Large Aluminum Cold Forged Pin Fin Radiator

　　Hardness Testing Standards for Aluminum Die - Castings

　　Hardness testing is an important quality - control measure for aluminum die - castings, as it provides valuable information about the material's mechanical properties and its suitability for various applications. There are several widely used hardness testing standards for aluminum die - castings. One of the most common is the Rockwell hardness test. In the Rockwell hardness test, a diamond indenter or a hardened steel ball is pressed into the surface of the casting under a specified load. The depth of penetration is then measured, and the Rockwell hardness number is calculated based on this depth. Different scales, such as the B - scale (using a 1/16 - inch diameter steel ball indenter) and the F - scale (using a 1/16 - inch diameter steel ball indenter with a lower major load), are used depending on the hardness range of the aluminum alloy.

　　The Brinell hardness test is another popular method. In this test, a hardened steel or tungsten carbide ball is pressed into the casting surface under a fixed load for a specified time. The diameter of the resulting indentation is measured, and the Brinell hardness number is calculated based on the load and the indentation diameter. The Brinell hardness test is suitable for measuring the hardness of relatively soft aluminum alloys and provides a more average hardness value over a larger surface area.

　　The Vickers hardness test is also frequently used, especially for measuring the hardness of small or thin - walled aluminum die - castings. In the Vickers hardness test, a diamond pyramid - shaped indenter is used. The indenter is pressed into the casting surface under a specific load, and the diagonal lengths of the resulting indentation are measured. The Vickers hardness number is calculated based on the load and the area of the indentation. This test offers high accuracy and is suitable for measuring the hardness of different micro - structures within the casting.

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