting.

An ASTM grain size determination is being made from a photomicrograph of a metal at a magnification of 1X. What is the ASTM grain size number of the metal if there are 992 grains per square mm?






 
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