Hardness test of porous metals by a spherical indenter.

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  • 球形圧子による多孔質金属の押込み硬さ試験
  • キュウケイ アッシ ニ ヨル タコウシツ キンゾク ノ オシコミカタサ シケン

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Abstract

The relationship between the Brinell hardness HB and the flow stress σε of sintered porous metals is examined considering the ratio d/D ; the diameter of indentation to that of the indenter. When d/D=0.4, at which the Brinell hardness test is usually done, the ratio c=HB/σε varies from 2 to 3 with a relative density ρ of 0.70 to 0.97. However, when d/D=0.7 to 0.9, the ratio c is almost constant at 2.5 to 2.8 without influence of the relative density. Therefore, the flow stress of porous metals can be estimated from the Brinell hardness test at a ratio d/D of 0.7 to 0.9.

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