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If there are approximately 25 grains on a 4x6 inch micrograph with a magnification of 100x, what is the ASTM grain size?

Answer :

Final answer:

To determine the ASTM grain size, calculate the average grain size using the given information and refer to an ASTM grain size chart.

Explanation:

The ASTM grain size refers to the size of the grains in a metal sample. To determine the ASTM grain size, we can calculate the average grain size using the given information. The micrograph size is 4x6 inches, which corresponds to an area of 24 square inches. Since there are around 25 grains in this area, the average grain size is approximately 24/25 square inches. To determine the ASTM grain size, we need to refer to a ASTM grain size chart that relates the grain size number to the grain area.

Based on the given information, we can calculate the average grain area as follows:

  1. Calculate the total area of the micrograph: 4 inches * 6 inches = 24 square inches.
  2. Calculate the average grain area: 24 square inches / 25 grains = 0.96 square inches per grain.

Using the ASTM grain size chart, we can determine the corresponding ASTM grain size number based on the average grain area of 0.96 square inches. Each ASTM grain size number represents a specific grain area range, and the chart provides the corresponding number for the given average grain area. The student can refer to the ASTM grain size chart to find the exact ASTM grain size number for an average grain area of 0.96 square inches per grain.

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