銅溶浸焼結鉄の耐衝撃特性

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  • Impact Properties of Copper-Infiltrated Sintered Iron
  • ドウ ヨウシンショウケツテツ ノ タイショウゲキ トクセイ

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This study was undertaken to examin the influence of pore filling with copper, that of an alloying reaction between iron and copper, and that of nonmetallic inclusion, on the impact properties of copper-infiltrated sintered iron.<BR>Skeletons with the density of 6.5 g/cm3 were prepared from electrolytic (HVA-star) and reduced-ore (NC100⋅24) iron powders by means of compacting at room temperature and sintering for 1 hr at 1200°C in hydrogen. Subsequently they were infiltrated with copper powder compacts, containing 5% of iron powder, for 5/3-135 min at 1130°C in hydrogen.<BR>Results were summarized as follows:<BR>Filling pore with copper remarkably increased the impact strength.<BR>As the infiltrating time increased, the amount of iron alloy containing copper increased, and necks of iron skeletons were gradually cut off, which led to the increase in tensile strength and the decrease in impact strength and elongation.<BR>The transition from ductile to brittle appeared around room temperature. This transition temperature was not apparently changed with the properties of iron powders used for skeletons, but slightly increased with infiltrating time.<BR>The impact strength of copper-infiltrated iron compacts made from reduced-ore powder was much lower than that of the compacts from electrolytic, largely due to its higher content of nonmetallic inclusions.

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