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Which of the following types of indenter is employed in Brinell hardness test?

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Which of the following types of indenter is employed in Brinell hardness test?

(a) Diamond pyramid

(b) Diamond ball

(c) Titanium ball

(d) Steel ball

I got this question during an online interview.

I'd like to ask this question from Testing of Mechanical Properties in chapter Inspection Testing in Foundries of Casting-Forming-Welding I

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Correct option is (d) Steel ball

Explanation: In this test, a large steel ball of generally 10 mm diameter is used with a force of relatively large magnitude. This force is usually compatible with either 3000 kg for relatively hard materials such as cast iron and steel or 500 kg for soft materials such as aluminium and copper alloys. For very hard materials, a tungsten carbide ball is preferred.

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