4600系焼結鍛造材の機械的性質に与える出発原料―混合粉と合金粉―の影響

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  • Effects of Starting Raw Materials, Admixed and Alloyed Powder, on the Mechanical Properties of 4600 Sinter-forged Steels
  • 4600ケイ ショウケツ タンゾウザイ ノ キカイテキ セイシツ ニ アタエル

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The relation between the static and dynamic properties and homogenization aspect of added elements (Ni, Mo) in the sinter-forged 95-100% dense steels contained 0.2-0.5%C was investigated.<BR>The results obtained are as follows;<BR>1) Mechanical properties of full dense materials made from the alloyed powder are the most excellent, while in the case of the material made from the admixed powder, mechanical properties are inferior because Mo does not sufficiently diffuse into the matrix, and brittle intermetallic compounds are formed near the interface of the matrix and Mo particles.<BR>2) In the material which contains the ferro-molybdenum powder instead of the metallic molybdenum pow-der, static properties are improved but dynamic ones show no sign of improvement at all owing to brittle intermetallic compounds scattered in the matrix.<BR>3) In the case of the materials with residual pores, however, the difference of the dynamic properties between the materials made from the alloyed and the admixed powder extremely decreases, and at 97% density ratio there is little difference in both static and dynamic properties.

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