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ASTM Grain Size Analysis

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ESTIMATE GRAIN SIZE IN METALS FOR FABRICATION

Metals are commonly used in various fields and products, from infrastructure facilities to buildings and electronic devices. Their types also vary widely; manufacturers must select appropriate materials according to the application and purpose. Therefore their grain size and properties are important as their grain properties can change due to heat treatment and other factors.

When a new grain is nucleated during processing (as in solidification or annealing after cold working), the atoms within each growing grain are lined up in a specific pattern that depends upon the crystal structure of the metal or alloy. To properly evaluate grain size in materials, our expert testing team will estimate the grain size number by visually comparing the metal structure sample magnified with a microscope against the standard diagram.

PTS performs grain size analysis that conforms to ASTM E112 on a wide range of metallic and non-metallic materials.

Metals are commonly used in a wide range of fields and products, from infrastructure facilities to buildings electronic devices.

Their types also vary widely and manufacturers need to select appropriate materials according to the application and purpose. Therefore their grain size and properties are important as their grain properties can change due to heat treatment and other factors.

When a new grain is nucleated during processing (as in solidification or annealing after cold working), the atoms within each growing grain are lined up in a specific pattern that depends upon the crystal structure of the metal or alloy.

The smaller the grains, the shorter the distance dislocations can move. Therefore it is desirable to use metal of the smallest average grain size which can be economically fabricated into the desired part.

Comparison Method

The comparison method allows for an efficient and relatively accurate evaluation of the grain size under a microscope against standardized charts, with +/- 1 grain size number of repeatability and reproducibility of ratings.

Planimetric Method

The planimetric method involves calculating the number of grains in a known area to determine the grain size level, with less than +/- 0.5 grain size units of repeatability and reproducibility of ratings.

APPLICATION OF ASTM GRAIN SIZE ANALYSIS:

Evaluate the heat treatment or manufacturing process on material

Correlate the mechanical properties with grain size of the material

Evaluate if the metallic material has mechanical properties

The larger the grain size number, the better mechanical properties the metallic material has

Common Test Methods

ASTM E112

ISO 643

Talk to us today

Our expert testing team analyses grain size in our state-of-the-art metallurgical lab with an accurate analysis.

For more information on our grain size analysis, call us or send us an enquiry today.

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Process #1
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Process #2
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Process #3
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Process #5
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