Angles of Indenter in Hardness Test of Sintered Metals

概要

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Indentation of sintered metals with square-based pyramids is performed and the relationship between the hardness and the compressive flow stress of the sintered metals in obtained. When the semi-angle α of the pyramid is 68°, which corresponds to the semi-angle of a Vickers hardness indenter, the ratio of the hardness to the flow stress is dependent upon the relative density. However, when α is 45°, the ratio is a constant value of 2.7 without influence of the relative density. Therefore, the flow stress of the sintered metals can be estimated from the hardness measured by using the indenter with the semi-angle of 45°.
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